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Does the proximal humeral bone quality influence alignment after reverse total shoulder arthroplasty with short humeral stems?

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Abstract

Purpose

When compared to standard-length humeral stem in reverse total shoulder arthroplasty (RTSA), short humeral stems in RTSA require good proximal humeral metaphyseal bone quality to gain proper and secure fixation during prosthetic implantation. Shorter humeral stems potentially carry more risk of misalignment than standard or long humeral stems. The hypothesis was that misalignment of the short humeral stems is influenced by regional bone quality.

Methods

RTSA with a short curved humeral stem with neck-shaft angle (NSA) default of 132.5° was reviewed. The study group included 35 cases at a mean age of 75.97 (± 6.23) years. Deltoid-tuberosity index (DTI) was measured to evaluate proximal humeral bone quality. The deltoid tuberosity index was measured at immediately above position of the upper end of the deltoid tuberosity. Stem alignment was given by the angle measured in degrees between the intramedullary humeral shaft axis and the axis of the humeral implant stem.

Results

The patient’s mean DTI was 1.37 ± 0.16 (median, 1.32; range, 1.12–1.80). 22 patients had poor bone quality (DTI < 1.4), compared to 13 patients with acceptable bone quality (DTI > 1.4). After RTSA, ten humeral components (29%) were neutrally aligned, whereas 25 humeral components (71%) were misaligned. There was no correlation between misalignment and DTI (r = 0.117; p = 0.504). But there was a strong correlation between misalignment and the patient’s own NSA (r = − 0.47; p = 0.004). The postoperative stem position and stem misalignment are not associated with functional outcomes (p > 0.05).

Conclusion

The misalignment of the short curved humeral stem frequently occurs. Poor reginal humeral bone quality does not influence misalignment after RTSA with a short humeral stem. Postoperative stem alignment is associated with the patient’s preoperative NSA and method of neck cut. The misalignment does not affect functional outcomes for midterm follow-up. Further long-term follow-up studies are needed to confirm its clinical relevance.

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Correspondence to Jinmyoung Dan.

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The study was performed in accordance with the ethical standards outlined in the 1964 Declaration of Helsinki and with the HIPAA regulation. The Institutional Review Board (IRB) of CHA Medical Center reviewed and approved the present retrospective single-center study (IRB No. GM 23-04).

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Lee, HJ., Kim, BK. & Dan, J. Does the proximal humeral bone quality influence alignment after reverse total shoulder arthroplasty with short humeral stems?. Eur J Orthop Surg Traumatol (2024). https://doi.org/10.1007/s00590-024-03909-7

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