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Under the drapes, a chest pad prevents the patient from being pulled off the table with traction; a sheet wrapped around the torso and held by an assistant would accomplish the same purpose. In children and adolescents, this most commonly occurs in the presence of a spondylolytic defect or a nonunion of the pars interarticularis. The rectus femoris muscle is dissected from proximal to distal, freeing it completely from the surrounding quadriceps muscle group. Bone scan examination may demonstrate subtle implant loosening that may not be appreciated on plain radiographs or at the time of surgery and may help the surgeon decide whether to retain or remove implants that appear well fixed. In pure ligamentous patterns, the stability of the injury depends on the status of the plantar tarsometatarsal ligaments. Arthrodesis of the knee after an infected total knee arthroplasty using the Ilizarov method. Open wounds may change the management of this injury; obvious deformity helps in the initial diagnosis. Sagittal plane knee (A) and hip (B) kinematic plots of a child with a jump gait pattern. The elbow is rotated to allow for oblique views of the medial and lateral columns. Stability of fixation should be tested intraoperatively with fluoroscopy, and additional fixation is added as necessary. There was an average correction of 20 degrees, and no postoperative loss of correction occurred. Care must be taken to evaluate other possible sources of injury about the hip as well as associated ipsilateral injury. All patients should have the appropriate infection laboratory studies (ie, complete blood count, C-reactive protein, erythrocyte sedimentation rate) as well as an attempt at knee aspiration and synovial fluid sent for Gram stain, cell count, and culture. These findings are helpful in guiding plans for bone grafting of lytic lesions and identifying remaining bone stock. The long lateral view radiograph of the lower extremity is assessed for underlying fixed flexion deformity of the knee. If surgery is being considered, systematically assess the surrounding skin for mobility and for the presence and location of scars from any previous surgical procedures (previous scars may influence surgical approach). After radiographic documentation of the reduction and wire placement, cannulated screws of appropriate length may be placed over the wires after drilling of the out cortices with a cannulated drill. The anterior capsule should be loose enough to allow external rotation of the femur such that the greater trochanter approaches one fingerbreadth away from the ischium, but not so loose as to allow impingement of the trochanter against the ischium, or of the prosthetic neck against the posterior socket. Open reduction and internal fixation of calcaneal fractures with a low profile titanium calcaneal perimeter plate. The reference array should be detected by the cameras both in the supine and ateral positions during the operation. Placing white adhesive tape with arrows onto the device helps patients remember how to turn the screws appropriately for angular, linear, and rotational correction. Care is taken not to drill into a previously placed nail or through the far cortex. When available, a pedobarograph may be useful for documenting pathologic foot stresses. Some ethnic groups (eg, Asians) have a propensity for higher degrees of anteversion, up to 30%. With the knee flexed 90 degrees, tension on the graft, and the foot externally rotated 30 degrees, the graft is secured to the intermuscular septum and the periosteum of the posterior lateral femoral condyle near the over-the-top position. Paralysis: Poliomyelitis and cerebral palsy as well as other nervous system afflictions in children typically result in shortening on the more affected side. Measurement of the Cobb angle on radiographs of patients who have scoliosis: evaluation of intrinsic error. Pass two cables through the lesser trochanter; these will later be used with a claw to fasten the native greater trochanter. Metaphyseal bone quality should be evaluated and intraoperative bone loss anticipated. This frequently avoids unnecessary trips back to the operating room in the postoperative period for loss of reduction.
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Instability of 25% to 50% indicates increased laxity but a still-competent retinaculum and medial patellofemoral ligament. The male nail also may be retrieved with an arthroscopic alligator clamp after the female nail is removed. These structures must be protected for the heel pad to maintain its sensation and viability. The joint line typically lies 25 mm distal to the femoral epicondyles, and the posterior femoral condyles are offset an average of 25. Curved or angled osteotomes are helpful to work the interface of the posterior condyles. In a different patient, gradual reduction with wires and provisional tightening are accomplished using a growing construct. The osteochondral defect of the capitellum (above) is identified along with the radial head (below). With the two heads combining, the muscle ascends laterally and posteriorly to insert in the mastoid process of the temporal bone. Care must be taken not to dissect excessively near the ulnar epiphysis, to prevent injury to the vascular supply to this area. Anterior, anterolateral, and direct lateral approaches have been associated with the lowest risk of dislocation. Adductor lengthening, psoas lengthening, open reduction of the hip with capsulorrhaphy, and acetabuloplasty may need to be considered. Arterial thrombosis due to tourniquet application, arterial kinking during knee manipulation, and direct, sharp injury to the artery have been described. Currently, the author uses somatosensory evoked potentials and transcranial electrical motor evoked potentials to evaluate the brachial plexus nerve function during surgery. Partial or complete release of the gluteus maximus insertion into the linea aspera can be performed at this time. The Salter innominate osteotomy: should it be combined with concurrent open reduction Role of innominate osteotomy in the treatment of congenital dislocation and subluxation of the hip in the older child. A bump is placed under the buttock to allow for visualization of the femoral neck and head on the lateral view radiograph. Stiff Steinmann pins are inserted in the proximal and distal femur to ensure that a proper amount of femoral rotation is provided. Antegrade versus retrograde titanium elastic nail fixation of pediatric distal-third femoral-shaft fractures: a mechanical study. After release of radial tethering tissue and rotation of flaps, the skin is sutured. The surgeon must be sure to engage both the medial and lateral columns of the distal fragment. Return to sports and active play is permitted at 3 months with the use of a functional knee brace for 2 years for cutting and pivoting activities. With the nail tip engaged in the epiphysis and the reduction complete, the stability of the fracture is assessed and the nail is left in situ. The central and inferior part of the acetabulum, the acetabular fossa, does not participate physiologically in transmission of weight force. Index distal interphalangeal flexion (flexor digitorum profundus index) and thumb interphalangeal flexion (flexor pollicis longus) are tested. A removable long-leg cast should be applied to maintain extension and to protect the tibia. Range-of-motion exercises also may begin immediately if the skin over the anterior knee is in good condition postoperatively and the incision has been closed with no tension. If careful preoperative templating was performed, this should result in restoration of leg length and offset with the implant system being utilized. If the preparatory surgery has not been performed and the Dega osteotomy is needed, it should be combined with excision of the fascia lata, superknee reconstruction, or both. Management of this injury component is essential to avoid iatrogenic surgical complications. Anteriorly, the fibers of the rectus femoris tendon traverse the patella and insert on the tibial tubercle inferior to the patella as the patellar tendon.
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When placing pedicle screws we prefer an exaggerated lateral trajectory to provide for better pullout strength. Comparison of the most recent radiograph with the oldest postoperative one is the most reliable way to document implant migration. A second drape is placed transversely above the level of the iliac crest, completing the isolation of the wound area from the abdomen and thorax. Bisphosphonates may improve bone stock, although this has not been proved in humans. Final fusion is performed near the end of the adolescent growth spurt or when the rods can no longer be lengthened. Therefore, the posterosuperior edge of the greater trochanter should be identified before the trochanteric osteotomy is performed, and it is of paramount importance that the osteotomy exit anterior to the posterosuperior edge of the greater trochanter. The entry point is just below the greater trochanteric apophysis if the patient is skeletally immature and through the greater trochanter after maturity. The modular prosthesis in situ, corresponding to the length of the resected specimen. The universal proximal femoral endoprosthesis: a short-term comparison with conventional hemiarthroplasty. The component should have an outer diameter 2 mm smaller than that of the final reamer, allowing for an adequate cement mantle. The muscles, in order of their importance, are the adductor longus, the gracilis, the proximal insertion of the hamstrings, and the iliopsoas. Incision for open reduction and internal fixation is made laterally over the anterior compartment, and the skin can then be mobilized to gain access to the fracture site. Place the skin incision for the portal over a rib to allow the portal to be placed above and below the rib (two portals per skin incision). Metal on metal surface replacement of the hip: Experience of the McMinn prosthesis. The most common type of scoliosis seen is idiopathic, in which the etiology and pathogenesis are unknown. Painless clicking can occur as the iliopsoas tendon snaps over the uncovered anterior femoral head, an occurrence that may be associated with dysplasia. These are proximal compensations for a hip dislocation and the resulting inadequate muscle strength to support the pelvis. Once the wedge can be inserted into the osteotomy cut, it is gently driven across the osteotomy to the desired correction. Intraoperative somatosensory evoked potentials, motor evoked potentials, and electromyography can be used to monitor for neurologic compromise and pedicle wall breach. Avoiding fibular stabilization, however, does not convincingly decrease and perhaps even increases the chance of angular deformity. It is prudent to advise both the parents and the operating room staff that a range of techniques from closed to open may be employed to obtain reduction. In this view, the patient has cartilage space remaining, but the medial compartment is narrowed. Tensile forces along the lateral border of the metatarsal result in a transverse fracture. This minimizes intra-pelvic extrusion and allows visualization of the floor of the acetabulum to guide placement of the acetabular component. The carcinomas that commonly metastasize to bone are those of the prostate, breast, kidney, thyroid, and lung. Accessory portals may be created higher or lower to the standard parapatellar portals if the lesion is excessively large or in an atypical location. Placement of pedicle screws at L5 can be difficult because the surgeon must direct the screws in an awkward trajectory. After dissection of the skin, the subcutaneous tissues should be carefully dissected to prevent injury to the saphenous vein and nerve. The ventral inclination angle can be measured by a line from the center of the femoral head to the anterior acetabular margin, and a vertical line from the center of the femoral head. Reduction of the dislocated body fragment may be attempted in the emergency room using radiographic information and conscious sedation. The medial cortex of the proximal fragment, graft, and distal fragment are flush with each other.
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The dissection is done using loupes for magnification and head lamps for illumination. If, because of the large segmental defect, tibial transport proximally is necessary, the fibula should also be osteotomized at the midshaft and a distal syndesmotic screw should be placed to prevent any proximal fibular migration. Patients with symptomatic femoroacetabular impingement who desire to maintain high activity levels often fail nonoperative management and desire surgical intervention. During splitting of the gluteus medius, attention must be paid to the nerve branch supplying the tensor fasciae latae, which crosses 3 to 5 cm cranial to the insertion. Note the near parallel orientation of the anterior and posterior (dashed line) acetabular walls. In the setting of a large varus thrust and significant varus deformity, the ligament reconstruction will fail. Once the osteotomy closes, the drill is passed through the medial malleolus in patients with a closed physis, securing the osteotomy. The proximal fragment tends to be abducted and externally rotated due to the pull of the rotator cuff musculature, while the shaft is adducted from the pull of the pectoralis major muscle. With severely deficient or absent proximal femoral bone, place the implant at the desired position during trial reduction. The second position is with the use of a four-poster frame, where the lower extremities are fairly parallel to the trunk. As opposed to the radial entry point, where a true incision is very important to allow protection of nerves and tendons, true percutaneous entry is an option for the anconeus starting point (distal to olecranon physis and just lateral off the ridge of the ulna). Fluoroscopic analysis of the kinematics of deep flexion in total knee arthroplasty. Fixation Each component should be cemented separately to prevent inadvertent changes in component position. Secondary effects on the extensor mechanism and patellofemoral joint may compound issues related to genu valgum, and patellar instability may ensue. Over the medial tibia, the medial collateral ligament is split longitudinally; over the lateral tibia, the anterior compartment muscles are left intact and the fibula is undisturbed. There is anterior forward slippage of the fifth lumbar vertebral body on the sacrum. Traditional spica casting with 90 degrees of hip flexion, 30 degrees of abduction, and 15 degrees of external rotation. Anterior cruciate ligament reconstruction autograft choice: bone-tendon-bone versus hamstring: does it really matter Clinical longitudinal standards for height, weight, height velocity, weight velocity, and stages of puberty. Typically, the diaphyseal deformity involves the mid- to distal shaft of the humerus when the guidewire is passed to the apex of angular deformity. During fracture healing, however, the majority of the blood is supplied by the periosteal circulation. The most anterior fibers of the gluteus medius muscle are divided (dashed line) as they insert on the vastus lateralis and greater trochanter. There is no evidence to support prophylactic fusion for asymptomatic high-grade isthmic spondylolisthesis. The connector can then be removed off the cranial rod, replaced by a longer connector, and slid onto the caudal rod again. This may be especially important if it preserves end-bearing without a prosthesis (eg, not having to put on a prosthesis to go from the bed to the bathroom). The posterior limb of the fascia lata graft is passed under the lateral collateral ligament. It is often helpful to think about pushing down on the proximal end of the shaft to correct the angulation while maintaining abduction to correct the varus. Care is necessary to prevent any damage to the common peroneal nerve, which is in close relationship with the biceps femoris. After the final position of the nails has been confirmed, the nails are backed out a few centimeters, cut to the proper length, and gently tapped back into their final position with the ends of the nail resting flush against the femur. Many important symptoms may not be readily volunteered by the patient, but must be sought by the orthopedist.
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Intraspinal anomalies associated with isolated congenital hemivertebra; the role of routine magnetic resonance imaging. If not, the pin can be inserted in the abducted position, but on moving the arm down, the skin will then be tented by the pin. The surgeon is looking from proximallateral to distal-medial along the Steinmann pin path in this figure. Activity restrictions, physical therapy, anti-inflammatory medicines, and intra-articular cortisone injections can be considered as potential nonoperative treatment options. With careful palpation through varying amounts of knee flexion, a point of maximal tenderness often can be located over the anterior medial aspect of the knee. The surgeon can actually place up to 25 to 30 degrees of anteversion on the femoral stem if necessary. A 13-year-old with myelokyphosis with diastasis beginning at T6 with 127 degrees of kyphosis. This approach has the advantage of preserving the posterior retinacular vessels, which reduces the possibility that an iatrogenic avascular state will develop postoperatively in the remaining femoral head. Thereafter, the various soft tissue layers are closed by running or single-stitch sutures. Next, using a blunt pin or straight instrument, mark on the skin the desired approach trajectory to the physeal bar. Once the bone graft and locked plate are inserted, the external fixator is removed. Insufficiency of hip abductors may require constrained acetabular implants or large-diameter femoral head components. The repair should be inspected carefully to make sure that the posterior flap is in contact with the femur, rather than hanging by suture or sutures, before the fascia is closed. Removal of the femoral stem may be necessary to gain unimpeded exposure of the acetabulum. Care must be taken to avoid injury to the deep motor branches of the peroneal nerve, just medial to the fibula. Associated bony congenital anomalies include Klippel-Feil syndrome, fused ribs, cervical ribs, congenital scoliosis, cervical spina bifida, hypoplastic clavicle, and short humerus. If it is difficult to assess the reduction because of absence of ossification of the femoral head, a small drop of contrast can be placed in the acetabulum. Despite claiming a 96% "satisfactory result," the authors describe only 25% of patients with locked flexion deformities experiencing improvement, and none recovering normal interphalangeal joint hyperextension. In most cases, with careful initial dissection, the plate can be covered completely. Preoperative Planning In many cases, the diagnosis of metastasis to the proximal femur will be made before a fracture occurs. Trendelenburg test is considered positive if pelvis on the nonstance side moves into a position of relative adduction; this may indicate abductor weakness or trochanteric nonunion. The table should allow good anterior and posterior views to be obtained with fluoroscopy. A favorable response may show a gradual conversion from a lytic to a blastic appearance as the pain decreases. The system calculates the perpendicular distance, from the most distal point to the resection plane (depth of cut). Previously, feeler gauges have been used to measure the gaps, because they do not stretch the ligaments. Pelvic obliquity can indicate a possible leg-length discrepancy that can mimic a lumbar scoliosis. On the initial examination the physician should note pain, motion, crepitus, deformity, soft tissue swelling, open fractures, and associated fractures of adjacent bones to the foot and ankle and should perform a complete neurovascular evaluation of the extremity. In these patients, all efforts at nonoperative treatment should be exhausted before an operation is considered, as it is known by natural history that the chance of progressive slippage is low. The cut is made carefully so that the saw is not inadvertently pushed past the posteromedial edge of the fibula with resultant injury to the peroneal artery.
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The preoperative range of motion also is assessed by the navigation system, which is more accurate and helps the surgeon plan different cuts, including femoral flexion and tibial slope. Initial imaging is performed to determine whether the patient has sustained a clinically significant physeal injury and therefore should demonstrate limb-length discrepancy and angular deformity. Offloading the mechanical axis into the lateral compartment that already is degenerated is a contraindication to the procedure. The actual plane of maximal radial head angulation depends on the forearm position of supination or pronation at the time of impact. Treatment of anterior femoroacetabular impingement with combined hip arthroscopy and limited anterior decompression. The role of intraoperative Gram stain in the diagnosis of infection during revision total hip arthroplasty. The graft diameter is sized and the graft is placed under tension with wet gauze around it. Cartilage intact but persistent pain and swelling Arthroscopic evaluation, search for loose bodies Consider drilling of lesion to stimulate subchondral bone healing. Longitudinal division of the A1 pulley with a 6700 Beaver blade under direct visualization. Alternatively, an opening wedge osteotomy may be performed about 2 to 3 cm proximal to the physis. Radiographs are position-sensitive, and care must be taken to obtain the films in neutral rotation. The outer cortex of the graft should be buried below the outer cortex of the ilium. On the first postoperative day, bed mobility and transfer training (ie, from bed to chair and from chair to bed) and bedside exercises (eg, ankle pumps, quadriceps sets, and gluteal sets) begin. Knee stability (rotatory) the rotatory stability of the knee joint is examined by internally and externally rotating the tibia on the distal femur in flexion and extension. The presence of concomitant injuries should be considered, as well as factors that may hinder or complicate treatment. In this patient, an external fixator was used for a grade 2 open fracture treated with delayed closure. At this time direct visual assessment of the femoral anteversion and part of the articular cartilage is possible, if the leg is externally rotated. The skin should be handled carefully and multiple punctures avoided to minimize soft tissue complications. Revision total knee arthroplasty with use of modular components with stems inserted without cement. The surgeon should accept less-than-perfect reduction in lieu of open reduction if possible to avoid the complications associated with an open approach. These injuries result from a combination of axial load, and dorsiflexion, plantarflexion, abduction, or adduction (or variable combinations thereof) of the midfoot. The hip is held in internal rotation, and the piriformis tendon is divided as close as possible to its insertion, along with the hip capsule. Significant metaphyseal comminution, open fractures, and bone loss are factors prone to causing healing problems; adjunctive measures should be considered in these cases. To avoid intrapelvic cement from a large medial defect, an "antiprotrusio" cement block can be made by shaping cement over an appropriate-sized reamer. Doing this eliminates slight tilting or subluxation that occurs with the nothumbs test and avoids an unnecessary lateral release. The overall limb alignment and knee motion are assessed while trackers are attached. There is a loss of anterior bow or a few degrees of recurvatum in many fractures after union, but again this has not been proved to be clinically relevant. Conversely, joint depression fractures require open reduction of the posterior facet.
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Acetabular necrosis: inferior branch of the superior gluteal artery and the acetabular branches, from inferior gluteal artery injuries Previous procedures increase the risk. If the foot remains in equinus with the knee flexed, there is shortening of the soleus or joint contracture or bony deformity. Care is taken to observe any irregularity in the articular catilage, discoloration of the articular cartilage, and impingement trough or indentation. The affected extremity is abducted 15 to 30 degrees to allow room for nail placement. Subperiosteal dissection at the superolateral pubic ramus protects the obturator nerve. Arthroscopic treatment of osteochondritis dissecans of the capitellum: report of 5 female athletes. They had good results in all but one case and considered the procedure to be minimally traumatic, cosmetically preferable, and safe. When performed as an isolated procedure, young children should be immobilized in a single-leg spica cast for about 6 weeks, when early radiographic evidence of healing is evident. This view will demonstrate the medial wall and show the relation of the superomedial fragment to the tuberosity. If prolonged immobilization is needed, immobilizing in extension is preferred, as flexion contractures are a more difficult problem to treat. Any significant deviation in the orientation of the blade plate in the coronal plane will result in unintended varus or valgus. Once an appropriate size has been determined, the leg is flexed and internally rotated to expose the proximal femur. In stable and unstable presentations, both knees should be examined to determine whether the condition is bilateral. In cerebellar involvement nystagmus, ataxia and incoordination are the common findings. The tendons are taken to the back table and excess muscle is removed by scraping with the side of a no. External rotatory instability is a common finding that is secondary to a contracted iliotibial band, which can lead to rotatory subluxation of the knee and patellar dislocation. The open technique, which is not described in this chapter, is performed the same way, with the following exceptions: A larger incision at the osteotomy or fracture site Retrograde guidewire placement and reaming of the proximal fragment Passing the wire into the distal femur under direct vision Guidewire Placement and Osteotomies in the Femur Short and long guidewires are available, depending on the length of the femur. Augmentation of paretic thumb abduction and extension can be accomplished by a combination of tenodesis and tendon rerouting or transfers and depends on the specific deficit, the muscles available, and the extent of voluntary control of selected muscles. Breach of the physeal cartilage barrier is most frequently caused by fracture, followed by infection. The pain may decrease with weight bearing as the component reseats itself and motion at the bone implant interface decreases. If insufficient correction is achieved or if the adjacent laminae abut prematurely, it may be necessary to resect further along the edges of the laminae. Once the nail properly enters the proximal fragment, the position is radiographically confirmed and the nail is rotated back toward its "entry trajectory. Tensile strength of the medial patellofemoral ligament before and after repair or reconstruction. The proximal, and particularly the distal, osteotomy fragments are wider than the graft, meaning that the lateral cortex of the graft is significantly more medial than the lateral cortices of the proximal and distal fragments. In another patient, three-dimensional contrast-enhanced computed tomography image of left posterior sternoclavicular dislocation. Rett Syndrome this is an X-linked disorder that affects females almost exclusively. If the lateral cortex has been breached, then either a staple or a 2- or 3-hole plate must be placed at the lateral cortex to restore stability to the lateral hinge. If full knee extension against gravity can be achieved immediately after surgery, use of a knee immobilizer is appropriate. Use care to preserve the posterior tibial artery and vein while dividing the posterior ankle capsule. Physical therapy is discontinued for 1 month to avoid fracture through the regenerate bone or a pin hole. Direct visualization of the joint and radiographic guidance should be critically evaluated. The Steinmann pin used to stabilize the calcaneus as part of the Boyd amputation can be extended further into the proximal tibia fragment to simultaneously stabilize the osteotomy site.
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Follow-up postoperative management requires a three-view plain radiographic ankle series. The second incision is a distal S incision that begins at the level of the lateral intramuscular septum on the side of the thigh and proximally at the level of the superior pole of the patella and extends to the lateral margin of the patellar tendon to the tibial tubercle. The severity of symptoms depends on the virulence of the organism, the overall health or comorbidities of the patient, and the status of the implants and surrounding soft tissues. Ultrasounds of dislocated right hip with alpha angle of 56 degrees (A) and normal left hip with alpha angle 66 degrees (B). The surgical stategy presented here has been used primarily for the treatment of cam-type deformities. Open reduction and internal fixation of isolated, displaced talar neck and body fractures. Cemented socket templating accounts for a 2-mm cement mantle in approximating the reamed hemispherical cavity. Many cases can be managed nonoperatively, but orthopaedists need to maintain familiarity with operative techniques. Detailed documentation of the talus fracture pattern and local soft tissue injury is paramount. Scoliotic curves measuring greater than 50 degrees are at higher risk for further progression during adult life (with a percentage of these progressing at a rate of about one degree per year). Results of thoracoscopic instrumented fusion versus conventional posterior instrumented fusion in adolescent idiopathic scoliosis undergoing selective thoracic fusion. Laterally the incision is 3 mm at the level of the physis and at the anterior border of the fibula. Alternatively, the wire can be manually pushed into the epiphysis if this provides better control and visualization with the C-arm. Although all are part of the same muscle group, their structure and function differ. Thawed fresh-frozen morselized cancellous allograft is introduced into the tibial canal and impacted tightly around the stem using either cannulated or standard tamps and a mallet. Median parapatellar approach to the knee can be done through a straight midline incision. Physical examination should include examination of previous incisions, sinus tracts, range of motion, leg-length discrepancy, neurovascular status, and contractures. The system used must span the length of the femur and tibia to achieve rigid fixation. The elbow is gradually flexed while applying anterior pressure on the olecranon (and distal condyles of the humerus) with the thumbs. Myelomeningocele Myelomeningocele, a congenital malformation of the nervous system, is due to a neural tube defect and results in a spectrum of sensory and motor deficits. The drop-leg test consists of lifting the lower extremity off the bed and fully extending the knee. Sources of potential or concurrent infection must be discovered, and proper evaluation and treatment should be performed well in advance of the surgical procedure. A dorsal approach to the thumb and a dorsoradial approach over the wrist is used for augmentation of thumb extensors, with a volar-radial approach being used for augmentation of the thumb abductor. Partially segmented hemivertebrae have much less growth potential (less than 1 degree per year), rarely exceeding 40 degrees at maturity. Spasticity is one of the primary causes of the series of events that ultimately leads to crouch. Closed treatment should be stopped if anatomic reduction of the tibia cannot be confirmed. If patellar tracking is not acceptable, the rotation of the femoral and tibial components must be carefully assessed and changed if necessary until the patella tracks well. The patient`s pain may be extrinsic (eg, lumbar radiculopathy, intrapelvic pathology), in which case revision surgery may fail to relieve pain completely. The arthroscope can be used to assess the portions of the capitellum not clearly visualized through the arthrotomy site, much like a dental mirror. Although the fracture hematoma can obscure distinct muscular planes, a tear in the aponeurosis of the brachioradialis may lead directly to the fracture site.