Kenta Tanaka1, Yoshikazu Okamoto2, Takeshi Makihara1, Kiyoshi Maehara3, Tomohiro Yoshizawa1, Manabu Minami4, Masashi Yamazaki1. 1. Department of Orthopaedic Surgery, Faculty of Medicine University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki, 305-8576, Japan. 2. Department of Radiology, Faculty of Medicine University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki, 305-8576, Japan. yokamoto@md.tsukuba.ac.jp. 3. Gradient School of Comprehensive Human Sciences, University of Tsukuba, Tsukuba, Ibaraki, Japan. 4. Department of Radiology, Faculty of Medicine University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki, 305-8576, Japan.
Abstract
PURPOSE: Magnetic resonance imaging (MRI) of medial collateral ligament (MCL) injury of the elbow was often observed in asymptomatic adolescent baseball players. We aimed to clarify the clinical interpretation of "asymptomatic MCL injury observed on MRI" by comparing MRI, ultrasonography (US), and physical findings. MATERIALS AND METHODS: Sixty-four asymptomatic adolescent baseball players (mean 11.2 years) were enrolled. An open-type 0.2T MRI was used. MCL function was evaluated by measuring the opening of the ulnohumeral joint using US. Physical findings included MCL tenderness, the moving valgus test, and the Milking test. The correlation between MRI and US, and MRI and physical findings were analyzed. RESULTS: Thirty-four subjects (53.1%) showed MCL injury by MRI. The mean laterality of the ulnohumeral joint opening showed no significant difference (P = 0.16) between the group with (0.29 ± 1.06 mm) and without (0.08 ± 0.96 mm) MCL injury on MRI. There was no correlation between MRI and physical findings except for a weak correlation between subjects with positive Milking test and MCL injury on MRI (φ coefficient = 0.3, P = 0.02). CONCLUSION: 'Asymptomatic MCL injury on MRI' had little correlation to ligament dysfunction. It might represent the transition period to MCL thickening called "adaptation."
PURPOSE: Magnetic resonance imaging (MRI) of medial collateral ligament (MCL) injury of the elbow was often observed in asymptomatic adolescent baseball players. We aimed to clarify the clinical interpretation of "asymptomatic MCL injury observed on MRI" by comparing MRI, ultrasonography (US), and physical findings. MATERIALS AND METHODS: Sixty-four asymptomatic adolescent baseball players (mean 11.2 years) were enrolled. An open-type 0.2T MRI was used. MCL function was evaluated by measuring the opening of the ulnohumeral joint using US. Physical findings included MCL tenderness, the moving valgus test, and the Milking test. The correlation between MRI and US, and MRI and physical findings were analyzed. RESULTS: Thirty-four subjects (53.1%) showed MCL injury by MRI. The mean laterality of the ulnohumeral joint opening showed no significant difference (P = 0.16) between the group with (0.29 ± 1.06 mm) and without (0.08 ± 0.96 mm) MCL injury on MRI. There was no correlation between MRI and physical findings except for a weak correlation between subjects with positive Milking test and MCL injury on MRI (φ coefficient = 0.3, P = 0.02). CONCLUSION: 'Asymptomatic MCL injury on MRI' had little correlation to ligament dysfunction. It might represent the transition period to MCL thickening called "adaptation."
Entities:
Keywords:
Asymptomatic elbow; Baseball elbow; Magnetic resonance imaging; Screening
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