Seo Joongbae, Yang Jongheon, Heo Kang, Yoo Jae-Sung
Department of Orthopaedic Surgery, Dankook University College of Medicine, Manghyangro 201, Dongnam-gu, Cheonan, Chungnam 330-715 Republic of Korea.
Indian J Orthop. 2020 Jan 24;54(3):366-373. doi: 10.1007/s43465-019-00020-6. eCollection 2020 May.
It remains unclear whether the deep layer of the rotator cuff is an articular layer of the supraspinatus (SS) or infraspinatus (IS), rotator cable, or superior capsule. Therefore, this study aimed to analyse the relationship between occupation ratios and delamination patterns of rotator cuff tears (RCTs). We hypothesised that the deep layers are related to the occupation ratios of the deep SS and IS sections.
A total of 265 patients with RCTs were retrospectively enrolled between 2013 and 2017 and divided into four groups: A, non-delaminated tear; B, delaminated tear with the deep layer equally retracted to the superficial layer; C, delaminated tear with the deep layer more retracted; D, delaminated tear with the superficial layer more retracted. Muscle volume was evaluated by measurement of each occupation ratio of the SS and IS, and the IS muscle was additionally divided into two areas, deep and superficial.
The SS occupation ratio was significantly lower in group C than in the other groups ( = 0.009). Conversely, comparison of the IS occupation ratios revealed no significant intergroup differences. The occupation ratio of the superficial IS was significantly lower in group D than in the other groups ( = 0.003). In group C, the occupation ratios of the deep IS section were significantly decreased according to RCT size ( = 0.034).
Our findings demonstrate that the superficial layers are related to the IS superficial section and the deep layers to the SS and IS deep sections.
IV.
目前尚不清楚肩袖深层是冈上肌（SS）或冈下肌（IS）的关节层、旋转索还是上关节囊。因此，本研究旨在分析肩袖撕裂（RCT）的分层模式与占比之间的关系。我们假设深层与SS和IS深层的占比有关。
回顾性纳入2013年至2017年间的265例RCT患者，并将其分为四组：A组，非分层撕裂；B组，分层撕裂且深层与浅层同等回缩；C组，分层撕裂且深层回缩更多；D组，分层撕裂且浅层回缩更多。通过测量SS和IS的各自占比来评估肌肉体积，并且将IS肌肉额外分为深层和浅层两个区域。
C组的SS占比显著低于其他组（ = 0.009）。相反，IS占比的组间比较未显示出显著差异。D组的浅层IS占比显著低于其他组（ = 0.003）。在C组中，深层IS部分的占比根据RCT大小显著降低（ = 0.034）。
我们的研究结果表明，浅层与IS浅层部分相关，而深层与SS和IS深层部分相关。
IV级。
