title: Foot pressure pattern and its correlation with knee range of motion limitations for individuals with medial knee osteoarthritis.
abstract: OBJECTIVE
  To determine the foot pressure pattern of individuals with medial knee osteoarthritis (OA) and to analyze its relation with knee flexion/extension range of motion.
  
  
  METHODS
  Descriptive.
  
  
  METHODS
  Rehabilitation center.
  
  
  METHODS
  Individuals with unilateral, painful medial knee OA (n=50; mean age, 75y; OA group) were enrolled as subjects, and young, healthy persons (n=50; mean age, 28y; young group) and elderly persons (n=44; mean age, 74y; elderly group) without any pain, deformity, or apparent OA changes in either knee were enrolled as controls.
  
  
  METHODS
  Walking 10m at a comfortable speed.
  
  
  METHODS
  Partial foot pressures as percentages of body weight (%PFP), anteroposterior length of the center of pressure (COP) path as a percentage of foot length (%Long), transverse width of the COP path as a percentage of foot width (%Trans), knee flexion/extension range of motion (in the OA group).
  
  
  RESULTS
  The %PFP values for the heel and hallux, %Long, and %Trans were all significantly lower in the OA group than in controls (P<.001, all). Within the OA group, a limited range of knee extension was significantly associated with a short %Long (P<.001) but not with %Trans.
  
  
  CONCLUSIONS
  Individuals with medial knee OA exhibited low pressure on the heel and hallux and short %Long of the COP path, and limitation of knee extension was associated with shortness of %Long. The shortness of %Long in the OA group likely resulted from insufficient knee extension during the heel-contact phase associated with low pressure on the heel. %Long is a useful parameter in gait analysis by using a foot pressure measurement system.
authors.affiliation: Department of Physical Therapy, Akita University Graduate School of Health Sciences, Akita City, Akita, Japan; Division of Rehabilitation, Ugo Municipal Hospital, Ugo Town, Akita, Japan. Electronic address: yochinoko@yahoo.co.jp.
authors.forename: Isao
authors.initials: I
authors.lastname: Saito
authors.affiliation: Department of Physical Therapy, Akita University Graduate School of Health Sciences, Akita City, Akita, Japan.
authors.forename: Kyoji
authors.initials: K
authors.lastname: Okada
authors.affiliation: Division of Orthopedic Surgery, Ugo Municipal Hospital, Ugo Town, Akita, Japan.
authors.forename: Tomio
authors.initials: T
authors.lastname: Nishi
authors.affiliation: Department of Physical Therapy, Akita University Graduate School of Health Sciences, Akita City, Akita, Japan.
authors.forename: Masahiko
authors.initials: M
authors.lastname: Wakasa
authors.affiliation: Department of Physical Therapy, Akita University Graduate School of Health Sciences, Akita City, Akita, Japan.
authors.forename: Akira
authors.initials: A
authors.lastname: Saito
authors.affiliation: Department of Physical Therapy, Akita University Graduate School of Health Sciences, Akita City, Akita, Japan; Department of Rehabilitation, Akita City Hospital, Akita City, Akita, Japan.
authors.forename: Kaori
authors.initials: K
authors.lastname: Sugawara
authors.affiliation: Department of Physical Therapy, Akita University Graduate School of Health Sciences, Akita City, Akita, Japan; Department of Rehabilitation, Akita Kumiai General Hospital, Akita City, Akita, Japan.
authors.forename: Yusuke
authors.initials: Y
authors.lastname: Takahashi
authors.affiliation: Department of Physical Therapy, Akita University Graduate School of Health Sciences, Akita City, Akita, Japan; Department of Rehabilitation, Sanno Orthopedic Clinic, Akita City, Akita, Japan.
authors.forename: Kazuo
authors.initials: K
authors.lastname: Kinoshita
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000704:Analysis of Variance; D016022:Case-Control Studies; D005260:Female; D005528:Foot / Q000033:anatomy & histology / Q000502:physiology*; D005684:Gait / Q000502:physiology; D006801:Humans; D007719:Knee Joint / Q000503:physiopathology*; D008297:Male; D008875:Middle Aged; D020370:Osteoarthritis, Knee / Q000503:physiopathology*; D011312:Pressure; D016059:Range of Motion, Articular / Q000502:physiology*; D016138:Walking / Q000502:physiology; D055815:Young Adult
keywords: %Long; %PFP; %Trans; COP; OA; Osteoarthritis, knee; Rehabilitation; TKA; Walking; center of pressure; osteoarthritis; partial foot pressure as a percentage of body weight; percentage of the anteroposterior length of the COP path to the foot length; percentage of the transverse width of the COP path to the maximum foot width; total knee arthroplasty