title: Plantar pressure characteristics in hallux valgus feet.
abstract: Due to the pathoanatomical changes in hallux valgus feet, the plantar flexion moment of the first metatarsophalangeal joint is reduced. Therefore, load bearing of the hallux is decreased during push-off. We assessed loading parameters in hallux valgus feet. Based on dorsal-plantar weight bearing radiographs of 61 feet, the intermetatarsal-, hallux valgus-, distal metatarsal articulation-angle, and sesamoid position were evaluated. Plantar pressure assessment was performed with the emed® system during level walking. We found negative correlations between hallux valgus angle and peak pressure in the great toe (r=-0.301, p<0.023), the maximum force of the hallux (r=-0.481, p<0.001), and contact time of the great toe (r=-0.448, p<0.001), and positive correlations for force time integral (r=0.348, p<0.001), contact area (r=0.307, p<0.020), maximum force (r=0.430, p<0.001), and peak pressure (r=0.361, p<0.006) of the fifth metatarsal head. A positive correlation between the sesamoid and the metatarsal subluxation regarding maximum force (r=0.294, p<0.034), and a negative correlation between the contact area of the hallux (r=-0.232, p<0.020) was shown. Depending on the severity, hallux valgus angle, and sesamoid subluxation, load shows significant lateral transmission in hallux valgus feet.
authors.affiliation: Department of Orthopaedics, Vienna General Hospital, Medical University of Vienna, Waehringer Guertel 18-20, Vienna, 1090, Austria.
authors.forename: Ulrich
authors.initials: U
authors.lastname: Koller
authors.forename: Madeleine
authors.initials: M
authors.lastname: Willegger
authors.forename: Reinhard
authors.initials: R
authors.lastname: Windhager
authors.forename: Axel
authors.initials: A
authors.lastname: Wanivenhaus
authors.forename: Hans-Joerg
authors.initials: HJ
authors.lastname: Trnka
authors.forename: Reinhard
authors.initials: R
authors.lastname: Schuh
mesh_terms: D000328:Adult; D000368:Aged; D005260:Female; D005528:Foot / Q000503:physiopathology*; D006215:Hallux Valgus / Q000503:physiopathology*; D006801:Humans; D008297:Male; D008875:Middle Aged; D011312:Pressure
keywords: hallux valgus; plantar pressure distribution