title: Effect of post-trochanteric groove support on stance control associated with the pelvic-lumbar system: A preliminary study.
abstract: BACKGROUND
  Many stroke and neuromuscular patients with paraplegia or severe hemiparesis cannot control trunk balance.
  
  
  OBJECTIVE
  To support the pelvis/hip of paresis patients, a new pelvic/hip support system was developed bearing a convex pressing member placed over the post-trochanteric groove, a cutaneous landmark sited on the lateral portion of the gluteus maximus muscle and indicating the posterior aspect of the greater trochanter.
  
  
  METHODS
  Preliminary study.
  
  
  METHODS
  Stance control differences in two paretic patients (Guillain-Barré syndrome and stroke sequelae) with or without post-trochanteric groove support were examined. The contact pressure on the post-trochanteric groove was examined in eight healthy volunteers using an impact force sensor. The pelvic-lumbar movement was also examined using three-dimensional motion analysis, and the gluteus muscles activity was evaluated using surface electromyography.
  
  
  RESULTS
  Without post-trochanteric groove support, total three-dimensional displacement of the sacral marker was longer in the paresis patients than in normal controls, while post-trochanteric groove support decreased this distance. Post-trochanteric groove support provided compression pressure on the post-trochanteric groove, and all subjects showed a more upright trunk position, providing more anterior pelvic tilting. Six of eight subjects showed increased lumbar lordosis. Five of eight subjects showed gluteus maximus and/or gluteus medius muscle activation.
  
  
  CONCLUSIONS
  The mechanisms of post-trochanteric groove support were suggested to be spino-pelvic coordination and gluteal muscle activation.
  
  
  CONCLUSIONS
  The post-trochanteric groove is a cutaneous landmark located behind the pelvis/hip joint. Applying pressure to the post-trochanteric groove from behind pushes the trunk to adopt a more upright position, leading to improved stance control. Underlining mechanisms appear to be spino-pelvic coordination and gluteal muscle activation.
authors.affiliation: Department of Rehabilitation, Hibino Hospital, Hiroshima, Japan Department of Neurosurgery, Graduate School of Biomedical & Health Sciences, Hiroshima University, Hiroshima, Japan shama@hiroshima-u.ac.jp.
authors.forename: Seiji
authors.initials: S
authors.lastname: Hama
authors.affiliation: Ohtsubo Prosthetics and Orthotics MFG. Co., Yamaguchi, Japan.
authors.forename: Masafumi
authors.initials: M
authors.lastname: Ohtsubo
authors.affiliation: Institiute of Sport Science, ASICS Corporation, Hyogo, Japan.
authors.forename: Tsuyoshi
authors.initials: T
authors.lastname: Nishiwaki
authors.affiliation: Institiute of Sport Science, ASICS Corporation, Hyogo, Japan.
authors.forename: Ayu
authors.initials: A
authors.lastname: Miura
authors.affiliation: Department of Rehabilitation, Hibino Hospital, Hiroshima, Japan.
authors.forename: Mie
authors.initials: M
authors.lastname: Sanemasu
authors.affiliation: Department of Rehabilitation, Hiroshima University Hospital, Hiroshima, Japan.
authors.forename: Noboru
authors.initials: N
authors.lastname: Shimada
authors.affiliation: Department of Transportation and Environmental Engineering, Hiroshima University, Hiroshima, Japan.
authors.forename: Yukio
authors.initials: Y
authors.lastname: Fujimoto
authors.affiliation: Department of Rehabilitation, Hibino Hospital, Hiroshima, Japan.
authors.forename: Saori
authors.initials: S
authors.lastname: Tao
authors.affiliation: Department of Rehabilitation, Hibino Hospital, Hiroshima, Japan.
authors.forename: Takahiro
authors.initials: T
authors.lastname: Suzuki
authors.affiliation: Department of Rehabilitation, Hibino Hospital, Hiroshima, Japan.
authors.forename: Daisuke
authors.initials: D
authors.lastname: Hara
authors.affiliation: Department of Rehabilitation, Hibino Hospital, Hiroshima, Japan.
authors.forename: Eriko
authors.initials: E
authors.lastname: Iino
authors.affiliation: Department of Rehabilitation, Hibino Hospital, Hiroshima, Japan.
authors.forename: Shiori
authors.initials: S
authors.lastname: Kawahama
authors.affiliation: Department of Rehabilitation, Hibino Hospital, Hiroshima, Japan.
authors.forename: Daisuke
authors.initials: D
authors.lastname: Sato
mesh_terms: D000328:Adult; D004867:Equipment Design; D005260:Female; D020275:Guillain-Barre Syndrome / Q000150:complications / Q000503:physiopathology / Q000534:rehabilitation; D006621:Hip Joint / Q000503:physiopathology; D006801:Humans; D008159:Lumbar Vertebrae; D008297:Male; D008875:Middle Aged; D018482:Muscle, Skeletal / Q000503:physiopathology; D009989:Orthotic Devices; D010291:Paresis / Q000209:etiology / Q000503:physiopathology* / Q000534:rehabilitation*; D010388:Pelvis; D004856:Postural Balance / Q000502:physiology*; D011446:Prospective Studies; D016059:Range of Motion, Articular / Q000502:physiology; D020521:Stroke / Q000150:complications / Q000503:physiopathology; D000071939:Stroke Rehabilitation
keywords: Post-trochanteric groove; pelvic corset; pelvis–spine complex; static standing; stroke