The relationship of foot and ankle mobility to the frontal plane projection angle in asymptomatic adults

Wyndow, Narelle, De Jong, Amy, Rial, Krystal, Tucker, Kylie, Collins, Natalie, Vicenzino, Bill, Russell, Trevor and Crossley, Kay (2016) The relationship of foot and ankle mobility to the frontal plane projection angle in asymptomatic adults. Journal of Foot and Ankle Research, 9 1: . doi:10.1186/s13047-016-0134-9

Author Wyndow, Narelle
De Jong, Amy
Rial, Krystal
Tucker, Kylie
Collins, Natalie
Vicenzino, Bill
Russell, Trevor
Crossley, Kay
Title The relationship of foot and ankle mobility to the frontal plane projection angle in asymptomatic adults
Journal name Journal of Foot and Ankle Research   Check publisher's open access policy
ISSN 1757-1146
Publication date 2016-01-25
Sub-type Article (original research)
DOI 10.1186/s13047-016-0134-9
Open Access Status DOI
Volume 9
Issue 1
Total pages 7
Place of publication London, United Kingdom
Publisher BioMed Central
Collection year 2017
Language eng
Formatted abstract
The frontal plane projection angle (FPPA) is frequently used as a measure of dynamic knee valgus during functional tasks, such as the single leg squat. Increased dynamic knee valgus is observed in people with knee pathologies including patellofemoral pain and anterior cruciate injury. As the foot is the primary interface with the support surface, foot and ankle mobility may affect the FPPA. This study investigated the relationship between foot and ankle mobility and the FPPA in asymptomatic adults.

Thirty healthy people (aged 18–50 years) performed 5 single leg squats. Peak FPPA and FPPA excursion were determined from digital video recordings. Foot mobility was quantified as the difference in dorsal midfoot height or midfoot width, between non-weightbearing and bilateral weightbearing positions. Ankle joint dorsiflexion range was measured as the maximum distance in centimetres between the longest toe and the wall during a knee-to-wall lunge. Linear regressions with generalised estimating equations were used to examine relationships between variables.

Higher midfoot width mobility was associated with greater peak FPPA (β 0.90, p < 0.001, odds ratio [OR] 2.5), and FPPA excursion (β 0.67, p < 0.001, OR 1.9). Lower midfoot height mobility was associated with greater peak FPPA (β 0.37, p = 0.030, OR 1.4) and FPPA excursion (β 0.30, p = 0.020, OR 1.3). Lower ankle joint dorsiflexion was also associated with greater peak FPPA (β 0.61, p = 0.008, OR 1.8) and greater FPPA excursion (β 0.56, p < 0.001, OR 1.7).

Foot and ankle mobility was significantly related to the FPPA during the single leg squat in healthy individuals. Specifically, higher midfoot width mobility, or lower ankle joint dorsiflexion range and midfoot height mobility, were associated with a greater FPPA. These foot mobility factors should be considered in the clinical management of knee-related disorders that are associated with a high FPPA.
Keyword Ankle
Linear models
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: HERDC Pre-Audit
School of Biomedical Sciences Publications
School of Health and Rehabilitation Sciences Publications
Version Filter Type
Citation counts: TR Web of Science Citation Count  Cited 0 times in Thomson Reuters Web of Science Article
Scopus Citation Count Cited 0 times in Scopus Article
Google Scholar Search Google Scholar
Created: Tue, 02 Feb 2016, 00:30:34 EST by System User on behalf of Learning and Research Services (UQ Library)