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Osteochondromas, or exostoses, are overwhelmingly found as isolated lesions although they can be present within the context of multiple hereditary exostosis. Increased exostotic load associated with multiple hereditary exostosis can lead to limb-length discrepancy, increased femoral anteversion, valgus angulation, and acetabular dysplasia. Solitary osteochondromas have been linked with bursal inflammation and pain, compression on neurovascular structures, and malignant degeneration, groin and lower extremity pain.

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Solitary osteochondroma of the proximal femur and femoral acetabular impingement.

Orthopedics

January 2010

Department of Orthopedic Surgery and Rehabilitation, University of Chicago, 5841 S Maryland Ave, MC-3079, Chicago, IL 60637, USA.

Although osteochondromas can be present within the context of multiple hereditary exostosis, these tumors are overwhelmingly found as isolated lesions. Increased exostotic load associated with multiple hereditary exostosis can lead to limb-length discrepancy, increased femoral anteversion, valgus angulation, and acetabular dysplasia. Despite these observations, the relationship of more common isolated exostoses near the proximal femur and their role in femoral acetabular impingement has never been depicted.

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We reviewed the cases of twenty-four patients with solitary or multiple exostoses to correlate their radiographic, scintigraphic, and histological evaluations. We studied twenty-five excised lesions, two of them exostotic chondrosarcomas, from twenty-two patients. There were two patterns of bone-scan activity and there was a direct correlation between enchondral bone formation and radionuclide uptake in all patients, both skeletally immature and mature.

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