Preoperative grip strength may predict shoulder strength after RSA
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Key takeaways:
- Preoperative grip strength positively correlated with shoulder strength and function after reverse shoulder arthroplasty.
- Measuring grip strength may allow surgeons to predict prognoses in these patients.
Published results showed preoperative grip strength positively correlated with shoulder strength and function after reverse shoulder arthroplasty and may work as a prediction tool for outcomes in these patients.
Researchers analyzed 58 patients (mean age of 73.4 years) who underwent primary RSA for cuff arthropathy, unrepairable cuff or osteoarthritis with a large cuff tear between 2016 and 2021. Average follow-up was 2 years.
They measured preoperative grip strength with a hydraulic dynamometer and appendicular relative skeletal muscle mass index with DXA. Postoperative outcomes included pain, range of motion, strength and function scores, according to the study.
In women, mean preoperative grip strength was 21.6 kg while mean appendicular relative skeletal muscle mass index was 5.98 kg/m2. In men, mean preoperative grip strength was 30.6 kg while mean appendicular relative skeletal muscle mass index was 7.21 kg/m2. Researchers noted no association between grip strength and appendicular relative skeletal muscle mass index.
At final follow-up, researchers found a positive correlation between grip strength and shoulder strength, as postoperative abduction shoulder strength and Constant-Murley shoulder scores “increased significantly” with increased preoperative grip strength. They also noted preoperative appendicular relative skeletal muscle mass index was positively correlated with American Shoulder and Elbow Surgeons scores at final follow-up.
“Although RSA is associated with high patient satisfaction, particularly in terms of reducing pain or elevating the arms, the recovery of shoulder strength is often unpredictable,” the researchers wrote in the study. “Measuring grip strength before RSA is important for evaluating skeletal muscle quality and allows the surgeon to predict patient prognosis after RSA,” the researchers concluded.
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