Comparisons Between Frail and Non-Frail Hospitalized Patients in Muscle Strength and Range of Motion After Hip Fracture Surgery: A Single-Blind Experimental Study

Frailty has emerged as a critical determinant of clinical outcomes in elderly patients, shaping postoperative recovery in crucial orthopedic events, such as hip fractures. The purpose of the present study is to examine the impact of frailty syndrome on muscle strength and joint range of motion in the non-fractured lower extremity and upper extremities of hospitalized older adults following hip fracture surgery. The sample consisted of 60 elderly patients recovering from either intracapsular or extracapsular hip fractures. Participants were categorized into either a frail or non-frail group, determined by the Clinical Frailty Scale. The outcome measures of muscle strength and range of motion of the upper and lower extremities were assessed by valid instruments, including a hand-held dynamometer, the Medical Research Council scale, and a digital goniometer. Statistical comparisons between groups were conducted using the independent samples t-test and the Mann–Whitney U test. The results showed that the non-frail group demonstrated greater active range of motion in the shoulder bilaterally (right: t = −2.85, left: U = 628.00, p < 0.05), elbow flexion bilaterally (right: U = 589.50, left: U = 592.50, p < 0.05), hip flexion (U = 679.50, p < 0.01), knee extension (t = −3.07, p < 0.05), and ankle dorsiflexion (t = −2.36, p < 0.05). Regarding the muscle strength, the non-frail group showed significantly higher grip strength bilaterally (right: U = 754.50, left: U = 713.50, p < 0.001), as well as greater strength in hip flexion (U = 641.00, p < 0.01) and ankle dorsiflexion (U = 619.50, p < 0.01). Frailty may negatively influence the muscle strength and joint mobility in non-fractured extremities, thereby hindering postoperative physical recovery in older adults with hip fractures. Further research involving a larger and more homogeneous sample may predict falls in elderly patients after hip or knee surgery using the Clinical Frailty Scale.