Primary hypertrophic osteoarthropathy and bilateral transient lateral patellar dislocation in an adolescent.

This case report is of the index case of bilateral transient patellar dislocation in a patient with primary hypertrophic osteoarthropathy. Primary hypertrophic osteoarthropathy is a rare complex disorder with variable presentation and thus frequently delayed diagnosis. Notably, this disease has multiple skeletal manifestations and, of relevance to this case, a proportion of patients suffer from osteitis.