Muscle Deflection Used as an Assessment Indicator of the Rehabilitation Quality After Total Hip Joint Arthroplasty (THA)

Background/Objectives: Total hip joint arthroplasty (THA) is a common procedure aimed at alleviating pain and restoring mobility in patients with severe hip joint conditions, particularly osteoarthritis. While the surgery itself is effective, postoperative rehabilitation is crucial for long-term functional recovery. This study investigates the role of muscle deflection as an indicator of rehabilitation quality, focusing on hip movement improvements (abduction, extension, and flexion) over an 8-week recovery period. The objective is to assess whether muscle deflection measurements can serve as reliable metrics for evaluating recovery progress and functional outcomes. Methods: The study involved post-THA patients from Euroclinic Hospital S.A. and Bucharest Emergency Clinical Hospital, who were divided into an experimental group (undergoing a specialized rehabilitation program) and a control group (receiving standard recovery protocols). Measurements of active range of motion (AROM), passive range of motion (PROM), and muscle deflection were taken using a handheld digital dynamometer (ActivForce 2) at different time points (2, 4, 6, and 8 weeks post-surgery). The Western Ontario and McMaster Universities Osteoarthritis Index (WOMAC) was also used to assess pain, physical difficulties, and joint stiffness. Results: The study found progressive improvements in AROM, PROM, and muscle deflection across all movements over the 8-week period. Conclusions: The findings highlight the importance of structured physiotherapy in post-THA rehabilitation. The use of muscle deflection measurements provides an objective and quantifiable method for tracking patient progress. Future rehabilitation protocols could benefit from incorporating muscle deflection monitoring to tailor recovery programs and optimize patient outcomes. Standardizing rehabilitation exercises, including balance training and resistance exercises, may further enhance recovery and reduce long-term functional impairments.