Radiology Teaching Files > Case 1529978

Contributed by: Residents and Faculty Baptist Health System Birmingham Alabama, Radiologist, Baptist Health System Hospitals Birmingham, Alabama, USA.
Patient: female
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Findings: Well defined ovoid osteolytic lesion involving the postero- and superolateral aspect of the patella, extending to the subchondral bone plate. The lesion margin is somewhat sclerotic.
Diagnosis: dorsal patella defect
Discussion: Three lesions commonly affecting the patella include dorsal defect of the patella, osteochondritis dissecans and chondromalacia patellae. Chondromalacia patellae typically is confined to the cartilaginous portion of the patella and classically affects the ridge between the medial and odd facets of the bone. Osteochondritis dissecans is seen in both sexes usually between the ages of 15 and 20 years. It is typically located in the medial facet of the patella, in the middle to lower portion. The dorsal defect is located in the superolateral aspect of the patella. And is seen in approximately 1% of the population. It may be unilateral or bilateral. Assymptomatic or present with local pain and tenderness. It is "hot" on bone scan; generally regarded as a defect in [atellar ossification and may be related to multipartite patellae.
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Additional Details:

Case Number: 1529978Last Updated: 04-29-2005
Anatomy: Skeletal System   Pathology: Normal/Variants
Exam Date: Access Level: Readable by all users
Keywords: lytic lesion of patella, dorsal defect of the patella, osteochondritis dissecans, bony involvement with chondromalacia patellae, (rare), brodie's abscess (rare), chondroblastoma (rare), other lytic boACR: 453.139

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