title: Pelvic instability and trunk and hip muscle recruitment patterns in patients with total hip arthroplasty.
abstract: Hip and lumbar spine disorders often coexist in patients with total hip arthroplasty (THA). The current study aimed to reveal pelvic motion pathology and altered trunk and hip muscle recruitment patterns relating to pelvic motion in patients with THA. Twenty-one women who underwent THA and 12 age-matched healthy women were recruited. Pelvic kinematics and muscle recruitment patterns (i.e., amplitude, activity balance, and onset timing) of the gluteus maximus, semitendinosus, multifidus, and erector spinae were collected during prone hip extension. Compared with healthy subjects, the patients showed increased pelvic motion, especially ventral rotation, decreased multifidus muscle activity relative to the hip extensors, and delayed onset of multifidus activity, despite reaction times and speeds of leg motion not being significantly different between the groups. Furthermore, while contributing factors associated with ventral pelvic rotation were not found, delayed onset of multifidus activity was detected as a factor related to the increased anterior tilt of the pelvis (r = 0.47, p < 0.05) in patients with THA. These results suggest that patients with THA have dysfunction of the stabilizer muscles of the lumbopelvic region along with increased pelvic motion.
authors.affiliation: Human Health Sciences, Graduate School of Medicine, Kyoto University, Kyoto, Japan. tateuchi@hs.med.kyoto-u.ac.jp
authors.forename: Hiroshige
authors.initials: H
authors.lastname: Tateuchi
authors.forename: Rui
authors.initials: R
authors.lastname: Tsukagoshi
authors.forename: Yoshihiro
authors.initials: Y
authors.lastname: Fukumoto
authors.forename: Haruhiko
authors.initials: H
authors.lastname: Akiyama
authors.forename: Kazutaka
authors.initials: K
authors.lastname: So
authors.forename: Yutaka
authors.initials: Y
authors.lastname: Kuroda
authors.forename: Noriaki
authors.initials: N
authors.lastname: Ichihashi
mesh_terms: D019644:Arthroplasty, Replacement, Hip; D005260:Female; D006621:Hip Joint / Q000503:physiopathology* / Q000601:surgery; D006801:Humans; D007593:Joint Instability / Q000503:physiopathology*; D008875:Middle Aged; D009119:Muscle Contraction; D018482:Muscle, Skeletal / Q000503:physiopathology*; D010388:Pelvis / Q000503:physiopathology*; D004856:Postural Balance; D011999:Recruitment, Neurophysiological; D013647:Task Performance and Analysis