HISTROTY: 15 year old male basketball player presented the sports medicine center for evaluation of bilateral knee pain for over 2 years. He was given a diagnosis of Osgood-Schlatters disease by his primary care physician but was sent for further evaluation with ongoing knee pain. The initital history and physical exam was consistent with a diagnosis of bilateral PFS and patellar tendonitis. The patient was sent to PT and asked to follow up in 4 weeks. At the subsequent visit the athlete noted near complete resolution of his left knee symptoms but continued to have pain and occasional swelling in his right knee. Closer questioning revealed an injury to his right knee 2 years prior. He could not recall the inciting event or specific details of the mechanism but he did see his school nurse and was diagnosed with a knee “sprain”. He noted swelling at the time but did not receive any treatment, x-rays, or further follow-up for this injury. The patient describes no locking or instability. PHYSICAL EXAM: General: Comfortable male. Inspection: Prominent tibial tuberosities bilaterally, no obvious effusion. Palpation: Minimal tenderness of the medial and lateral patellar facets. Medial joint line tenderness on the right. No tibial tubercle tenderness. Grade I effusion palpated. ROM: 0–140 degrees pain free ROM. Special Tests: Patellar grind test positive, Lachman's 1+ laxity on right but with firm end point, no laxity on left. Anterior/posterior drawer no laxity bilaterally. McMurray's Test positive with medial joint line pain on the right. DIFFERENTIAL DIAGNOSIS: Medial meniscal tear OCD Loose body Partial ACL tear TEST AND RESULTS: X-rays: A loose body was noted on right knee AP and lateral views near the intracondyler notch posteriorly. MRI: 2mm meniscal ossicle at the medial meniscal root. Attenuation of the root with mild medial meniscus subluxation was noted suggesting a chronic meniscal root tear. FINAL WORKING DIAGNOSIS Meniscal ossicle at the medial meniscal root. TREATMENT AND OUTCOMES Given the exam and MRI findings, the athlete was sent for arthroscopy. A separated loose body was not identified but a meniscal tear was noted as well as attenuation of the ACL consistent with partial tear. Partial medial menisectomy was performed. The athlete is asymptomatic and doing well at 4 week follow-up.
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