Abstract
Patellar tendinopathy is characterized by activity-related anterior knee pain. It is most commonly related to sports activity, but has also been reported in the non-athletic population. Most injuries are caused by microtrauma, resulting in tendinitis or tendinosis. Extraskeletal paraarticular osteochondromas, which occur in the soft tissues near the joint, are rare. The infrapatellar fat pad and joint capsule are the most common sites of these tumors. Here, a case of patellar tendinitis caused by an extraskeletal paraarticular osteochondroma is reported. The symptoms included intensifying pain upon flexion and a palpable click that was located at the medial side of the mass. The patient was pain-free within 3 weeks after excision of the tumor and the clicking disappeared. To our best knowledge, no other case of patellar tendinitis caused by an extraskeletal paraarticular osteochondroma has been reported in the English literature.
Highlights
Patellar tendinopathy (PT) affecting the patellar or tibial insertion of the patellar tendon is one of the most common causes of anterior knee pain
We treated a patient with PT at the mid-portion of the patellar tendon that was caused by compression/impingement of an Extraskeletal paraarticular osteochondromas (ESPAOCs)
Extraskeletal paraarticular osteochondromas (ESPAOCs) are rare benign bone tumors that typically appear in the infrapatellar region
Summary
Patellar tendinopathy (PT) affecting the patellar or tibial insertion of the patellar tendon is one of the most common causes of anterior knee pain. Extraskeletal paraarticular osteochondromas (ESPAOCs) are rare benign bone tumors that typically appear in the infrapatellar region. Compression of the patellar tendon and increased thickness and signal of the patellar tendon were observed in axial fat-saturated proton density and sagittal fat-saturated T2weighted MRI images (Figure 3a, 3b, 3c). Patellar tendon thickening near to the tumor was observed and lateral side of the tendon was contoured due to compression by the oval mass (Figure 4). The osteochondral mass adjacent to patella in the left knee is seen at AP and lateral radiographs. TstpMFhirhoiRegoenutpiomtraonsetategted3lheloeaesncrhs(ptaioaetrytnredo(larlowa,anrlsb)mt)(ea(arncnsr)dsdoowsnas,itg)ihnitaictnrarelethfasaestersdneattaihuntiracaackxtuneialedulsmfTsa,t2ainstwsadtecusiogirgmhantpaelrdeosfThe osteochondral mass within the retinaculum, its compression to the patellar tendon, increased thickness and signal of the patellar tendon (arrows) are seen at axial fat saturated proton density (a, b) and sagittal fat saturated T2 weighted MR images (arrows) (c). There was no recurrence of the tumor and the patient was asymptomatic
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