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Clin Shoulder Elbow > Volume 14(1); 2011 > Article
Clinics in Shoulder and Elbow 2011;14(1):35-45.
DOI:    Published online June 30, 2011.
MR Evaluation of Tendinous Portions in the Subscapularis Muscle
Min Soo Shon, Kyoung Hwan Koh, Sung Sahn Lee, Jae Chul Yoo
Department of Orthopaedic Surgery, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.
견갑하근의 건 부분에 대한 자기공명영상을 이용한 분석
성균관대학교 의과대학 삼성서울병원 정형외과학교실
The purpose of this study was to document the structural features of the tendinous portions within the non-pathologic subscapularis muscle by performing high resolution MR imaging of the shoulder. MATERIALS AND METHODS: Between April 2007 and May 2010, we retrospectively obtained the MR scans of 88 consecutive young patients (88 shoulders) who were in their twenties. MRI and MR arthrography were performed using a 3.0-T system for the evaluation of glenohumeral instability and nonspecific shoulder pain. None of the patient in this study had any evidence of injury to the tendon or muscle belly of the subscapularis. On MR images, we recorded the transverse length of a stout tendinous band and the total tendinous portion of the subscapularis. In addition, we recorded the number of intramuscular tendinous slips of the susbscapularis.
The mean transverse length of the tendinous band was 15.0 mm (range: 8 to 20 mm). The mean transverse length of the total tendinous portion was 48.9 mm (range: 40 to 60 mm). The number of intramuscular tendinous slips on the base of the glenoid fossa was 3 in 20 (22.72%), 4 in 45 (51.14%) and 5 in 23 shoulders (26.14%). On the lateral portion, the intramuscular tendinous slips became gradually rounder and thicker and they gave converge in the superior direction.
In this study, the structural features of the tendinous portions of the subscapularis on the MR scans were identified. This will in return give good justification for the lines to be pulled during biomechanical stimulation and also for the surgical approach to restore the biomechanical function.
Key Words: Shoulder; Subscapularis; Tendinous; Band; Slips; MRI


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