title: Gait and lower limb muscle strength in women after triple innominate osteotomy.
abstract: BACKGROUND
  In adult patients with developmental hip dysplasia, a surgical procedure (triple innominate osteotomy) of the pelvic bone can be performed to rotate the acetabulum in the frontal plane, establishing better acetabular coverage. Although common clinical hip scores demonstrate significant improvements after surgery, they provide only overall information about function. The purpose of this study was to quantify the long-term outcome of triple innominate osteotomy in more detail using gait analyses and muscle strength measurements.
  
  
  METHODS
  We performed gait analyses at self-selected walking speed as well as isometric hip and knee muscle strength tests in twelve women who had undergone a unilateral triple innominate osteotomy (age: 34 ± 12 y, time post surgery: 80 ± 18 m). We compared the results to reference values obtained from eight healthy peers (age: 33 ± 10 y).
  
  
  RESULTS
  The patients exhibited slight asymmetries in step length (smaller steps) and stance time (longer stance) as well as lower hip abduction moments in the operated limb in early stance compared to the non-operated limb. However, there were no differences in gait compared to healthy controls, even though the patients showed reduced bilateral hip abduction strength compared to controls.
  
  
  CONCLUSIONS
  Our results indicate that the patients' gait pattern had generally recovered very well, despite slight asymmetries in spatiotemporal parameters. Subtle deviations in hip abduction moments were observed during gait, whereas hip abduction strength was substantially reduced. Hence, the patients walked at a higher percentage of their maximal capacity. They may, therefore, be prone to fatigue and adopt compensatory gait strategies more quickly than healthy peers when walking long distances.
authors.affiliation: Department of Rehabilitation, Donders Institute for Neuroscience, Radboud University Medical Center, P.O. Box 9101, 6500 HB, Nijmegen, The Netherlands. sjoerd.kolk@radboudumc.nl.
authors.forename: Sjoerd
authors.initials: S
authors.lastname: Kolk
authors.affiliation: Laboratory for Biomechanical Engineering, University of Twente, P.O. Box 217, 7500 AE, Enschede, The Netherlands. R.Fluit@utwente.nl.
authors.forename: René
authors.initials: R
authors.lastname: Fluit
authors.affiliation: Department of Rehabilitation, Donders Institute for Neuroscience, Radboud University Medical Center, P.O. Box 9101, 6500 HB, Nijmegen, The Netherlands. jmmluijten@msn.com.
authors.forename: Jim
authors.initials: J
authors.lastname: Luijten
authors.affiliation: Sint Maartenskliniek Research, Hengstdal 3, 6522 JV, Nijmegen, The Netherlands. P.heesterbeek@maartenskliniek.nl.
authors.forename: Petra J C
authors.initials: PJ
authors.lastname: Heesterbeek
authors.affiliation: Department of Rehabilitation, Donders Institute for Neuroscience, Radboud University Medical Center, P.O. Box 9101, 6500 HB, Nijmegen, The Netherlands. Sander.Geurts@radboudumc.nl.
authors.forename: Alexander C H
authors.initials: AC
authors.lastname: Geurts
authors.affiliation: Laboratory for Biomechanical Engineering, University of Twente, P.O. Box 217, 7500 AE, Enschede, The Netherlands. Nico.Verdonschot@radboudumc.nl.|Orthopaedic Research Laboratory, Radboud Institute for Health Sciences, Radboud university medical center, P.O. Box 9101, 6500 HB, Nijmegen, The Netherlands. Nico.Verdonschot@radboudumc.nl.
authors.forename: Nico
authors.initials: N
authors.lastname: Verdonschot
authors.affiliation: Department of Rehabilitation, Donders Institute for Neuroscience, Radboud University Medical Center, P.O. Box 9101, 6500 HB, Nijmegen, The Netherlands. Vivian.Weerdesteyn@radboudumc.nl.|Sint Maartenskliniek Research, Hengstdal 3, 6522 JV, Nijmegen, The Netherlands. Vivian.Weerdesteyn@radboudumc.nl.
authors.forename: Vivian
authors.initials: V
authors.lastname: Weerdesteyn
mesh_terms: D000328:Adult; D001696:Biomechanical Phenomena / Q000502:physiology; D016022:Case-Control Studies; D005260:Female; D005500:Follow-Up Studies; D005684:Gait / Q000502:physiology*; D006617:Hip Dislocation / Q000601:surgery*; D006621:Hip Joint / Q000502:physiology / Q000601:surgery; D006801:Humans; D007537:Isometric Contraction / Q000502:physiology; D035002:Lower Extremity / Q000502:physiology*; D008875:Middle Aged; D053580:Muscle Strength / Q000502:physiology*; D018482:Muscle, Skeletal / Q000502:physiology*; D010027:Osteotomy / Q000379:methods*; D010384:Pelvic Bones / Q000601:surgery*; D016059:Range of Motion, Articular / Q000502:physiology; D016896:Treatment Outcome; D016138:Walking / Q000502:physiology