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Prophylactic Procedures
Данная книга находится в списке для перевода на русский язык сайта https://meduniver.com/
forOrthopedic Pathologies
FuatAkpinar , KorhanOzkan , KrishnaReddy , EsatUygur andMehmetSalihSoylemez
, ErhanOkay ,
35
35.1 Introduction
Orthopaedics and traumatology encompasses many subspecialities involving pediatric orthope­dics, orthopedic oncology, hand surgery, foot and ankle surgery, traumatology, deformity manage­ment, sports medicine, and arthroplasty. In this chapter, we aimed to give a brief information for some prophylactic procedures in orthopedics, which may be useful not only for orthopedic sur­geons, but also to other doctors to have a general idea for referring their patients and adequately addressing their problems. Timely implementa­tion of prophylactic procedures may decrease the patient’s morbidity and even mortality, especially in oncological cases. For example, simple treat­ment of developmental hip dysplasia in infancy with pelvic harness may prevent formidable hip arthroplasty in early adulthood, or prophylactic
F. Akpinar · K. Ozkan (*) · E. Uygur · E. Okay Department of Orthopaedics, Istanbul Medeniyet University Goztepe Education and Research Hospital, Istanbul, Turkey e-mail: fuat.akpinar@medeniyet.edu.tr; korhan.
ozkan@medeniyet.edu.tr; esat.uygur@medeniyet. edu.tr; erhan.okay@saglik.gov.tr
K. Reddy Department of Orthopedics, University of Cincinnati & VA Medical Center, Cincinnati, OH, USA
M. S. Soylemez Department of Orthopaedics, Health Sciences University Umraniye Training and Research Hospital, Istanbul, Turkey
xation of an impending fracture in a patient with bone metastases may improve patient survival substantially. Simple prophylactic exostectomy for small diabetic foot ulcer may prevent an unnecessary amputation in future. In this context, three main topics were selected for prophylactic surgery in orthopedic pathologies, including pathological fractures, foot and ankle problems and osteoarthritis of knee and hip, and develop­mental hip dysplasia.
35.2 Prophylactic Surgery
toPrevent Pathologic Fractures
A fracture that develops through an area of bone pathology is termed as a pathologic fracture. When the extent of bone destruction is such that a bone can no longer withstand physiologic loads and a fracture is imminent, it is termed as an impending fracture. Pathologic fractures can be secondary to a benign lesion, such as Paget dis­ease, giant cell tumor of bone, hemangioma, or a malignant tumor, which may be a primary bone or hemopoietic malignancy (osteosarcoma, chon­drosarcoma, lymphoma, multiple myeloma) or metastatic carcinoma.
The common solid tumors that metastasize to the bone arise from breast, prostate, kidney, lung cancer, or thyroid gland [1]. Metastases to bone develop in about two-thirds of all patients who die from cancer [2]. Involvement of bone is seen
© The Author(s), under exclusive license to Springer Nature Switzerland AG 2021 O. N. Dilek et al. (eds.), Prophylactic Surgery, https://doi.org/10.1007/978-3-030-66853-2_35
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in <95% of patients with multiple myeloma, 75% of patients with breast and prostate cancer, and 15–40% of patients with other types of tumors [3]. The most common origin of bone metastasis due to a solid organ is breast carcinoma in women and prostate carcinoma in men. Skeletal lesions can be also the rst manifestation of malignan­cies in 25–30% of solid organ tumors. Bone metastasis can also develop in patients with osteosarcoma, chondrosarcoma, and Ewing’s sarcoma; however, soft tissue sarcoma rarely causes bone metastases. Pain, pathologic frac­ture, hypercalcemia, and spinal cord compression are forms of skeletal-related events (SREs) due to bone metastases [4].
Multiple myeloma is another frequent cause of the pathological fracture. It is characterized by a malignant monoclonal proliferation of plasma cells. It is the second most common hematologi­cal malignancy after non-Hodgkin’s lymphoma and the most common primary bone tumor in older patients. In multiple myeloma bone dis­ease, the interaction between malignant plasma cells and bone microenvironment leads to increased osteoclastic function with decreased osteoblastic activity. Twenty-ve percent of the patients present with spontaneous fracture, and the death rate is increased by more than 20% in these patients with pathological fractures. Stavropoulous etal. found that the patients pre­senting with a spontaneous fracture at diagnosis had poorer prognosis with median overall sur­vival of 30months compared to 86 months in those without fractures. The risk of death was also signicantly increased in patients who devel­oped all subtypes of fracture after multiple myeloma. Prophylactic xation before complete fracture occurrence, therefore, is an important treatment strategy in these patients.
The goals of treatment, regardless of underly­ing etiology, are to minimize morbidity and maxi­mize function and skeletal integrity. For most patients with a completed or impending pathologic fracture of a long bone, this will necessitate surgi­cal xation. Surgical treatment of impending frac­tures is technically easier and less morbid compared to surgical treatment of complete patho­logical fractures. In various studies, surgical xa-
tion of impending fractures due to metastatic bone disease has also demonstrated improved longer survival in comparison to complete pathological fractures. The improved survival could be attrib­uted to the fact that xation of impending fracture bears advantages of less morbidity, which results in correspondingly low secondary surgical com­plications, such as infection, implant failure, and venous thromboembolism, among others. It also contributes toward the timely initiation of chemo­therapy or radiation treatment for these patients.
The diagnosis of impending or complete path­ological fracture is established on radiographic studies. With advances in imaging technologies, such as whole-body-magnetic resonance imaging (MRI), positron emission tomography-computed tomography (PET-CT) allows for whole-body screening with high sensitivity and specicity. This has enabled early diagnosis of impending fractures in asymptomatic patients and treatment with radiation therapy with or without early sur­gical xation.
One of the most common scoring systems used in decision-making in a metastatic extrem­ity lesion is Mirels’ classication. It is based on four characteristics. It takes into account the site of the lesion (upper limb/lower limb/trochanteric region), nature of the lesion (blastic/mixed/lytic), size of the lesion, and presence of pain. Points are allocated as shown in Table 35.1. The scoring
Table 35.1 Mirels’ scoring system
Site of lesion Score
• Upper limb 1
• Lower limb 2
• Trochanteric region 3 Nature of lesion
• Blastic 1
• Mixed 2
• Lytic 3 Size of lesion
• 1/3 of cortex 1
• 1/3–2/3 of cortex 2
• >2/3 of cortex 3 Pain
• Mild 1
• Moderate 2
• Functional 3
35 Prophylactic Procedures forOrthopedic Pathologies
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Table 35.2 Treatment recommendations according to Mirels’ score
Mirels’ score Treatment recommendation 7 8 Use clinical judgment 9
Radiotherapy and observation
Prophylactic xation
system suggests a treatment algorithm based on the total score (Table35.2).
Lesions in the pertrochanteric area are at the highest risk of fracture due to maximal stresses on this part of the femur on load-bearing. For scores 7, the lesion can be treated conserva­tively with radiotherapy and observation. For a score of 9, prophylactic xation is recom­mended. The overall score of eight presents a clinical dilemma. The probability of fracture is only 15%, and Mirels’ recommended the treat­ing attending physician to use clinical judge­ment in such cases in considering prophylactic xation [5].
Precise estimation of survival in patients with metastatic disease is of utmost importance and allows for treatment planning for patients who present to healthcare facilities with impending or complete pathological fractures. Treatment modalities vary depending on estimated survival, and PathFx model is a new promising prediction model, taking into consideration age, gender, type of pathological fracture, presence of vis­ceral metastasis, lymph node metastasis, hemo­globin and leukocyte concentration at initial presentation, primary oncological diagnosis, number of bone metastasis, and ECOG status of the patient. It has been validated in various popu­lations [6, 7].
For solitary lesions, a different treatment strat­egy is recommended, especially if the metastatic lesion is arising from renal cell carcinoma (RCC) or thyroid carcinoma. In these lesions, wide sur­gical resection compared to surgical xation is important, as it is related to improved survival and even complete cure of the disease in some cases. The decision is made jointly by an ortho­pedic oncologist, medical oncologist, and radia­tion oncologist.
The impending pathological fractures of the extremities can be treated using orthopedic plates or intramedullary (IM) nails (Figs. 35.1 and
35.2). Plate xation offers a load-bearing con-
struct, whereas intramedullary nailing works a load-sharing construct. Where feasible, IM nail­ing is preferred as it is as a load-sharing device, is possible to be performed closed (without opening up the site fracture or pathology), and has the advantage of spanning most of the length of the long bone, thereby preventing the need for fur­ther intervention should a subsequent lesion develop in the same bone.
The aim of radiotherapy in patients with bone metastasis is to improve the quality of life, main­tain skeletal function, and minimize pain. Radiotherapy, as a treatment modality in patients who have metastatic lesions of the long bone, should be planned according to the Mirels’ scoring system [5]. Radiotherapy in patients with bone metastasis aims to improve the quality of life, maintain skeletal function, and minimize pain. Radiotherapy enables to destroy tumor cells and, therefore, provides a suitable environment for potential union. Apart from being the basic modal­ity of treatment for patients with Mirels’ score of 7 or under, radiotherapy is also utilized in an adju­vant manner following stabilization of a complete or impending pathological fracture in a patient with Mirels’ score of 9 or more (Table35.1).
With improvements in chemo and radiother­apy, surgical xation techniques with newer reli­able implants decreased surgical complications. It is possible to improve the overall quality of life for patients with impending and complete patho­logic fractures. The orthopedic surgeon treating the patient must be aware of compromised heal­ing characteristics of pathologic bone along with increased infection rates in these patients due to underlying tumor processes and related treat­ment. Where possible, an orthopedic oncologist should be involved in the care of such patients. The ultimate goal is to obtain immediate func­tional recovery and strategies to allow for appro­priate adjuvant treatments to improve the overall quality of life in these patients.
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a
c
d
b
Fig. 35.1 The 44-year-old woman with bilateral impend­ing proximal hip fracture due to metastatic breast carci­noma (a) preoperative view. (b) After implementation of
bilateral proximal femoral nails. (c) At 6months after sur­gery, this time complete fracture at the distal femoral diaphysis, (d) plate xation was performed
a b c
Fig. 35.2 The 84-year-old woman with right complete fracture and left impending fracture due to metastatic breast carcinoma (a) preoperative radiograph. (b)
Preoperative MRI. (c) Long-cemented prosthetic replace­ment to the right hip and long reconstruction nail xation on the left femur
35 Prophylactic Procedures forOrthopedic Pathologies
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35.3 Prophylactic Surgery inFoot andAnkle
The foot is a unique structure designed to with­stand signicant loads. It is, thus, imperative that preoperative planning plays a signicant role in foot and ankle surgery. When a surgeon performs an osteotomy or a tendon surgery, the biome­chanics of the foot are altered. The foot is unique in that it molds as it is squeezed into a shoe. The bony prominences, minimal subcutaneous tissue, and presence of any implants in a foot may con­tribute to persistent pain. There are certain cir­cumstances where prophylactic surgery for the foot and ankle is indicated.
In hallux valgus surgery, the metatarsal parabola needs to be restored intraoperatively. When shortening osteotomies of the rst meta­tarsal are performed, the lesser metatarsals may remain relatively longer. This consideration should be included in the preoperative plan, and intraoperatively lesser metatarsals may need shortening to prevent formation of callosities and pain under the second (or third) ray (Fig.35.3ac). Likewise, in patients with hallux rigidus undergoing rst metatarsophalangeal arthrodesis, it is recommended that the interpha­langeal sesamoids (if present) be excised to pre­vent late symptoms [8].
Patients with peripheral neuropathy or Charcot foot have signicant issues with wound healing and are at high risk for developing decubitus ulcers [9]. In such patients, prophylactic exostec-
tomy to remove bony prominences assists not only with wound healing, but also in the preven­tion of ulcers and should be considered.
It is not uncommon to have patients complain of hardware-related symptoms in the foot and ankle as discussed earlier. They may complain of prominent plates or screw heads making shoe wear uncomfortable. Implant removal may also be considered as prophylactic surgery in these circumstances. In clinical practice, some sur­geons routinely advise implant removal to their patients.
35.4 Prophylactic Surgery
toPrevent Knee Osteoarthritis andPain
Osteoarthritis in the knee joint (gonarthrosis) develops due to the joint cartilage damage caused by injury to the joint cartilage or improper distribution of forces on the joint because carti­lage functions as a weight-bearing layer and absorbs and distributes loads to the underlying bone [10]. The nonuniform distribution of loads on cartilage is the most common pathology caus­ing primary osteoarthritis in the human knee, and the development of osteoarthritis can be pre­vented, delayed, or even partially cured by pro­phylactic surgical methods. Prophylactic restoration of the anatomy aims to preserve the biological vitality of the patient’s tissues as much as possible rather than changing them to prosthe-
a bc
Fig. 35.3 The 57-year-old female patient was complain­ing metatarsalgia under the second and third ray of the foot. Painful callosities were observed (a). She underwent an osteotomy due to hallux valgus deformity 8years ago. Relatively long metatarsals (marked with asterix) were
d
seen at her foot anteroposterior radiograph, which is con­sidered to be the reason for the pain (b). After metatarsal shortening osteotomies were performed (c), the callosities were spontaneously relieved in the long term (d)
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ses in the future after the development of the gon­arthrosis [11].
The alignment and rotation of the lower extremity have been developed in harmony with surrounding ligaments and muscles. Patella joins this harmony positioned in/and between a tendon and ligament. It transfers load from the hip to the tibia and stabilizes the joint in many ways. Q angle is the angle between the quadriceps muscle and the patellar tendon and determines the direc­tion of the forces affecting the patella. Any change in pelvic angle, hip anteversion, tibio­femoral angle, tibial torsion, navicular drop, the existence of genu recurvatum, and femoral and tibial length also affects the Q angle and may alter the direction of the forces and load distribu­tion at patellofemoral joint [12]. This situation is the main reason for patellofemoral osteoarthritis and knee pain. There are several prophylactic surgical procedures, including soft tissue inter­ventions, bony interventions, and combined to prevent this condition. For example, Maquet osteotomy, Elmslie-Trillat osteotomy, and Fulkerson osteotomy are the procedures mostly used to restore the Q angle by distal realignment
of the patellar tendon [1315]. Medial patello­femoral ligament (MPFL) reconstruction, lateral retinacular release, and medial plication are some examples of soft tissue interventions [16]. Depending on the extent of the pathology, these procedures with derotational osteotomies of the femur and/or tibia may also be used to restore the anatomy [17] (Fig.35.4).
There is a unique longitudinal alignment between the femur and tibia, both on sagittal and coronal planes. Disruptions, particularly on the coronal plane, lead to genu varum (the main rea­son for medial knee pain and osteoarthritis) or genu valgum [18]. In pediatric age, trauma, infec­tion, radiation, or some metabolic diseases may cause physeal arrest of the proximal tibia or distal femur. These conditions may lead to imbalanced longitudinal growth and deformity in three planes around the knee. To prevent the development of malalignment in any plane, physeal bar excision, epiphysiodesis, and limb lengthening or deformity correction with circular xation, or a combination of these techniques can be used [19] (Fig.35.5). However, treatment strategies for adults are differ­ent for coronal knee deformities. These patholo-
a
Fig. 35.4 (a, b) Preoperative X-rays of a 23-year-old patient with patellar instability. The patient had undergone an unsuccessful MPFL repair surgery 3years ago and now complaining from anterior knee pain and feeling of sub­luxation. (c) Intraoperative image showing the medial transfer of the patellar tendon. (d, e) Postoperative AP and
b
c
d
lateral X-rays showing patellofemoral ligament recon­struction using hamstring allograft and distal patellar ten­don realignment using Elmslie-Trillat osteotomy technique. Note the centered patella on the femur when compared to preoperative X-rays
e
35 Prophylactic Procedures forOrthopedic Pathologies
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ab c
429
Fig. 35.5 (a) A 6-year-old boy sustained a lateral tibial physeal arrest after conservatively treated proximal tibia fracture. After 3years of follow-up, the patient developed a genu valgum deformity namely “Cozen deformity” on the right side. (b) AP preoperative X-rays of both knees
gies can be addressed using proximal tibial osteotomies [20]. Genu valgum is a relatively rare pathology, and most of the surgeons have dened procedures focusing on correcting the genu varum. Proximal tibial lateral closed or medial open oste­otomies have been reported to be very effective to restore the alignment, prevent the development of the osteoarthritis, and alleviate the medial knee pain. However, all these procedures have potential complications like deep vein thrombosis, peroneal nerve palsy, wound infections, nonunion, etc. From this point of view, surgeons have currently focused on a different concept to prevent knee pain and osteoarthritis [21].
The theory “asymmetrical subsidence” claims that the proximal tibial plateau has a relatively soft metaphysis prone to osteoporosis by the age. As the lateral tibia plateau is supported by three cortexes (two bular and one lateral tibial cortex) and medial plateau by one cortex, a subsiding much more severe on the medial side may occur and lead to the development of a genu varum and medial knee compartment osteoarthritis [21]. From this point of view, resection of the bula with or without arthroscopic debridement of the knee and/or medial high tibial osteotomy for selective cases has been reported to be a safe, promising, and more biological way as a prophy-
showing lateral growth arrest and progressive genu val­gum. A medial epiphysiodesis with a plate was carried out for the patient. (c) Postoperative AP X-rays after 7months showing remarkable improvement in alignment
lactic surgical procedure (Fig.35.6).This proce­dure must be performed for patients with a varus less than 5°, as the patients with severe varus have been reported not to benet from only bu­lar resection [11].
35.5 Prophylactic Surgery toPrevent Hip Osteoarthritis DuetoAcetabular Dysplasia
The hip joint connects the lower limb to the trunk and provides a basis for the upright posture and balanced movement. The hip joint is sup­ported by a large number of ligaments and sur­rounding muscles during hip movements, thereby producing unlimited movement modi­cations and amplications [22]. The hip joint is a ball-and- socket-type joint. Socket part is formed by os pubis, os ischii, and os ilii connected with Y-shaped triradiate cartilage. And the ball part is the head of the femur. In acetabular dysplasia, a developmental deciency exists on the acetabu­lar side of this joint. The acetabulum continues to develop up until the ages of 8–13, and any kind of interruption of the growth eventually leads to an acetabulum deciency [23]. This interruption of the growth may occur due to the
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Fig. 35.6 (a) Preoperative orthoroentgenogram of a 40-year-old man complaining left knee medial compart­ment pain. The X-ray revealed an onset of osteoarthritis in the medial compartment and 3° varus malalignment. (b) AP postoperative X-ray showing segmental bular resec-
injury or infection of the triradiate cartilage or the inadequate treatment of a previous develop­mental dysplasia of the hip (DDH), etc. [24]. In most cases, there is a deciency in the anterolat­eral wall of the acetabulum. However, the de­ciency can be detected in the posterior wall as well. Although it varies according to the amount, shape, and place of the dysplasia, dislocation, subluxation, or secondary osteoarthritis almost always occur later in life due to imbalanced and inharmonious movements between the femur and acetabulum. Depending on the amount of dysplasia, degenerative complaints frequently arise in adolescents. However, the onset of the symptoms may not be seen until the sixth decade of life as well [25]. Since hip dysplasia is a pathology with the risk of creating irreversible
tion performed. Also, arthroscopic debridement of the joint was carried out. (c) Postoperative orthoroentgeno­gram in the third month. Although there was no radiologi­cal improvement in the alignment, the patient returned to daily activities with a pain-free knee joint
problems in the patient’s future life, it should be treated prophylactically with various methods to prevent degenerative changes even if it does not cause complaints as soon as it is noticed until the fth decade of life [26].
35.6 Prophylactic Interventions forAcetabular Dysplasia fromInfancy totheAge of8Years
In the early examination in infants, positive Barlow and Ortolani tests are indicative of unstable hip dislocation. Although there are several reasons for this condition, the most common factor is the loose capsule, which can-
35 Prophylactic Procedures forOrthopedic Pathologies
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431
not keep the femoral head in the acetabulum. The rst prophylactic treatment of acetabular dysplasia begins at this stage, and this is when the treatment is easy and most effective. Because keeping the femoral head in acetabu­lum by preventing the dislocation of the head or with the reduction of a dislocated head applies pressure to the triradiate cartilage, and acetabu­lum starts to reshape and develop. This often results in a gradual deepening and decrease in the inclination of the acetabulum. However, this is not always the case, and the acetabulum can remain shallow and inclined (acetabular dyspla­sia) more than normal ranges. Hip ultrasonogra­phy is now being routinely performed for newborns, usually 6 weeks after birth for the DDH survey. Graf type 2b, c, and d hips are dysplastic hips and need to be treated prophy­lactically to prevent further deterioration of the hip joint [27]. Using a Pavlik harness for 6weeks is the most preferred way of the treat­ment [28]. The aim is still the same; directing the femoral head to the acetabulum with the harness and keeping it in the acetabulum. Although there are several different opinions, closed reduction with or without adductor tenotomy and preservation of the reduction in a hip spica cast (pelvipedal) for 3months is the most preferred treatment choice for children between the 6 and 12months old with persistent or newly diagnosed dysplasia. If a closed reduc­tion cannot be achieved, an open reduction
using a medial approach is performed at this stage [29]. The closed reduction generally may not be effective to reduce the hip after 12 months. Thus, an open reduction using a medial, anterior, or anteromedial incision is used to intervene in the soft tissues that hinder the concentric reduction of the hip. The pre­ferred approach is the anterior incision. After the procedure, the reduction must be preserved in a hip spica cast for 3months. For dysplasia that persists after 18months, both bone and soft tissue interventions are required. The goal is to increase the anterolateral acetabular coverage, and the need for additional procedures like cap­sulorrhaphy and other interventions are per­formed according to the severity of the case [30]. Although many different types of osteoto- mies have been dened, Salter and Dega oste­otomy is the most performed osteotomy in this stage (Fig. 35.7). However, Pemberton, Pembersal, and many other osteotomy tech­niques can also be used for this age group. All these techniques have special indications and are used for particular cases until the age of 8. Even though there are controversies about the age limit, it is assumed that simple iliac osteoto­mies may not be sufcient to provide coverage due to the closed triradiate cartilage after 8years of age. Thus, after the closure of the tri­radiate cartilage in any age, osteotomization of three pelvic bones (ilium, ischium, and pubis) is needed for the redirection of the acetabulum.
ab c
Fig. 35.7 (a) AP X-ray of a 22-month-old girl showing the incidentally diagnosed dysplasia of the right hip. (b) Initial postoperative AP X-ray showing perfect anterolat­eral coverage of the hip after a modied Salter osteotomy
procedure. (c) AP X-ray at postoperative seventh year showing perfect development of the acetabulum without any residual dysplasia
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35.7 Prophylactic Surgery forAcetabular Dysplasia inAdolescents andAdults
In untreated or incidentally diagnosed cases, the femoral head forms an unstable joint surface that constantly goes up and down with the edge of the acetabulum (Fig. 35.6a). This instability often creates degenerative changes that occur in young adolescents and generally progresses within a few years. If the acetabulum is redirected, the forces on the femur head will be distributed on a larger surface, and this can prevent and even reverse degenerative changes [31]. This is why a groin pain increasing with exion and internal rotation of the hip must be a warning sign of dys­plasia in adolescents and young adults. Although 8years of age is debatable, according to the gen­eral opinion, the triradiate cartilage closes and does not function after this age. Redirecting or reshaping the acetabulum with the aforemen­tioned techniques becomes impossible, as closed triradiate cartilage does not bend with simple osteotomies like Salter osteotomy [23]. Thus, more complicated osteotomies must be employed after this age group. If the triradiate cartilage is still open between the ages 8 and 15, triple innominate osteotomy (Steel, Tönis), double innominate osteotomyi (Sutherland), or Dega osteotomy can be performed to remediate the
defective coverage of the acetabulum. However, if the patient is older than 15, more complicated procedures like incomplete triple pelvic osteot­omy (a modied form of Steel osteotomy, ITPO) (Fig.35.8), triple innominate osteotomy (Steel), Ganz (Bern) [32], or spherical osteotomies (Wagner, Epright) are inevitable. The choice of the technique depends on the surgeon’s experi­ence and concentric reduction of the hip detected with preoperative abduction-internal rotation AP X-ray of the affected hip joint. ITPO is a good and applicable technique in cases with a concen­tric reduction [33]. Although Steel osteotomy is preferable for slight and moderate dysplasias, Ganz osteotomy could be better in severe cases. Cases in which concentric reduction cannot be achieved, salvage procedures like Chiari osteot­omy and shelf acetabuloplasty can be performed. These techniques do not prevent degenerative changes, however, they prevent subluxation and dislocation of the hip.
35.8 Conclusion
Timely implementation of prophylactic surgery in orthopedics is usually associated with decreased patient morbidity. Prophylactic sur­gery obviates the need of more extensive surgical procedures with more complications by decreas-
ab
Fig. 35.8 (a) AP X-ray of a 34-year-old woman showing dysplasia of the right hip. Subchondral cyst at the acetabu­lum is an indicator of the onset of degeneration and osteo­arthritis. (b) Abduction-internal rotation AP X-ray showing concentric reduction of the hip, which means that
a prophylactic redirectional osteotomy may be benecial for this patient. (c) Initial postoperative AP X-ray of the right hip showing perfect anterolateral coverage of the hip after an incomplete triple pelvic osteotomy without later­alization or retroversion of the acetabulum
c
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