MR Imaging of Bilateral Shoulders of Asymptomatic Collegiate Baseball Players

ISHII Takeo, MUKAI Naoki, MIYAKAWA Shumpei

doi:10.11296/katakansetsu.34.879

It is useful to know the condition of asymptomatic shoulders of baseball players in order to prevent throwing shoulder injury. But there are few reports about MRI of asymptomatic shoulders of baseball players. In this study, we investigated MRI findings of bilateral shoulders of asymptomatic collegiate baseball players.<BR>The subjects are 48 collegiate baseball players without symptoms. We compared the difference between throwing and non-throwing shoulders by MRI. The mean age of the playrers was 19.5(18-22) years old. The mean years of baseball experience were 10 ± 1.5 years. They underwent conventional MRI in adduction and in the ABER position. The following pulse sequences were used a) SE-T1WI b) FSE-T2WI. We assessed MRI signal abnormalities and deformities in their humeral head, glenoid, rotator cuff and subacrominal bursa.<BR>52% of their humeral heads of throwing side had abnormal findings more than the non-throwing side(11%). 65% of their glenoids of throwing side had abnormal findings more than non-throwing side(10%). 48% of their rotator cuff tendons of throwing side had abnormal findings more than non-throwing side(4%). 33% of subacrominal bursa of throwing side had abnormal findings more than non-throwing side(12%). The distribution and patterns of these findings were similar to those which have been reported as throwing injury in symptomatic shoulders.<BR>We think it is important to prevent throwing shoulder injury at an early stage because we could find lesions already in the asymptomatic phase.

MR Imaging of Bilateral Shoulders of Asymptomatic Collegiate Baseball Players

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