Sling-based strength training improves functional recovery in older patients after total hip arthroplasty

Background Sling exercises are highly effective for strengthening core muscles and improving neuromuscular control while reducing joint strain. However, few studies have investigated the clinical effects of sling exercises on patients initiated up to 8 weeks after total hip arthroplasty (THA). Purpose This study was undertaken to investigate the effect of sling exercise on the functional recovery of patients after THA. Methods The observer-blinded trial was conducted on thirty older patients (≥ 65 years old) who had undergone THA. Participants were randomly and equally assigned to an experimental group (sling exercise program) or a comparison group (general exercise program). All participants received 30 min of comprehensive physiotherapy (5×/week for 4 weeks). In addition, the experimental group received sling exercises, and the comparison group received general exercises (5×/week for 4 weeks). Primary (stride lengths, stride times, stance times, and walking velocities) and secondary (pain scores and hip joint function scores) outcomes were measured before and after the 4-week training period. Results The experimental group achieved greater increases in stride length and walking velocity than the comparison group (stride length, +19.5 vs. + 10.3 cm, p < .008, 2 = .880; walking velocity, +11.7 vs. + 8 cm/s, p < .016, 2 = .274, respectively). However, changes in stride times, stance times, pain scores, and hip joint function scores after intervention were similar in the two groups. Conclusion Sling-based strengthening exercise may improve walking function recovery more than general exercise in older patients after total hip arthroplasty.