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[Purpose] To clarify the process of lower limb muscle strength recovery in 2 weeks after total hip arthroplasty adopting the direct anterior approach. [Participants and Methods] Measurement was performed using a hand-held dynamometer in 17 participants to examine their lower limb muscle strength on the surgical side at the following points: before surgery, at 5, 7, 9, and 14 days after surgery, and on discharge. The measurement items were hip flexion, hip abduction in flexion, knee extension, and ankle dorsiflexion. [Results] There were no significant differences in values representing the hip flexor strength on the surgical side between before and the period from 5 days after surgery to discharge. In contrast, values representing the hip abductor strength in flexion on the surgical side were significantly lower at 5, 7, and 9 days after surgery than those before it. On comparing the values representing the hip abductor strength in flexion and hip flexor strength on the surgical side, the postoperative decrease was more marked in the former at 14 days after surgery and on discharge. [Conclusion] No recovery of the hip abductor strength in flexion on the surgical side was achieved even at 1 week after surgery, and the recovery rate was low immediately before discharge, indicating the necessity of physical therapy programs focusing on the hip abductor strength in flexion.

Lower Limb Muscle Strength Recovery in Two Weeks after Total Hip Arthroplasty Adopting the Direct Anterior Approach