Foot structure and function in older people with radiographic osteoarthritis of the medial midfoot.
OBJECTIVE
To investigate whether foot structure and dynamic foot function differ between older people with and without radiographically confirmed osteoarthritis (OA) of the talo-navicular joint (TNJ) and navicular-first cuneiform joint (N1(st)CJ).


METHODS
Dorso-plantar and lateral weighbearing foot radiographs (right feet) were obtained from 205 older people aged 61-94 years, and the presence of OA in the TNJ and N1(st)CJ was determined using a standardized atlas. Foot structure was assessed using a clinical measure (the arch index [AI]) and two radiographic measures (calcaneal inclination angle [CIA] and calcaneal-first metatarsal angle [C1MA]). Dynamic plantar pressure assessment during walking was undertaken using the Tekscan MatScan system.


RESULTS
Thirty-five participants exhibited radiographic OA in the TNJ and N1(st)CJ. There were no significant differences between the groups in relation to age, sex, weight or walking velocity. Compared to those without OA in these joints, those with OA had significantly flatter feet, as evidenced by larger AI (0.26+/-0.05 vs 0.25+/-0.05, P=0.02), smaller CIA (18.5+/-6.3 vs 21.3+/-5.4 degrees, P<0.01) and larger C1MA (137.0+/-9.3 vs 132.4+/-8.0 degrees, P<0.01), and exhibited significantly higher maximum forces in the midfoot (15.2+/-7.3 vs 11.2+/-7.0 kg, P<0.01; 36% increase).


CONCLUSIONS
Older people with radiographic OA of the TNJ and N1(st)CJ exhibit flatter feet and increased loading of the plantar midfoot when walking. Excessive loading of the midfoot may predispose to OA by increasing dorsal compressive forces, although prospective studies are required to confirm whether this relationship is causal.
Menz
H B
HB
Musculoskeletal Research Centre, Faculty of Health Sciences, La Trobe University, Bundoora, Victoria, Australia. h.menz@latrobe.edu.au
Munteanu
S E
SE
Zammit
G V
GV
Landorf
K B
KB
D000367:Age Factors; D000368:Aged; D000369:Aged, 80 and over; D005260:Female; D005413:Flatfoot / Q000000981:diagnostic imaging / Q000503:physiopathology; D033023:Foot Joints / Q000033:anatomy & histology / Q000000981:diagnostic imaging / Q000503:physiopathology*; D006801:Humans; D008297:Male; D008682:Metatarsal Bones / Q000033:anatomy & histology / Q000000981:diagnostic imaging / Q000503:physiopathology; D008684:Metatarsus / Q000033:anatomy & histology / Q000000981:diagnostic imaging / Q000503:physiopathology*; D010003:Osteoarthritis / Q000000981:diagnostic imaging / Q000503:physiopathology*; D011312:Pressure; D011859:Radiography; D016059:Range of Motion, Articular / Q000502:physiology; D012044:Regression Analysis; D012720:Severity of Illness Index; D016138:Walking / Q000502:physiology*; D016474:Weight-Bearing / Q000502:physiology