Morphology of the torn rotator cuff

E. Itoi, H. C. Hsu, S. W. Carmichael, B. F. Morrey, K. N. An

研究成果: Article同行評審

41 引文 斯高帕斯(Scopus)

摘要

The morphological characteristics of shoulders with torn rotator cuffs were determined using 41 embalmed specimens. The following parameters were measured in the supraspinatus (SSP), infraspinatus (ISP) and subscapularis (SSC) muscles: the length, thickness and width of the extramuscular tendon; the length of the intramuscular tendon; the length and width of a tear, if present, muscle fibre length; and muscle volume. The cross-sectional area (CSA) of the tendon was measured on the photographic image of slices of the tendon using an image analysis system, and the CSA of the muscle was calculated by dividing the muscle volume by muscle fibre length. The rotator cuff was intact in 11 shoulders. A partial-thickness tear of the cuff was present in 12 shoulders, a full-thickness tear of the SSP in 11 shoulders, and a full-thickness tear of more than 2 tendons in 7. Overall incidence of full-thickness tears of the rotator cuff was 44%, and that of partial-thickness tears 29%. With increase of tear size, the functional tendon length (extramuscular tendon length plus tear length) increased by a statistically significant amount in the SSP, ISP and SSC, whereas muscle fibre length decreased in SSP and ISP. It is concluded that the increased functional tendon length and decreased muscle fibre length are the main morphological changes that make the rotator cuff a physiologically abnormal unit. Surgical repair of the torn cuff would be expected to improve these anatomical changes and restore the kinetics of the glenohumeral joint. Our data encourage early repair of rotator cuff tears at a stage when these anatomical changes are still reversible in patients, such as manual labourers and athletes, who need functional shoulders.

原文English
頁(從 - 到)429-434
頁數6
期刊Journal of Anatomy
186
發行號2
出版狀態Published - 1995

All Science Journal Classification (ASJC) codes

  • 解剖學
  • 組織學
  • 生態學、進化論、行為學與系統學
  • 分子生物學
  • 發展生物學
  • 細胞生物學

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