Investigation of site and frequency of asymptomatic injury in medial structures of the elbow in adolescent baseball play
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ORIGINAL ARTICLE
Investigation of site and frequency of asymptomatic injury in medial structures of the elbow in adolescent baseball players using dedicated magnetic resonance imaging Tomohiro Yoshizawa1 · Yoshikazu Okamoto2 · Takeshi Makihara1 · Kenta Tanaka1 · Takeshi Ogawa1 · Masashi Yamazaki1 Received: 28 July 2020 / Accepted: 23 September 2020 © Japan Radiological Society 2020
Abstract Purpose Medial epicondyle (ME) and elbow joint proximal (UCL-p) and distal ulnar collateral ligament (UCL-d) asymptomatic injuries are frequently observed using magnetic resonance imaging (MRI). However, the injury rates vary among these structures in elbow screening of adolescent baseball players, despite being adjacent medial structures of the elbow. This study aimed to retrospectively determine the actual injury site and rate, and investigate the underlying reason for discrepancies anatomically and biomechanically. Materials and methods Forty-four male adolescent baseball players were scanned using MRI. Two interpreters independently and retrospectively assessed the ME, UCL-p, and UCL-d injuries using the gradient echo axial, sagittal, and coronal planes. Results The injury prevalence was significantly higher in the ME and UCL-p (> 50% of the participants) than in the UCL-d (22.7%), P
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