Authors: Seth A Jerabek Peter D Asnis Miriam A Bredella Hugue A Ouellette Steven K Poon Thomas J Gill
Publish Date: 2009/02/11
Volume: 38, Issue: 8, Pages: 785-790
Abstract
A retrospective billing database search identified 544 patients who had been diagnosed with patellar instability over a 13year period One hundred twentyeight patients met the inclusion criteria After review by a staff orthopedic surgeon and two musculoskeletal radiologists 28 patients were found to have medial patellar ossification The size and location of medial patellar ossification was recordedOf the 28 patients 20 males eight females age 13–66 years mean 28 years who were found to have medial patellar ossification 22 had radiographs 16 had magnetic resonance imaging and ten had both The medial patellar ossification ranged in size from 2 to 18 mm with an average of 68 mm Twelve were located in the medial patellofemoral ligament MPFL 14 in the medial joint capsule and two in both the MPFL and joint capsule Twentyseven of 28 patients had a single ossification and one patient had two ossifications The timing from injury to first imaging of the lesion ranged from 10 days to a chronic history ≥35 years of patellar instabilityMedial patellar ossification correlates with a history of prior patella subluxation and/or dislocation The medial ossification can be seen within the MPFL or the medial joint capsule suggesting remote injury to these structures The presence of this lesion will prompt physicians to evaluate for patellar instability
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