Two-year clinical and radiographic outcomes following uncemented reverse shoulder replacements for proximal humerus fractures.

Background: Uncertainty remains regarding the role and long-term outcomes following uncemented reverse shoulder replacements (RSRs) in managing displaced proximal humeral fractures (PHFs). Although RSRs for trauma have traditionally undergone cemented fixation of the humeral component, there is increasing interest in uncemented RSRs. Our primary aim was to evaluate 2-year outcomes following uncemented RSR fixation for 3- and 4-part PHFs in the elderly. A secondary aim was to evaluate if timing of surgery affected outcomes.
Methods: This cohort series evaluated 2-year outcomes for 42 patients with Neer 3- and 4-part PHFs treated with uncemented RSRs between October 2016 and December 2019. Thirty-eight patients (90%) had clinical and radiologic follow-up at a minimum of 2 years. The primary outcomes compared postoperative range of movement, radiographic outcomes, and patient-reported outcome measures (PROMs). The PROMs collected included Oxford Shoulder Scores (OSSs), satisfaction scores, and the Friends and Family Test. The secondary outcome involved a subanalysis to see if outcomes were affected by treatment timing-within 2 weeks, 2-12 weeks, and >12 weeks.
Results: The mean age of patients was 74.1 years (range 58-89). There were 11 males and 31 females. No intraoperative fractures were sustained. There was 1 transient axillary neurapraxia, which fully resolved by 4 months. Three patients required postoperative transfusions. During the study follow-up period, no patients developed either deep infections requiring a washout or dislocation, and none underwent further surgery. At 2-year follow-up, radiologic follow-up demonstrated tuberosity union in 29 of 38 cases (76%). Eight of 38 patients (21%) demonstrated some glenoid notching (Sirveaux 1 or 2 only) on radiographic follow-up. There was no evidence of loosening. The mean OSS was 38 (range 15-48). Mean range of movement achieved at 2 years was as follows: forward flexion 122° (50°-180°), abduction 116° (46°-180°), and external rotation 25° (range 5°-60°). Eighteen patients (47%) described their result as excellent, 17 (45%) as good, and 3 (8%) as poor. When comparing the time from injury to treatment, there was no statistically significant difference in complications or radiographic outcomes between the groups. Patients had a reduced forward flexion when treated between 2 and 12 weeks compared with the other groups (P = .019).
Conclusion: Uncemented RSR is a safe treatment option for the management of complex PHFs in the elderly. We report low complication rates, high patient satisfaction, and good outcomes at 2-year follow-up.
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