Ten-Year Implant Survivorship and Performance of Anatomic Total Shoulder Arthroplasty Patients with the Zimmer Biomet Comprehensive® Shoulder System - a Short Stemmed Humeral Implant and Hybrid Glenoid.

Abstract

Background: Anatomic total shoulder arthroplasty are highly successful procedures for treatment of glenohumeral arthritis to reduce pain, improve range of motion, and overall quality of life. However, the long-term survivorship of the implant systems is less widely documented in the existing literature. The purpose of this study was to establish the long-term patient outcomes and identify factors influencing the postoperative implant survivorship of total anatomic shoulder arthroplasty devices/procedures utilizing the short-stemmed prosthesis and hybrid glenoid components of the Comprehensive Shoulder System (Zimmer Biomet, Warsaw, IN, USA) at an average of ten years.

Methods: Between 2007 and 2015, 159 shoulders in 128 unique patients were sequentially enrolled in the prospective, observational study following their anatomic total shoulder arthroplasty utilizing the Zimmer Biomet Comprehensive Shoulder System with the Mini Stem component and Modular Hybrid Glenoid component variation. Enrolled patients were clinically evaluated on an annual basis following their operation for up to ten years including a physical exam, radiographic evaluation, and patient outcomes via a modified Constant Score and satisfaction.

Results: The implant survival rate was 98.1% at ten years. The mean patient age was 70.4± 8.3 years (Range: 50.7-90.3 years) at the time of surgery. Average Constant Scores improved from preoperative to 6 months postoperative with an average of 81.55 ± 16.10 and 84.09 ± 15.12, respectively however there was a statistically significant longitudinal decline in Constant Score with increasing age for an average loss of 0.5 points per year. The overall revision rate for this cohort was 1.26% for a total of two revision cases secondary to external trauma and not implant system related.

Conclusion: Anatomic total shoulder arthroplasty with the Comprehensive Shoulder System had a high survivorship rate at the ten-year follow-up with improved clinical results postoperative. Patients had comparable long-term clinical results to the current longitudinal literature regarding survivorship of other implant systems.