Retraction of the Torn Edge of the Rotator Cuff Affects by the Position of the Suprascapular Nerve

DOI
  • ABE Hidekazu
    Departmento f OrthopedicS urgery, A kita UniversityS choolo f Medicine
  • MINAGAWA Hiroshi
    Departmento f OrthopedicS urgery, A kita UniversityS choolo f Medicine
  • YAMAMOTO Nobuyuki
    Departmento f OrthopedicS urgery, A kita UniversityS choolo f Medicine
  • SEKI Nobutoshi
    Departmento f OrthopedicS urgery, A kita UniversityS choolo f Medicine
  • KIKUCHI Kazuma
    Departmento f OrthopedicS urgery, A kita UniversityS choolo f Medicine
  • ITOI Eiji
    Departmento f OrthopedicS urgery, A kita UniversityS choolo f Medicine
  • SASHI Ryuji
    Departmento f RadiologyA, kita UniversityS choolo f Medicine

Bibliographic Information

Other Title
  • 腱板断裂肩における肩甲上神経の走行

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Description

The purpose of this study was to determine the relationship between retraction of rotator cuff tear and the position of the suprascapular nerve. In 33 shoulders of 27 patients (mean age 61 years old) with and 10 shoulders of 10 patients (mean age 47 years old) without full-thickness tears of the supraspinatus tendon, we measured the position of the suprasucapular nerve on Ti-weighted coronal oblique images and the tear length on T2weighted coronal oblique images. We defined the retraction length as the longest distance from the lateral margin of the superior facet of the greater tuberosity and the torn edge of the tendon and the position of suprascapular nerve as the distance from the glenoid surface to the suprasucapular nerve using 3 images (anterior, middle, and posterior images of the supraspinous fossa). These data were evaluated using Pearson's correlation coefficient and the Mann-Whitney test. The distance from the glenoid surface to the suprascapular nerve was 24.0 ±3.7 mm in the anterior slice,19.7±2.6 mm in the middle slice and 14.3±3.4 mm in the posterior slice in the control group, whereas 25.1±3.9mm,19.9 ±3.8 mm and 13.5±2.9 mm respectively in the tear group. There was no significant difference between these groups. The correlation coefficient between the tear length and position of the suprascapular nerve was 0.50 (p<0.01) in the anterior slice,0.27 (p>0.05) in the middle slice, and 0.31 (p<0.05) in the posterior slice, but there was no significant difference among these slices. We concluded that retraction of torn tendon affects more displacement of motor branches than the trunk of the suprascapular nerve. The increased tautness in motor branches may place the nerve at risk of injury.

Journal

  • Katakansetsu

    Katakansetsu 30 (2), 269-272, 2006

    Japan Shoulder Society

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