Hip Extensor, Abductor, and External Rotator Strength in Preoperative Patients with Knee Osteoarthritis

Abstract

[Purpose] To obtain useful data for postoperative approaches to the hip muscles of patients with knee osteoarthritis (OA) undergoing unicompartmental knee arthroplasty. [Participants and Methods] Preoperative patients were divided into 2 age- and sex-matched groups: non-knee OA (18) and knee OA (17). For each patient, hip extensor, abductor, and external rotator strength measurements were performed twice using a hand-held dynamometer. [Results] The hip extensor and abductor muscle strength was significantly reduced in the knee OA group. On comparing the muscle strength between operative and nonoperative sides in the knee OA group, there were no significant differences in any of the 3 directions. [Conclusion] The hip muscle strength was suggested to bilaterally decrease in preoperative patients with knee OA.