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Start free with EleplanSinding-Larsen-Johansson disease
ORPHA:97337Disease
Also called Aseptic necrosis of patella · Osteochondrosis of patella
What it is
A rare osteochrondrosis characterized by chronic traction injury of the immature osteotendinous junction where the patellar tendon inserts into the inferior pole of the patella. It is typically seen in active adolescents. Patients present with point tenderness at the inferior pole of the patella associated with focal swelling and restriction of knee joint range of movement. Radiographic features include thickening of the proximal patellar tendon (potentially followed by dystrophic calcification and/or ossification) and fragmentation of the inferior pole of the patella.
Key facts
- Age of onset
- Adolescent, Childhood
- Inheritance
- Not applicable
- Classified as
- Disease
Signs and symptoms
These ranges are how often a sign appears across everyone diagnosed, not a prediction for one person — most people have some of these and not others. Orphanet also records findings that are specifically absent in this disease; those are in the data but not listed here.
ICD-10 codes
Cross-references
Orphadata Science: Free access data from Orphanet. © INSERM 1999. Data version 2026-06-23. Available under CC BY 4.0. This is a reference, not medical advice.
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