1/6. Impingement simulation of the hip in SCFE using 3D models.OBJECTIVE: Affecting as it does the geometry of adolescent hips, slipped capital femoral epiphysis (SCFE) and its evaluation represent a major three-dimensional problem. The current methods of clinical assessment-geometric measurements of the femur on plain radiographs or on axial computed tomographic (CT) cross-sections-address only one of the two joint components. MATERIALS AND methods: We have developed a system to simulate motion of hip joints with physiologic joint contact. In our system, CT-based computer models of the femur, pelvis, etc., are fitted with oriented bounding boxes (OBBs) and manipulated. Collision detection algorithms control the hip motion, which, in this virtual joint, is based on the surface geometry of the joint partners rather than on a predefined fixed rotation center. RESULTS: An illustrative case is presented to show the advantages of the new biomechanical evaluation method over conventional radiological assessments for SCFE. The proposed system provides remarkably high speed, and the necessary data can be prepared in a reasonable time. CONCLUSION: The range-of-motion assessment provides the surgeon with information about the site and the impact of nonphysiologic contact in the hip joint. The information thus obtained can be valuable for indication and planning of corrective surgery in cases of SCFE.- - - - - - - - - - ranking = 1keywords = motion (Clic here for more details about this article) |
2/6. Intraarticular osteoid osteoma: clinical features, imaging results, and comparison with extraarticular localization.OBJECTIVE: Intraarticular osteoid osteoma is uncommon and presents diagnostic difficulties, which are important for both rheumatologists and orthopedic surgeons. Clinical symptoms, imaging procedures, differential diagnostic problems, and treatment results of intraarticular as compared with extraarticular osteoma are analyzed in this retrospective study. methods: Nineteen patients with intraarticular osteoid osteomas (Group A), with a mean followup period of 34 months, are compared with 15 others with extraarticular lesions (Group B). RESULTS: Nine intraarticular tumors were located in the hip, 3 in the elbow, 6 in the ankle, and one in the first metatarsal head. The nonspecific symptoms in Group A, such as chronic synovitis, decreased range of motion, joint effusion, contractures, and lack of the intense perifocal sclerotic margin on radiographs, led to significant delay in diagnosis (on average 26.6 mo in Group A, 8.5 mo in Group B). The extreme variety of previous diagnoses at referral reflect the problems of differential diagnosis. A detectable nidus is often absent on conventional radiograph. Bone scintigraphy is unspecific and often fails to visualize the nidus. Computed tomography scans were accurate in two-thirds of the intraarticular and in 90% of extraarticular cases. Magnetic resonance image findings, although sometimes controversial, provided essential additional information for the correct diagnosis and therapy. CONCLUSION: Clinical symptoms and imaging signs of intraarticular osteoid osteomas were significantly different from the classical hallmarks of extraarticular lesions. The 10% intraarticular occurrence of osteoid osteomas in this series is not as rare as some investigators suggest. The radiological and clinical findings are uncharacteristic and misleading, and the lesions are difficult to identify. Careful search for history data, such as nocturnal pain and positive salicylate test, in addition to extensive imaging procedures, led to the correct diagnosis prior to surgery in two-thirds of our patients with intraarticular osteoid osteomas.- - - - - - - - - - ranking = 0.33333333333333keywords = motion (Clic here for more details about this article) |
3/6. Unstable slipped capital femoral epiphysis: reduction by gradual distraction with external fixator. A case report.Severe unstable slipped capital femoral epiphysis (SCFE) usually requires some form of reduction before stabilization to avoid loss of motion and to prevent the development of early degenerative arthritis. Gentle manipulation and traction is being used to achieve reduction. The force applied with these techniques is uncontrolled and unpredictable, and may add to the pre-existing risk of avascular necrosis of the femoral head in such cases. The authors report a case of acute on chronic, severe, unstable SCFE in which reduction was satisfactorily achieved by gradual distraction using an external fixator across the hip joint. The patient did not show signs of avascular necrosis or chondrolysis at a follow-up of 38 months. Hip function was excellent with iowa hip score of 98 at the final follow-up.- - - - - - - - - - ranking = 0.33333333333333keywords = motion (Clic here for more details about this article) |
4/6. Differential diagnosis in physical therapy evaluation of thigh pain in an adolescent boy.Slipped capital femoral epiphysis (SCFE) is a condition of the adolescent hip in which the femoral head displaces relative to the femoral neck. This disorder is characterized by a synovitis of the hip joint or a mechanical limitation of motion with pain referred to the thigh or knee. The case described in this report is typical of an adolescent with SCFE. A brief review of epidemiology, etiology, clinical presentation, and treatment is presented to facilitate the physical therapist's knowledge of this condition and its proper management. Delay in diagnosis and treatment of SCFE may result in progression of the slip and chronic disability from osteoarthritis. It is imperative, therefore, that a patient suspected of having this condition be promptly referred to an orthopaedic surgeon for radiographic evaluation.- - - - - - - - - - ranking = 0.33333333333333keywords = motion (Clic here for more details about this article) |
5/6. Chondrolysis after slipped capital femoral epiphysis.Chondrolysis, or acute cartilage necrosis, is a controversial and perplexing complication of slipped capital femoral epiphysis (SCFE) in adolescents. It usually leads to deformity, pain, limping, and limitation of motion in the affected extremity. Although several theories have been proposed, no agreement has been reached as to the etiology or the pathogenesis of chondrolysis. Furthermore, no treatment program has been completely successful, and the general prognosis and natural history of this condition are not clear. An overview of the latest knowledge of the matter is presented.- - - - - - - - - - ranking = 0.33333333333333keywords = motion (Clic here for more details about this article) |
6/6. Fractures of the distal femoral epiphyses. Factors influencing prognosis: a review of thirty-four cases.In a review of thirty-four fractures through the distal femoral epiphyseal plate followed for an average of four years, limb-length discrepancy of 2.0 centimeters or more (measured roentgenographically) occurred in 36% and varus or valgus deformity measured as a difference of 5 degrees or more between the involved and uninvolved extremities occurred in 33%. Reconstructive procedures (osteotomy, epiphyseodesis, or both) were required in 20%. Limitation of knee motion (eleven patients), ligament laxity (eight patients), and quadriceps atrophy (five patients) were also observed. Prognoses made on the basis of the Salter-Harris classification alone were not reliable. The development of deformity appears to be related to the degree of initial displacement of the fracture, the exactness of the reduction, and the type of fracture.- - - - - - - - - - ranking = 0.33333333333333keywords = motion (Clic here for more details about this article) |