title: A positive association between foot posture index and medial compartment knee osteoarthritis in moroccan people.
abstract: OBJECTIVE
  To compare foot posture in people with and without medial compartment knee osteoarthritis (OA), and to assess association between its abnormalities and medial compartment knee OA.
  
  
  METHODS
  We compared the foot posture of patients with clinically and radiographically-confirmed medial compartment knee OA and asymptomatic healthy controls using the foot posture index (FPI), navicular height, and the medial arch.
  
  
  RESULTS
  We included 100 patients and 80 asymptomatic controls. The mean age of patients was 59 ± 7 (44-76) years and 48 ± 9 (28-60) years in the control (p=0.06). Patients group have more pronated foot for FPI (1.50 ± 2.68 vs 0.72 ± 2.63; p=0.05), more flat foot (42% vs 22%; p=0.03), and less pes cavus than the control group (58% vs 77%; p=0.004). However, there was no significant difference between the groups in the navicular height (3.90 ± 0.85 cm vs 4.00 ± 0.76 cm; p=0.41). In multivariate statistical analysis, after adjusting for age and body mass index, pronated foot in FPI (OR=1.22, 95%IC= [1.06-1.40], p=0.005), and pes cavus (OR=0.32, 95%IC= [0.11-0.93], p=0.03) had a significant correlation with the knee osteoarthritis.
  
  
  CONCLUSIONS
  Pronated foot posture and flat foot are significantly associated with medial compartment knee osteoarthritis.
authors.affiliation: Rheumatology Department, Hassan II University Hospital, Fez, Morocco.
authors.forename: Abourazzak
authors.initials: A
authors.lastname: F E
authors.affiliation: Rheumatology Department, Hassan II University Hospital, Fez, Morocco.
authors.forename: Kadi
authors.initials: K
authors.lastname: N
authors.affiliation: Rheumatology Department, Hassan II University Hospital, Fez, Morocco.
authors.forename: Azzouzi
authors.initials: A
authors.lastname: H
authors.affiliation: Rheumatology Department, Hassan II University Hospital, Fez, Morocco.
authors.forename: Lazrak
authors.initials: L
authors.lastname: F
authors.affiliation: Laboratory of Epidemiology and Public Health, Faculty of Medicine and Pharmacy, Fez, Morocco.
authors.forename: Najdi
authors.initials: N
authors.lastname: A
authors.affiliation: Laboratory of Epidemiology and Public Health, Faculty of Medicine and Pharmacy, Fez, Morocco.
authors.forename: Nejjari
authors.initials: N
authors.lastname: C
authors.affiliation: Rheumatology Department, Hassan II University Hospital, Fez, Morocco.
authors.forename: Harzy
authors.initials: H
authors.lastname: T
keywords: Foot posture; foot posture index; knee osteoarthritis; medial arch; medial compartment; navicular height.