Biomechanical comparison of lesser tuberosity osteotomy versus subscapularis tenotomy in total shoulder arthroplasty

Steven A. Giuseffi, Prasit Wongtriratanachai, Hiromichi Omae, Akin Cil, Mark E. Zobitz, Kai Nan An, John W. Sperling, Scott P. Steinmann

Research output: Contribution to journalArticle

45 Scopus citations

Abstract

Background: Total shoulder arthroplasty is traditionally performed through an anterior deltopectoral exposure with subscapularis tenotomy. Postoperative subscapularis dysfunction is common and adversely affects clinical outcomes. Consequently, surgeon interest in lesser tuberosity osteotomy has grown in an effort to improve subscapularis repair strength. This study investigated the biomechanical strength of subscapularis tenotomy vs lesser tuberosity osteotomy in the setting of total shoulder arthroplasty. Materials and methods: Uncemented humeral prostheses were placed in 20 paired upper extremities from 10 cadavers. For each respective cadaver, 1 limb underwent lesser tuberosity osteotomy and the contralateral limb underwent subscapularis tenotomy. The cadaveric specimens then underwent cyclic displacement and maximum load to failure testing. Results: The subscapularis tenotomy specimens exhibited significantly less cyclic displacement (0.8 mm) than the osteotomy group (1.8 mm), with a 95% confidence interval (CI) for the difference of 0.5 to 1.5 mm (P = 0.002). The maximum load to failure was 439 ± 96 N for tenotomy and 447 ± 89 N for osteotomy (95% CI for the difference of -58 to 75), which was not significant (P = .78). Conclusion: Lesser tuberosity osteotomy was not significantly stronger than subscapularis tenotomy in maximum load to failure testing, with minimal clinical significance set at 100 N. Subscapularis tenotomy repair showed statistically significant less cyclic displacement than lesser tuberosity osteotomy. Further research is needed to clarify how the biomechanical results immediately after subscapularis tenotomy and lesser tuberosity osteotomy correlate with clinical outcomes.

Original languageEnglish (US)
Pages (from-to)1087-1095
Number of pages9
JournalJournal of Shoulder and Elbow Surgery
Volume21
Issue number8
DOIs
StatePublished - Aug 1 2012

Keywords

  • Lesser tuberosity osteotomy
  • Subscapularis tenotomy
  • Total shoulder arthroplasty

ASJC Scopus subject areas

  • Surgery
  • Orthopedics and Sports Medicine

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    Giuseffi, S. A., Wongtriratanachai, P., Omae, H., Cil, A., Zobitz, M. E., An, K. N., Sperling, J. W., & Steinmann, S. P. (2012). Biomechanical comparison of lesser tuberosity osteotomy versus subscapularis tenotomy in total shoulder arthroplasty. Journal of Shoulder and Elbow Surgery, 21(8), 1087-1095. https://doi.org/10.1016/j.jse.2011.07.008