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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 classi­cation 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 specically be complicated by joint stiffness and/or the development of posttraumatic arthritis.

Fracture Healing

The biology of fracture healing parallels that of any non-ossied 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 inltrated 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
4–6weeks after the injury. During this period, the soft callus is reworked by a number of spe­cic 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 ofthePatient withSkeletal Trauma
The complete evaluation of a trauma patient is complex and beyond the scope of this chapter. A number of specic 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 decits 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.
Classications ofFractures
Fracture classications are by no means compre­hensive or denitive 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 classication 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 classication between different observers. With a high interobserver reliability, if multiple people read the same imaging, they will reach the same conclusion on the classication of the fracture. Communicability consists of the degree to which the classication can describe the fracture pattern without being able to see the image. How well a classication guide treatment is dependent on how each fracture pattern within the classication can be applied to a treatment algorithm.
Fractures: ThePrinciples ofTreatment
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 ofFractures
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 classi­ed 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 insuf­cient 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 arthrobrosis 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 dif­cult to obtain. In addition, the presence of necrotic bone contributes to infection risk.
4. Myositis ossicans. 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 (reex 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 ofFracture 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 conrmed 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 conguration 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 ofExternal Fixation, andDamage 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 inammatory 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 denitive 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 inammation 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 inammatory response. Once adequate resuscitation has been performed and the patient is stable from the perspective of life­threatening sequelae from polytrauma, denitive 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 ofInternal 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 specic amount of motion that will allow bone to heal that can be quantied 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 deni­tive 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 ofLong 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 ofPeriarticular 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 andDislocations by Region: TheUpper 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 oftheClavicle
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 dene operative indications for clavicle fractures. However, the majority of clavicle fractures can still be treated