Proximal femoral intra-capsular osteoid osteoma in a 16-year-old male with epiphyseal periostitis contributing to Cam-type deformity relating to femoro-acetabular impingement

Autor: Anukul Panu, Dermot McNally, Sean Crowther, Marcus Pianta, Robert G. W. Lambert
Rok vydání: 2012
Předmět:
Zdroj: Skeletal Radiology. 42:129-133
ISSN: 1432-2161
0364-2348
Popis: Osteoid Osteoma was originally described in 1935 by Jaffe [1] , and is one of the most common benign bone tumours [2] , accounting for the majority of bone tumours in those under 25 years of age [3]. These are benign, osteoidproducing lesions for which nocturnal pain is markedly reduced or relieved by anti-inflammatories, typically salicylates. Males are affected more than females, at approximately a 3:1 ratio [4]. Typical imaging features include a central osteolytic nidus surrounded by sclerosis and adjacent periosteal reaction [2, 5, 6]. The most common location is the proximal femur [7], and the degree of bone edema can be variable. Rarely are osteoid osteomas intra-capsular, although they may then result in minimal periosteal reaction, marked synovitis or mimic other aetiologies, benign or malignant. When in the epiphyseal region, associated morphological changes include overgrowth, limb undergrowth and long term deformity [6, 8]. This can contribute to restricted range of motion and peri-articular deformity around a joint. Femoro-acetabular impingement is a well-recognised phenomenon, including Pincer and Cam mechanisms [9]. Whilst Pincer relates to acetabular rim contact with a normal femoral neck, Cam impingement is due to an abnormal buttress at the femoral head-neck junction contacting the normal acetabulum, both of which can contribute to patterns of labral tearing and cartilage degeneration [10]. An adolescent with an intra-articular osteoid osteoma of the femoral neck contributing to femoral head-neck junction periosteal new bone, resulting in a Cam-type deformity, has not previously been reported.
Databáze: OpenAIRE
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