FENG Sijia 1,2 , CHEN Jun 1,2 , ZHANG Jian 1,2 , CHEN Shiyi 1,2
  • 1. Sports Medicine Institute, Fudan University, Shanghai, 200040, P.R.China;
  • 2. Department of Sports Medicine, Huashan Hospital Affiliated to Fudan University, Shanghai, 200040, P.R.China;
CHEN Shiyi, Email: cshiyi@163.com
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Objective To summarize the relationship between shoulder instability and superior labrum anterior posterior (SLAP) lesion. Methods The characteristics of shoulder instability and SLAP lesion were analyzed, and the relationship between them in pathogenesis, clinical symptoms, and biomechanics was discussed by referring to relevant domestic and foreign literature. Results Shoulder instability and SLAP lesion can occur both spontaneously and respectively. SLAP lesion destroys the superior labrum integrity and the long head of biceps tendon (LHBT) insertion, causing excessive humeral head displacement against glenoid, and leading to shoulder instability. While chronic repetitive or acute high-energy traumatic shoulder instability can in turn aggravate SLAP lesion, resulting in expansion and increased degree of the original lesion. Conclusion  SLAP lesion destroys mechanisms of shoulder stability, while shoulder instability causes tears of the upper labrum and the LHBT, showing a connection between the two. However, the existing evidence can only demonstrate that shoulder instability and SLAP lesion induce and promote the development of each other, instead of a necessary and sufficient condition. Therefore, the specific causal relationship between the two remains unknown and needs to be further studied.