A 3D surface imaging method to assess the weight-bearing foot arch deformation
ESSKA Academy. Ménard A. Nov 8, 2019; 284444; epESMA-38
Anne-Laure Ménard
Anne-Laure Ménard
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Introduction: Flexible flatfoot is a common foot deformation affecting up to 40% of the population and associated with painful conditions such as plantar fasciitis or metatarsalgia. Flexible flatfoot is characterized by a collapse of the medial longitudinal arch during weight-bearing. This condition can be clinically identified by 2D measurement of medial arch angle.
Objectives: The main objective was to develop and validate an innovative 3D measurement method to characterize the foot arch deformation under different weight-bearing conditions, in normal and flatfeet subjects.
Aims: The long-term outcomes would be to guide therapeutic strategies for foot arch rehabilitation in flexible flatfeet.
Methods: A total of 5 flatfeet and 5 matching normal subjects were recruited and tested under four weight-bearing conditions: 0%, 50%, 100% and 125% of body weight on the tested foot. A 3D surface imaging system (InSpeck Inc.) was used to obtain surface topography of the medial side of the foot and quantify the medial arch angle, arch height and volume. Medial arch angle was semi-automatically calculated between the centers of markers placed on the foot at three anatomical locations (heel, navicular bone, medial side of the first metatarsal bone). Plantar pressures (T&T, Medilogic) were acquired to quantify body weight distribution strategies.
Results: Medial arch angle was higher in flatfeet (147.6o±6.5o) versusnormal (141.8o±3.6o) subjects for the 0% body weight condition. In the flatfeet group, differences were found between non weight-bearing and all the weight-bearing conditions in terms of medial arch angle with 150.5o±6.3o, 151.5o±5.9oand 151.3o±5.2orespectively for 50%, 100% and 125% body weight. Among normal subjects, similar medial arch angle values were observed with 145.4o±4.8o, 142.2o±4.6oand 143.0o±4.6orespectively for 50%, 100% and 125% body weight. Interestingly, plantar pressures showed a lateral shift of body weight distribution in the 100% condition compared to both 50% and 125% in flatfeet subjects.
Conclusions: This preliminary study showed moderate collapse of the foot with increased body weight characterized by the medial arch angle. Plantar pressure data could suggest that the 100% body weight condition should be further investigated for rehabilitation purposes.
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