Mittelfristige Ergebnisse (4–8 Jahre) des schaftfreien Simpliciti-Schultersystems

Abstract

Background The stemless Simpliciti shoulder prosthesis has been available since 2010. To date, there are no scientific results on this type of prosthesis with a follow-up of more than 24–35 months. The aim of this retrospective study was to evaluate the clinical and radiological results of the Simpliciti shoulder system in a mid-term follow-up of 4–8 years. Material and methods Between April 2011 and December 2014, the Simpliciti shoulder system was implanted in 110 shoulders in 93 patients. After a mean follow-up of 72 (49–106) months, 98 shoulders (89.1%) in 93 patients with an average age of 72.7 years were available for clinical and radiological follow-up. There were 10 hemi-shoulder arthroplasties (HSA) and 88 total shoulder arthroplasties (TSA). Clinical examination, ultrasound of the rotator cuff, Subjective Shoulder Value (SSV), Quick-DASH (QDASH), Constant score (CS), range of motion, and radiographs were evaluated. Results All shoulders showed good clinical results. The mean SSV was 86% (HSA 79%, TSA 87%). The mean QDASH was 12 points (HSA 22, TSA 10). The mean CS improved from 32.2 to 75.4 ± 10.9 points (p < 0.005; HSA 70.4, TSA 76.0). The average age-adjusted CS was 89.7% ± 12.4% (HSA 82.1%, TSA 90.7%). The mean flexion was 141.4°, the mean abduction was 124.5°, and the mean external rotation was 47.2°. A pain reduction from 3.7 to 13.3 points in CS was achieved. Good anatomical reconstruction of the center of rotation and radius of curvature was evaluated in the postoperative radiographs. Bone resorption in unloaded bone of the humeral head was frequent but without any clinical impact. Conclusion The stemless Simpliciti shoulder prosthesis demonstrated very good clinical and radiological mid-term results, comparable to stemmed prostheses. Further follow-up is needed to determine the long-term results.