title: Changes in hip and knee muscle strength in patients following total hip arthroplasty.
abstract: OBJECTIVE
  To investigate changes in hip and knee muscle strength in patients before and after total hip arthroplasty (THA) in comparison with that in healthy adults.
  
  
  METHODS
  The study included 21 women who underwent unilateral THA (THA group) and 21 age-matched healthy women (healthy group). Maximal isometric strengths of hip flexors, extensors, and abductors, and knee extensors and flexors were measured before surgery and at 4 weeks and 6 months after surgery.
  
  
  RESULTS
  Before surgery, muscle strength on both sides, except for hip flexors on the uninvolved side, was significantly lower in the THA group than the corresponding muscle strength in the healthy group. Up to 6 months after THA, strength of all muscle groups on both sides was significantly improved compared with their preoperative status, although the knee extensor strength on the involved side temporarily worsened at 4 weeks. However, the strength of hip extensors and knee extensors on the involved side, and hip abductors on both sides in the THA group remained below that in the healthy group.
  
  
  CONCLUSIONS
  Our results suggest that rehabilitation specialists should consider increasing the focus on the uninvolved side and encourage patients to continue strength training beyond 6 months after surgery.
authors: Faculty of Rehabilitation, Kobe Gakuin University, 518 Arise, Ikawadani-cho, Nishi-ku, Kobe 651-2180, Japan ; Human Health Sciences, Graduate School of Medicine, Kyoto University, 53 Kawahara-cho, Shogoin, Sakyo-ku, Kyoto 606-8507, Japan.
authors: Yoshihiro
authors: Y
authors: Fukumoto
authors: Human Health Sciences, Graduate School of Medicine, Kyoto University, 53 Kawahara-cho, Shogoin, Sakyo-ku, Kyoto 606-8507, Japan.
authors: Koji
authors: K
authors: Ohata
authors: Human Health Sciences, Graduate School of Medicine, Kyoto University, 53 Kawahara-cho, Shogoin, Sakyo-ku, Kyoto 606-8507, Japan.
authors: Rui
authors: R
authors: Tsukagoshi
authors: Department of Orthopedic Surgery, Kobe City Medical Center Central Hospital, 4-6, Minatojimanakamachi, Chuo-ku, Kobe 650-0046, Japan.
authors: Keiich
authors: K
authors: Kawanabe
authors: Department of Orthopedic Surgery, Graduate School of Medicine, Kyoto University, 54 Kawahara-cho, Shogoin, Sakyo-ku, Kyoto 606-8507, Japan.
authors: Haruhiko
authors: H
authors: Akiyama
authors: Department of Orthopedic Surgery, Takeda Hospital, 841-5 Shiokoji-cho, Shimogyo-ku, Kyoto 600-8558, Japan.
authors: Toshihiro
authors: T
authors: Mata
authors: Graduate School of Nursing, Kyoto Prefectural University of Medicine, 410 Nakagoryo-cho, Kamigyo-ku, Kyoto 602-0857 Japan.
authors: Misaka
authors: M
authors: Kimura
authors: Human Health Sciences, Graduate School of Medicine, Kyoto University, 53 Kawahara-cho, Shogoin, Sakyo-ku, Kyoto 606-8507, Japan.
authors: Noriaki
authors: N
authors: Ichihashi
keywords: Long-term Care; Muscle Strength; Rehabilitation Outcome; Total Hip Arthroplasty