A Positive Association Between Foot Posture Index and Medial Compartment Knee Osteoarthritis in Moroccan People

Abourazzak F.E*, 1, Kadi N1, Azzouzi H1, Lazrak F1, Najdi A2, Nejjari C2, Harzy T1
1 Rheumatology Department, Hassan II University Hospital, Fez, Morocco
2 Laboratory of Epidemiology and Public Health, Faculty of Medicine and Pharmacy, Fez, Morocco

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© Abourazzak et al.; Licensee Bentham Open.

open-access license: This is an open access article licensed under the terms of the Creative Commons Attribution Non-Commercial License ( which permits unrestricted, non-commercial use, distribution and reproduction in any medium, provided the work is properly cited.

* Address correspondence to this author at the Rheumatology Department, Hassan II University Hospital, Fez, Morocco; Tel: 00 212 6 61 60 18 14; Fax: 00 212 5 35 61 27 94; E-mail:


Objectives :

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.

Conclusion :

Pronated foot posture and flat foot are significantly associated with medial compartment knee osteoarthritis.

Keywords: Foot posture, foot posture index, knee osteoarthritis, medial arch, medial compartment, navicular height..