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- •Preface
- •Contents
- •Contributors
- •Bone Circulation
- •Embryology
- •Postnatal Development
- •Bone Tissue
- •Bone Organization
- •Bone Metabolism
- •Bone Growth Factors
- •Cartilage
- •Metabolic Bone Disease
- •Eucalcemic States: Osteoporosis
- •Hypercalcemic States: Hyperparathyroidism
- •Renal Osteodystrophy
- •Sick Cell Syndromes
- •Osteogenesis Imperfecta
- •Osteopetrosis
- •Paget’s Disease
- •Arthritis
- •Metabolic Arthritides: Crystalline Arthropathy
- •Gout
- •Pseudogout
- •Ochronosis
- •Vascular Disease
- •Circulatory Disease: Avascular Necrosis
- •Hematologic Syndromes
- •Neurodevelopmental Disorders
- •Neurologic Diseases
- •Developmental/Congenital Defects
- •Dysplasias
- •Chromosomal Defects
- •Congenital Deformity
- •Miscellaneous
- •Summary
- •Further Reading
- •References
- •3: Musculoskeletal Imaging
- •Introduction
- •Conventional Radiographs
- •Shoulder
- •Hand/Wrist
- •Pelvis/Hip
- •The Knee
- •Cervical Spine
- •Bone Scan
- •PET Scan
- •Further Reading
- •4: Skeletal Trauma
- •Introduction
- •Fractures
- •Initial Evaluation
- •Fracture Descriptors
- •Fracture Deformities
- •Fracture Patterns
- •Soft Tissues
- •Vascular Injury
- •Nerve Damage
- •Muscle Injury
- •Ligament Tears
- •Classic Fractures
- •Incomplete Fractures
- •Stress Fractures
- •Pathologic Fracture
- •Physeal Fractures
- •Intra-articular Fractures
- •Fracture Healing
- •Orthopedic Emergencies
- •Acromioclavicular Separation
- •Pelvic Fractures
- •Hip Fractures
- •Femoral Neck Fractures
- •Intertrochanteric Fractures
- •Subtrochanteric Fractures
- •Femoral Shaft Fractures
- •Distal Femoral Fractures
- •Conclusion
- •Further Reading
- •5: Orthopedic Infections
- •Introduction
- •Pediatric Infections
- •Acute Hematogenous Osteomyelitis
- •Pediatric Septic Arthritis
- •Adult Osteomyelitis
- •Adult Septic Arthritis
- •Open Fractures
- •Prosthetic Joint Infections (PJI)
- •Further Reading
- •Biopsy
- •Biopsy Techniques
- •Core-Needle Biopsy
- •Incisional Biopsy
- •Excisional Biopsy
- •Background
- •Clinical Evaluation
- •Radiographic Evaluation
- •X-Rays
- •Computed Tomography
- •Magnetic Resonance Imaging
- •Nuclear Medicine
- •Ultrasound
- •Angiography
- •Staging
- •Staging Systems
- •Amputation
- •Malignant Bone Tumors
- •Classic Intramedullary Osteosarcoma
- •Clinical Presentation
- •Radiographic Findings
- •Histologic Characteristics
- •Treatment Strategy
- •Outcomes
- •Chondrosarcoma
- •Clinical Presentation
- •Radiographic Findings
- •Histologic Characteristics
- •Treatment Strategy
- •Outcomes
- •Clear Cell Chondrosarcoma
- •Mesenchymal Chondrosarcoma
- •Ewing Sarcoma
- •Clinical Presentation
- •Radiographic Findings
- •Histologic Characteristics
- •Treatment Strategy
- •Outcomes
- •Benign Bone Tumors
- •Enchondroma
- •Osteochondroma (Exostosis)
- •Osteoid Osteoma
- •Aneurysmal Bone Cysts
- •Unicameral Bone Cysts
- •Eosinophilic Granuloma
- •Natural History
- •Radiographic Findings
- •Treatment Strategy
- •Soft Tissue Sarcomas
- •Clinical Presentation
- •Radiographic Findings
- •Treatment
- •Outcomes
- •Liposarcoma
- •Myxoid Liposarcoma
- •Leiomyosarcoma
- •Fibrosarcoma
- •Synovial Sarcoma
- •Epithelioid Sarcoma
- •Benign Soft Tissue Tumors
- •Lipomas
- •Schwannoma
- •Fibromatosis
- •Benign Vascular Lesions
- •Tenosynovial Giant Cell Tumor
- •Ganglia
- •References
- •7: Pediatric Orthopedics
- •Growth
- •Remodeling
- •Bone
- •Ligament
- •Periosteum
- •Cartilage
- •The Growth Plate
- •Torsional Variations
- •Infection
- •Osteomyelitis
- •Clinical Features
- •Diagnosis
- •Treatment
- •Septic Arthritis
- •Clinical Features
- •Diagnosis
- •Treatment
- •Septic Joint Destruction
- •Physeal Damage
- •Pathologic Fracture
- •Chronic Infection
- •Juvenile Rheumatoid Disease
- •Hemophilia
- •Lyme Disease
- •Metabolic Disease
- •Hematologic Disease
- •Sickle Cell Disease
- •Leukemia
- •Osteogenesis Imperfecta
- •Down Syndrome
- •Skeletal Dysplasias
- •Achondroplasia
- •Clinical Features
- •Neuromuscular Disease
- •Cerebral Palsy (CP)
- •Polio
- •Regional Orthopedic Problems
- •The Pediatric Hip
- •Treatment
- •Perthes’ Disease
- •Slipped Capital Femoral Epiphysis (SCFE)
- •The Pediatric Knee
- •Osgood–Schlatter’s Disease
- •Osteochondritis Dissecans (OCD)
- •The Discoid Meniscus
- •Popliteal Cysts
- •The Pediatric Foot
- •Flatfoot or Pes Planovalgus
- •Rigid Flatfoot
- •Congenital Clubfoot
- •Metatarsus Adductus
- •Sprengel’s Deformity
- •Congenital Muscular Torticollis
- •Radial Anomalies
- •Congenital Trigger Thumb
- •Pediatric Trauma
- •Non-accidental Trauma
- •Conclusions
- •Pediatric Spine
- •Scoliosis
- •Management
- •Congenital Scoliosis
- •Neuromuscular Deformity
- •Kyphosis
- •Spondylolisthesis
- •Conclusions
- •Further Reading
- •Introduction
- •Musculoskeletal Tissues
- •Articular Cartilage
- •Tendons
- •Ligaments
- •Muscle
- •Meniscus
- •History
- •Physical Examination
- •Special Tests
- •X-Rays
- •Magnetic Resonance Imaging
- •Arthroscopy
- •Acute Traumatic Injuries
- •Immediate
- •Early
- •Late
- •Chronic Overuse Injuries
- •Common Pathologies Treated by Sports Medicine Specialists
- •Hip: Femoroacetabular Impingement (FAI)
- •Knee: Anterior Cruciate Ligament (ACL) Injury
- •Shoulder
- •Further Reading
- •9: The Shoulder
- •Functional Anatomy
- •The Glenohumeral Joint
- •The Glenohumeral Ligaments
- •The Labrum
- •The Rotator Interval
- •The Subacromial Space
- •The Acromioclavicular Joint
- •The Sternoclavicular Joint
- •The Scapulothoracic Articulation
- •The Brachial Plexus
- •History
- •Functional Assessment
- •Inspection
- •Palpation
- •Strength Assessment
- •Neurologic Examination
- •Shoulder Instability
- •Radiographs
- •Magnetic Resonance Imaging
- •Computerized Tomography
- •Electrodiagnostic Testing
- •History
- •Examination
- •Imaging
- •Treatment
- •History
- •Examination
- •Imaging
- •Treatment
- •Osteoarthritis
- •History
- •Examination
- •Imaging
- •Treatment
- •Miscellaneous Arthropathy
- •Adhesive Capsulitis
- •History
- •Examination
- •Imaging
- •Treatment
- •History
- •Examination
- •Imaging
- •Treatment
- •History
- •Examination
- •Imaging
- •Treatment
- •History
- •Examination
- •Imaging
- •Treatment
- •Multidirectional Instability
- •History
- •Examination
- •Imaging
- •Treatment
- •Summary
- •Further Reading
- •10: The Spine
- •Introduction
- •Cervical Spine
- •History
- •Physical Examination
- •Diagnostic Studies
- •Plain Radiographs
- •Magnetic Resonance Imaging
- •Myelography
- •Computerized Tomography
- •Electromyography
- •Clinical Conditions
- •Myelopathy Versus Radiculopathy
- •Neck Sprain-Neck Ache
- •Acute Herniated Disc
- •Cervical Spondylosis
- •Rheumatoid Arthritis
- •Cervical Hyperextension Injuries
- •Cervical Spine Algorithm
- •Conservative Treatment
- •Neck Pain Predominant
- •Arm Pain Predominant (Radiculopathy)
- •Lumbar Spine
- •History
- •Physical Examination
- •Diagnostic Studies
- •Plain Radiographs
- •Magnetic Resonance Imaging
- •Computed Tomography
- •Electrodiagnostic Testing
- •Clinical Conditions
- •Back Strain-Lumbago
- •Herniated Disc
- •Spinal Stenosis
- •Spondylolisthesis
- •Lumbar Spine Algorithm
- •Conservative Treatment Modalities
- •Controlled Physical Activity
- •Drug Therapy
- •Trigger-Point Injection
- •Epidural Steroid Injection
- •Traction
- •Manipulation
- •Physical Therapy
- •Operative Management
- •Decompression
- •Fusion
- •Further Reading
- •11: The Elbow
- •Introduction
- •Anatomy
- •Skeletal
- •Muscles
- •Neurovascular
- •Brachial Artery
- •Musculocutaneous Nerve
- •Median Nerve
- •Radial Nerve
- •Ulnar Nerve
- •History
- •Physical Examination
- •Radiographic Evaluation
- •Stress X-Rays
- •Traction X-Rays
- •Computed Tomography
- •Magnetic Resonance Imaging
- •Electrodiagnostic Tests
- •Nonoperative Treatment
- •Injections
- •Operative Treatment
- •Lateral Epicondylitis: “Tennis Elbow”
- •Medial Epicondylitis: “Golfer’s Elbow”
- •Elbow Arthritis
- •Cubital Tunnel Syndrome (Ulnar Nerve Compression)
- •Olecranon Bursitis
- •Little Leaguer’s Elbow
- •Acute: Traumatic Common Tendon, Ligament, Fracture, Dislocation Injuries
- •Tendon Ruptures
- •Distal Biceps Rupture
- •Triceps Tendon Rupture
- •Dislocations
- •Simple Elbow Dislocation
- •Common Elbow Fractures
- •Olecranon Fractures
- •Distal Humerus Fractures
- •Coronoid Fractures
- •Monteggia Fracture
- •Ligamentous Injuries
- •Lateral Ulnar Collateral Ligament Injury
- •Medial Ulnar Collateral Ligament Injury
- •Further Reading
- •12: The Hand
- •Introduction
- •History
- •Physical Examination
- •Imaging
- •Arthroscopy
- •Pathophysiology
- •Duplication
- •Other Congenital Anomalies
- •Developmental or Acquired Disease
- •Arthritides
- •Nerve Compression Syndromes
- •Tendon Disorders
- •Dupuytren’s Contracture
- •Kienböck’s Disease
- •Infection
- •Trauma
- •Lacerations
- •Other Common Injuries
- •Metabolic Disease
- •Vascular
- •Neoplasms
- •Skin Cancer
- •Other Soft Tissue Masses
- •Management Protocols
- •Further Reading
- •Anatomy
- •Development
- •Biomechanics
- •Gait
- •Patient Evaluation
- •History
- •Physical Examination
- •Radiographic Evaluation
- •Hip Pathology
- •Hip Arthritis
- •Surgical Management
- •Arthroscopy
- •Arthrotomy
- •Osteotomy
- •Arthrodesis
- •Hip Replacement Surgery
- •Complications
- •Summary
- •Further Reading
- •Introduction
- •Anatomy
- •History
- •Physical Examination
- •Imaging
- •Knee Pathology
- •Meniscal Tears
- •Ligament Injuries
- •Patellofemoral Pathology
- •Arthritis
- •Further Reading
- •Anatomy
- •Ligaments
- •Muscles
- •Gait Cycle
- •Trauma
- •Ankle
- •Pilon Fractures
- •Ankle Fractures
- •Syndesmosis Injuries
- •Talus Fractures
- •Calcaneus Fractures
- •Ankle Sprains
- •Hallux Valgus
- •Hallux Varus
- •Hallux Rigidus
- •Lesser Toe Deformities
- •Peroneal Tendon Pathology
- •Cavovarus Foot Deformity
- •Anterior Tibial Tendon Pathology
- •Achilles Tendon Disorders
- •Posterior Tibial Tendon
- •Heel Pain
- •Osteoarthritis
- •Ankle
- •Rheumatoid Arthritis
- •Infections
- •Puncture Wounds
- •Paronychia
- •Diabetic Foot Infections
- •Charcot Arthropathy
- •Tumors
- •Soft Tissue Lesions
- •Bone Tumors
- •Complex Regional Pain Syndrome
- •Further Reading
- •Index

60
J. L. Johnson and R. Golden
Incomplete Fractures
An incomplete fracture, typical in a child, is one
that traverses only a portion of the bone. Two variations have been described. A “greenstick” fracture occurs in the diaphyseal portion of a long
bone. Separation of the cortex only occurs on the
tension side of the bone. The compression side of
a greenstick fracture remains intact. The other
common type of incomplete fracture is the torus or
buckle fracture. This type of fracture occurs in the
metaphyseal region of a bone. In a torus fracture,
the compression side of bone fails and the tension
side remains intact, creating impaction of the cancellous bone. These fractures are almost exclusively seen in the skeletally immature and will be
discussed further in the pediatrics chapter.
Stress Fractures
Stress fractures result from repetitive loading.
Each load being borne by the bone is below the
endurance limit, but through accumulated stress
creates a level of force that fatigues the bone to
the point of failure. These injuries are commonly
seen in the proximal tibia, the second metatarsal,
and the femoral neck. They may heal if the cause
of the force ceases; that is, if the patient stops the
repetitive activity for a period of time. Stress fractures of the femoral neck, especially those located
on the tension side of the bone, are predisposed to
displacement and are usually treated with surgical
stabilization. They usually present as complaints
of groin pain in runners. A high index of suspicion
in evaluating these patients can avoid catastrophic
complications. These fractures are also highly
associated with poor nutritional intake and eating
disorders. Affected patients should be counseled
regarding their exercise and dietary habits.
Pathologic Fracture
These are fractures that occur through abnormal
or diseased bone. Among the more common
examples are those that occur due to tumors,
osteomyelitis, or osteoporosis.
Physeal Fractures
In children, a fracture through the cartilaginous
growth plate can occur. The Salter-Harris classication system precisely characterizes these injuries. Physeal fractures heal very rapidly. They
may be complicated by complete or incomplete
growth arrest, producing shortening or angular
deformity of the limb. A complete description
and treatment of these fractures can be found in
this chapter on pediatric orthopedics.
Intra-articular Fractures
Intra-articular fractures disrupt the joint surface
and articular cartilage. Intra-articular fractures
can specically be complicated by joint stiffness
and/or the development of posttraumatic arthritis.
Fracture Healing
The biology of fracture healing parallels that of
any non-ossied tissue. Fracture healing occurs
in three main phases.
1. Vascular phase. This begins at the time of the
injury and proceeds through the development
of a soft callus. Following an injury, a hematoma forms. The hematoma is inltrated by
cellular elements, which in turn lay down collagen and cause hematoma organization. This
is followed by a vascularization, in which the
organized hematoma is vascularized by small
arterial extensions. The end result of the vascular phase is the development of a soft callus.
2. Metabolic phase. This stage begins about
4–6weeks after the injury. During this period,
the soft callus is reworked by a number of specic cellular elements to produce a rm, hard
callus satisfactory for meeting some mechanical demands. There are biochemical changes
in pH and oxygen tension during this phase
that direct fracture healing.
3. Mechanical phase. This phase begins once a
hard callus is present and is then manipulated
according to the rules of Wolff’s law. Wolff’s

4 Skeletal Trauma
61
law states that bone will remodel according to
lines of stress. The result is that bone will be
strongest in places where there are more compressive forces. Mechanical stress is required
to produce skeletal remodeling during this
phase and ultimately to produce a solid,
mechanically strong bone.
Evaluation ofthePatient
withSkeletal Trauma
The complete evaluation of a trauma patient is
complex and beyond the scope of this chapter. A
number of specic points germane to the orthopedic trauma patient are listed below:
1. History of injury. The mechanism and severity of trauma are important to focus the physical exam and identify commonly associated
injuries.
2. Occupation and activity level of the patient.
Taking these into account is frequently helpful in determining surgical versus nonsurgical treatment as well as subsequent
rehabilitation.
3. Deformity and swelling. These must be carefully evaluated to identify fractures, joint dislocations, or soft tissue injuries.
4. Joint motion. Pain on motion may indicate
intra-articular joint involvement.
5. Neurovascular status. It is imperative that the
neurovascular status of the extremity be
carefully evaluated to document neurologic
decits and to identify surgical emergencies
such as compartment syndrome or arterial
disruption.
6. Integrity of the skin. Great care needs to be
taken to be sure that there is no violation of
the skin over the area of the fracture site. An
open fracture requires urgent surgical care.
Classications ofFractures
Fracture classications are by no means comprehensive or denitive in the description of fractures.
Each fracture is different based on the characteristics of the patient, the mechanism, and the overall
goals of treatment. An ideal fracture classication
has high intraobserver and interobserver reliability, allows for effective communication between
members of the care team, and guides treatment.
Interobserver reliability is the consistency of the
classication between different observers. With a
high interobserver reliability, if multiple people
read the same imaging, they will reach the same
conclusion on the classication of the fracture.
Communicability consists of the degree to which
the classication can describe the fracture pattern
without being able to see the image. How well a
classication guide treatment is dependent on how
each fracture pattern within the classication can
be applied to a treatment algorithm.
Fractures: ThePrinciples
ofTreatment
All fracture treatments require that two basic
goals be accomplished: (1) appropriate reduction
of the fracture and (2) maintenance of that reduction. Different techniques may be used for
achieving these two goals. Reduction of a fracture can be accomplished by closed manipulation, skeletal traction, or open manipulation.
Following reduction, the fracture site must be
stabilized so that the fracture will heal in the optimum position. Stabilization can be achieved with
external methods such as casts, splints, and external xators; with internal methods, using various
devices such as screws, plates, and intramedullary rods; or through the maintenance of the
patient in traction (Fig.4.9).

62
Immobili
and r
Re
Healed
pair
BONE AND JOINT TRAUMA ALGORITHM
J. L. Johnson and R. Golden
Airway, breathing, cardiovascular evaluation (ATLS)
No
History, physical
Focused-local
Neurovascular check
X-ray
Positive–closed Fx Positive–open Fx
Reduce Fx
ze
ehab
X-ray
Healed
habilitation
X-ray
UnsatisfactorySatisfactory
Open Reduction
Internal or Ex Fix
Satisfactory
Not healed
Rx for nonunion
or delayed union
? bone graft
To OR, for debridement and
culture, antibiotics, no
skin closure
If clean
(Grade 1, ?2)
Internal fixation
Return to OR
in 2 days for
redebride and
possible closure
Fig. 4.9 Bone and joint trauma algorithm
Not clean
Leave open; stabilize
as necessary
Return to OR
for redebride
Healed
Rehabilitation
Ye s
Resuscitate
Successful Unsuccessful
Positive dislocation
Reduce
Closed Open
X-ray
Rest
Rehabilitation
Soft tissue repair
if needed
Repair
Negative for bone injury
Soft tissue re
not necessary
Rest
Rehabilitate
Orthopedic Emergencies
There are relatively few orthopedic conditions
that require emergent treatment in the operating
room. Several conditions may require urgent
treatment in the emergency department or trauma
bay, though not necessarily emergent surgery. A
prominent example is an open fracture. While
surgical treatment is nearly always warranted,
they can typically be treated and stabilized in the
emergency department. One indication for emergent surgery is compartment syndrome which
may or may not be associated with skeletal
trauma. Another emergency is vascular trauma
with a concomitant fracture, which is itself associated with a higher risk of compartment syndrome. Arterial injury must be treated in the
operating room as soon as possible to limit warm
ischemia time and to preserve the viability of the
affected limb. Because an associated fracture will
change the natural length of the limb, manipulation of the fractured bone may compromise a
vascular repair. Ideally, such manipulation and
stabilization with an external xator should occur
prior to a vascular repair.
Complications ofFractures
There are a number of complications that can
occur following fractures and joint dislocations.
These include the following:
1. Problems of union.
(a) Malunion: a bone that heals in poor func-
tional position.
(b) Delayed union: a fracture that does not
heal within the usual time frame.
(c) Nonunion: a fracture that has not healed
and will not heal because it has lost the
“biological drive” to heal. In some
instances, a pseudarthrosis, or “false
joint,” develops as a result of a nonunion.

4 Skeletal Trauma
63
A number of reasons can be found for why
fractures do not heal. Excessive motion, infection, steroids, radiation, age, nutritional status, and devascularizaion locally are all causes
of delayed healing. Nonunions can be classied as hypertrophic, atrophic, or oligotrophic.
Hypertrophic nonunions possess the biology
but lack the stability to unite. In contrast, atrophic nonunions lack the biology to heal.
Oligotrophic nonunions represent a mixture
where minimal callus is seen but it is insufcient to unite the fracture. Recognizing the
type of nonunion is important to establish a
treatment plan. Hypertrophic nonunions generally require more stable xation, whereas
atrophic nonunions may require bone grafting
or other modalities to introduce better biology
to the fracture site.
2. Stiffness and loss of motion. These commonly
occur following many types of fractures—
especially intra-articular fractures, in which
arthrobrosis is known to occur. Additional
problems such as bony blocks, loose bodies in
the joints, nerve palsies, and posttraumatic
arthritis may exacerbate this problem.
3. Infection. Open fractures increase the risk of
subsequent infection. Closed fractures treated
operatively are also at risk. The use of implants
increases the risk of infection simply because
they provide a substrate for the microcolonization of certain bacteria. Some bacteria have
the unique ability to sequester themselves
under a slime-like layer called a glycocalyx,
which protects the bacteria from immune
attack and antibiotics and makes cultures difcult to obtain. In addition, the presence of
necrotic bone contributes to infection risk.
4. Myositis ossicans. This problem, previously
mentioned under the heading of muscle injury,
is the development of bone in an abnormal
location, usually as the result of muscle
trauma.
5. Avascular necrosis. This occurs when a portion of the bone loses blood supply and “dies.”
Certain bones are predisposed to this complication due to a tenuous or retrograde blood
supply. The bones most at risk are the head of
the femur, the talus, and the scaphoid. If the
subchondral bone collapses, the bone changes
shape and ultimately arthritis ensues.
6. Implant failure. This is more a complication
of treatment rather than of the fracture itself.
Placed under enough load or repetitions of
load (termed fatigue failure), any implant will
eventually fail. Fixation of fractures begins a
race between fracture healing and implant
failure. Implant failure may lead to a fracture
nonunion and frequently leads to revision
surgery.
7. Chronic Regional Pain Syndrome (reex
sympathetic dystrophy). This unusual and
disastrous complication can be seen after even
trivial trauma and causes the development of
abnormal sympathetic tone. The mechanism
is unknown but may be associated with a partial nerve injury or contusion. The patient
develops an exquisitely painful, tender
extremity with erythema, bone resorption,
and loss of motion. Prognosis depends on
early recognition of the syndrome and timely
initiation of countermeasures such as sympathetic blocks and aggressive physical therapy.
Stellate ganglion blocks are used for involvement of the upper extremity, whereas epidural
blocks and lumbar sympathetic blocks are
used in the lower extremity.
Principles ofFracture Treatment
The purpose of this section is not to provide an
exhaustive list of each fracture. Instead, it is meant
to provide a framework of how to stabilize and
treat fractures from initial evaluation until fracture
union is conrmed clinically and radiographically
via surgical or nonsurgical treatment. The goal of
treatment for any fracture is to restore length,
alignment, and rotation of the bone. This is
achieved through fracture reduction. Reduction
can be achieved by open (making a surgical incision to visualize the fracture components) or
closed (using external manipulation), to approximate the fracture fragments to a more anatomic
length, alignment, and rotation. In the case of a
fracture dislocation, the primary goal of reduction
is to place the joint components into as close to

64
J. L. Johnson and R. Golden
anatomic conguration as possible. Ideally, this
allows the joint to remain stable thus minimizing
further damage to the articular surface and the surrounding soft tissues. Once a reduction has been
achieved, a type of stabilization must be employed
in order for the reduction to be maintained.
The most basic means of stabilization include
splinting and casting. Casts and splints can be
molded with “three points” meaning one point of
force is applied above and below the fracture (in
the same direction), while another is applied in the
opposite direction. This provides a force on either
side of the fracture to “hold” the reduction in place
via the stiff material of the cast or splint. A splint is
a noncircumferential means of stabilization (usually made of berglass or plaster) that is used to
immobilize fractures. The noncircumferential
nature of the splint is meant to accommodate any
post-traumatic swelling of the extremity. For this
reason, they are most appropriately used to maintain a reduction until a more stable form of immobilization can be applied or until surgery. A cast
(also typically made of plaster or berglass) is circumferentially applied to the affected extremity. In
adult trauma, casts are typically not used as an
acute treatment because their circumferential
nature does not allow for soft tissue swelling
around the fracture. This can increase the risk for
compartment syndrome and compression of neurovascular structures. They can be used for stabilization once swelling has subsided in fractures that
are treated nonoperatively to provide greater protection and stabilization than a splint (Fig.4.10).
Traction is a means of applying longitudinal
force to a fracture distal to the fracture site to distract the distal components of the fracture. This
employs direct traction on the distal bone segment. With traction applied, ligamentotaxis, the
tension across intact soft tissue structures (ligaments) allows for distraction of the fracture fragments. The force applied to the fracture segments
via traction and ligamentotaxis then helps realign
the fracture and restore length until surgical xation can be performed. When the structural integrity of a bone is disrupted, it is subject to
deforming forces supplied by the now unrestricted pull of the muscles attached to it. The
unrestricted pull of these muscles “deforms” or
further displaces the fracture segments along the
vector of pull as they contract and shorten. In
adult trauma this is typically done by means of
skeletal traction in the tibia, femur, or calcaneus.
A pin is placed through the bone and the skin.
Weights are then suspended from either side of
the pin to provide a vector of pull to counteract
the deforming forces of the fracture.
Fig. 4.10 Distal radius
fracture—an example of
a well-reduced distal
radius fracture with a
well-molded splint. Note
the dorsal displacement
in the injury lm (small
arrow), and direction of
the force used to create
the “three point” mold in
the reduction lm (large
arrows)

4 Skeletal Trauma
External xation involves the use of pins
placed in the bone along with clamps and rods
attached to the external components of the pins to
hold the bone in the reduced position. Internal
xation uses orthopedic implants placed on or
within the bone to hold the reduced fracture fragment in place. The most commonly used implants
include plates, screws, and intramedullary rods
or “nails.” Each of these methods must be applied
surgically and will be described in further detail
in the following sections.
Principles ofExternal Fixation,
andDamage Control Orthopedics
The term “Damage Control Orthopedics” refers to
provisional immobilization or xation of long bone
fractures to minimize the risk of complications such
as soft tissue damage, fat embolism, increased
inammatory response or severe hemorrhage.
Essentially, the use of less invasive and time-consuming methods of fracture xation to provide temporary stabilization of fractures to allow time for
stabilization of the patient until denitive xation
can be performed. The primary purpose of this is to
avoid the “second hit” effect. High energy trauma
and shock provoke high levels of inammation that
can progress to a dysregulated immunologic
response, the development of organ dysfunction,
and ultimately multisystem organ failure. A “second hit” from prolonged surgical intervention may
precipitate this process. The goal of damage control
orthopedics is to provide stabilization to these injuries when possible while avoiding massive blood
loss, prolongation of surgical time, and further
aggravation of the patient’s inammatory response.
Once adequate resuscitation has been performed
and the patient is stable from the perspective of lifethreatening sequelae from polytrauma, denitive
xation may then be safely performed.
The primary means of damage control orthopedics is the use of external xation. External
xation constructs use a combination of pins,
clamps, and rods to provide stability to fractures.
The pins are placed within the bone at points both
proximal and distal to the fracture site to allow
for manipulation of each segment. After pins pro-
65
Fig. 4.11 External xator
vide a direct interface with the bone, a series of
clamps and bars allow for manipulation, and ultimately stability of the construct. Clamps can be
either simple (one pin to one rod) or modular
which allow multiple pins to be connected to a
rod. Once the clamps are applied, sidebars, or
rods form the link between the proximal and distal bony fragments in the xation construct. Once
the construct is assembled, the proximal and distal fragments can then be manipulated to the
appropriate length, alignment, rotation, and joint
reduction. Once appropriate reduction is
obtained, the clamps can then be tightened to the
pins and bars to effectively lock the construct in
the desired position (Fig.4.11).
Principles ofInternal Fixation
Open reduction and internal xation is the most
common method of surgical fracture treatment.
The core principles of fracture xation are as follows: Fracture reduction to restore anatomical relationships, fracture xation providing stability and

66
J. L. Johnson and R. Golden
allowing early motion, and preservation of blood
supply to the soft tissues and bone. It is important
to understand that xation devices do not cause the
fracture to heal. Rather they provide a stable environment for the bone to heal in an appropriate position through its normal physiology.
With these principles in mind the treating surgeon should consider the type of stability required
to treat the fracture and the type of bone healing
that the xation promotes. Absolute and relative
stabilities are the two main modes of fracture xation. Absolute stability limits motion as much as
possible to promote primary bone healing. Ideally,
this would occur with an anatomic reduction and
compression at the fracture site. With this healing
mechanism no callus is formed. Instead, the bone
uses osteonal cutting cones and remodeling of the
compressed bone. Relative stability does not use
compression at the fracture site and allows some
motion of the fracture components. This promotes
healing via callous formation, also known as indirect bone healing. There is a specic amount of
motion that will allow bone to heal that can be
quantied by the amount of strain present at the
fracture site. Both too little and too much motion
can result in a nonunion.
Once the fracture pattern, desired type of bone
healing, and type of stability have been determined, the next consideration in fracture treatment is the type of xation that will be used.
Plate and screw constructs are one method that
can be used to stabilize fractures. Plates can be
applied in different ways resulting in different
“modes of xation.” Some modes of plating
include compression, tension band, bridging,
antiglide, buttress, and neutralization.
Compression plating is typically used to treat
transverse and oblique fractures. The compression between the plate, bone, and ends of the
fracture is generated by screws which engage in
the bone. The screw head slides down an inclined
plane within the hole, converting the descending
movement of the screw into a compressive force
at a right angle. Thus tightening the screws onto
the plate, and subsequently the bone, compresses
the fracture ends together. This mode is a form of
absolute stability with the goal of direct bone
healing (Fig.4.12).
Tension band constructs are used in bones that
are loaded eccentrically with tension and compression forces and are typically used in periarticular fractures. The plate is applied to the
Fig. 4.12 Radial shaft
fracture—this is a radial
shaft fracture treated
with compression
plating. Note the
anatomic reduction of
the fracture site marked
by the arrows

4 Skeletal Trauma
concave (tension) side of the bone. Tensile forces
are converted into compression at the fracture
site. This mode of xation is most useful for fractures that have failed in tension such as olecranon
and patella fractures. The aim is typically absolute xation and direct bone healing (Fig.4.13).
A tension band construct for an olecranon
fracture. The tensioned wire (shown by the
arrows) converts tensile forces into compression forces across the fracture site.
Neutralization plating is used in conjunction
with compression screws known as lag screws
typically for oblique or spiral fractures. After an
anatomic reduction is made with provisional xation, lag screws are placed perpendicular to the
fracture line to provide compression at the fracture site. The neutralization plate serves to support the lag screws by protecting them by
“neutralizing” torsional and bending forces. This
is a method of absolute stability with the ultimate
goal of direct bone healing (Fig.4.14).
Buttress and antiglide plating use similar concepts with subtle differences in function to achieve
compression at the fracture site. They are placed
across vertically oriented partial articular fractures
to support or “buttress” the sheared fragment into
compression. To accomplish this, an under contoured plate is placed across the proximal and distal components sides of the fragment. With the
plate contacting the proximal and distal sides of
the fracture, tightening the screws will then buttress the fragment into compression. Antiglide
plating uses a similar mechanism but is primarily
used to prevent shortening of the metaphyseal or
diaphyseal region of the bone rather than an intraarticular fragment. They are combined with lag
screws to provide compression. Each mode of xation provides absolute stability with the ultimate
goal of direct bone healing (Fig.4.15).
A bridge plate is commonly used in comminuted fractures where the individual fracture
components are either too small or too complex
to be adequately reduced by provisional or denitive xation. The fracture components are
67
Fig. 4.13 Tension band—this is an example of an olecranon fracture treated with a tension band construct. The
wire on the outside of the bone converts tensile forces into
compression forces across the fracture site
reduced to appropriate length, alignment, and
rotation, and the plate is secured with screws to
span or “bridge” the fracture site. This mode of
xation uses relative stability, with the aim of
indirect bone healing (Fig.4.16).

68
Fig. 4.14 Neutralization plate—a bula
fracture treated with a
lag screw and a
neutralization plate. The
lag screw (marked with
the arrow) provides
compression across the
fracture site, while the
plate provides rotational
stability
J. L. Johnson and R. Golden
Fig. 4.15 Buttress plate—this is a tibial plateau fracture
treated with a buttress plate. The plate pushes, holds up, or
“buttresses” the sheared fragment to provide a compressive force across the fracture site
Fig. 4.16 Bridge plating—this plate in this example
bridges a comminuted ulna shaft fracture from a ballistic
injury

4 Skeletal Trauma
69
Intramedullary nailing uses similar principles
to bridge plating in long bone fractures. Once a
nail is positioned across a fracture within the
intramedullary canal, the nail is locked in position above and below the fracture site. This provides relative stability, and allows the fracture to
heal though indirect bone healing.
Treatment ofLong Bone Fractures
Treatment of long bone fractures is centered
around providing a favorable environment for the
process of bone healing as described earlier in
this chapter. The placement of implants via internal xation is not what “heals” the bone. Implants
simply provide the bone with the structural integrity compromised by the fracture to allow fracture healing and remodeling within accepted
parameters of length, alignment, and rotation. If
each of these parameters can be achieved with
nonoperative forms of fracture treatment such as
splinting, casting, or bracing, then surgery via
internal or external rotation should not be
performed.
Treatment ofPeriarticular Fractures
Successful treatment of periarticular fractures
centers around the preservation of the affected
cartilage. By preserving as much of the cartilage
as possible, the structural integrity of the joint
can be maintained to allow smooth articulation of
the joint. The basic principles to achieve this are
anatomic reduction, stable xation, early range
of motion, and protected weight bearing.
Anatomic reduction limits any step offs or gaps
in the cartilaginous surface to restore as much of
the native joint anatomy as possible. Defects or
incongruities in cartilage cause increased permeability, decreased strength, and decreased young's
modulus of elasticity of the cartilaginous surface.
Reducing the joint as anatomically as possible
can never fully prevent these issues, but it can
limit the risk of post traumatic arthritis.
Early range of motion serves two essential
functions in the postoperative period. First, carti-
lage has a poor blood supply due to its relatively
avascular nature and depends on diffusion from
synovial uid for nutrients. Prolonged immobilization of the joint limits diffusion from synovial
uid and leads to atrophy or cartilage degeneration, and decreased proteoglycan/collagen ratio.
Range of motion in the postoperative period is
thought to mitigate these factors to provide nutrients to the healing cartilage. In addition and just
as important, early range of motion limits the
degree of stiffness that develops after a fracture
has occurred.
Fractures andDislocations by
Region: TheUpper Extremity
The treatment of upper extremity fractures follows the same basic principles of anatomic articular reduction, restoration of length, alignment,
and rotation. However, the upper extremity has
important differences in function, complications,
and clinical considerations as compared to lower
extremity fractures. The main difference in treatment is that weight bearing is not a primary function of the upper extremity. Rather the primary
function of the upper extremity is to be able to
position the hand in space. In the context of fracture xation, and ultimately recovery, the most
important of these functions are positioning the
hand for activities of daily living. The most basic
of these functions are feeding and hygiene. The
section below provides an overview of the pathology and treatment of the most common upper
extremity fractures.
Fractures oftheClavicle
In adults, fractures of the clavicle typically occur
from a fall directly onto the shoulder. Because of
the proximity of the subclavian vessel behind the
clavicle and the proximity of the brachial plexus,
a careful neurovascular evaluation is imperative.
There have recently been several large multicenter trials that have helped to dene operative
indications for clavicle fractures. However, the
majority of clavicle fractures can still be treated
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