Radiographic-directed local coordinate systems critical in kinematic analysis of walking in diabetes-related medial column foot deformity.
Diabetic foot deformity onset and progression maybe associated with abnormal foot and ankle motion. The modified Oxford multi-segmental foot model allows kinematic assessment of inter-segmental foot motion. However, there are insufficient anatomical landmarks to accurately representation the alignment of the hindfoot and forefoot segments during model construction. This is most notable for the sagittal plane which is referenced parallel to the floor, allowing comparison of inter-segmental excursion but not capturing important sagittal hind-to-forefoot deformity associated with diabetic foot disease and can potentially underestimate true kinematic differences. The purpose of the study was to compare walking kinematics using local coordinate systems derived from the modified Oxford model and the radiographic directed model which incorporated individual calcaneal and 1st metatarsal declination pitch angles for the hindfoot and forefoot. We studied twelve participants in each of the following groups: (1) diabetes mellitus, peripheral neuropathy and medial column foot deformity (DMPN+), (2) DMPN without medial column deformity (DMPN-) and (3) age- and weight-match controls. The modified Oxford model coordinate system did not identify differences between groups in the initial, peak, final, or excursion hindfoot relative to shank or forefoot relative to hindfoot dorsiflexion/plantarflexion during walking. The radiographic coordinate system identified the DMPN+ group to have an initial, peak and final position of the forefoot relative to hindfoot that was more dorsiflexed (lower arch phenotype) than the DMPN- group (p<.05). Use of radiographic alignment in kinematic modeling of those with foot deformity reveals segmental motion occurring upon alignment indicative of a lower arch.
Program in Physical Therapy, Washington University School of Medicine, St. Louis, MO 63108, USA. Electronic address: hastingsmk@wustl.edu.
Mary K
MK
Hastings
Institute for Applied Health Research, Glasgow Caledonian University, Glasgow City, UK.
James
J
Woodburn
Program in Physical Therapy, Washington University School of Medicine, St. Louis, MO 63108, USA.
Michael J
MJ
Mueller
Department of Psychology, Washington University in St. Louis, MO 63130, USA.
Michael J
MJ
Strube
Department of Orthopaedic Surgery, Washington University School of Medicine, St. Louis, MO 63110, USA.
Jeffrey E
JE
Johnson
Program in Physical Therapy, Washington University School of Medicine, St. Louis, MO 63108, USA.
Krista S
KS
Beckert
Program in Physical Therapy, Washington University School of Medicine, St. Louis, MO 63108, USA.
Michelle L
ML
Stein
Program in Physical Therapy, Washington University School of Medicine, St. Louis, MO 63108, USA.
David R
DR
Sinacore
D001696:Biomechanical Phenomena; D003430:Cross-Sectional Studies; D017719:Diabetic Foot / Q000150:complications / Q000000981:diagnostic imaging* / Q000503:physiopathology*; D018450:Disease Progression; D005260:Female; D005528:Foot / Q000000981:diagnostic imaging / Q000503:physiopathology; D005530:Foot Deformities / Q000000981:diagnostic imaging* / Q000209:etiology / Q000503:physiopathology*; D005545:Forefoot, Human / Q000000981:diagnostic imaging / Q000503:physiopathology; D005684:Gait; D006801:Humans; D008297:Male; D008875:Middle Aged; D008954:Models, Biological; D011859:Radiography; D016138:Walking
Deformity; Diabetes; Foot; Model; Multi-segmental