Clinical interpretation of asymptomatic medial collateral ligament injury observed on magnetic resonance imaging in adolescent baseball players
- 196 Downloads
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.
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).
‘Asymptomatic MCL injury on MRI’ had little correlation to ligament dysfunction. It might represent the transition period to MCL thickening called “adaptation.”
KeywordsBaseball elbow Magnetic resonance imaging Screening Asymptomatic elbow
- 13.Creighton RA, Bach BR Jr, Bush-Joseph CA. Evaluation of the medial elbow in the throwing athlete. Am J Orthop (Belle Mead, NJ). 2006;35(6):266–9.Google Scholar
- 14.Guilford JP. Fundamental statistics in psychology and education. New York: McGraw-Hill; 1965.Google Scholar
- 20.Suzuki T, Ito S, Handa S, Kose K, Okamoto Y, Minami M, Hayashi T, Goto D, Matsumoto I, Sumida T. A new low-field extremity magnetic resonance imaging and proposed compact MRI score: evaluation of anti-tumor necrosis factor biologics on rheumatoid arthritis. Mod Rheumatol. 2009;19(4):358–65.CrossRefPubMedPubMedCentralGoogle Scholar
- 22.Hoult DI, Richards RE. The signal-to-noise ratio of the nuclear magnetic resonance experiment. J Magn Reson. 1976;24:71–85.Google Scholar