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Foot Ankle Int. 2014 Nov;35(11):1159-65. doi: 10.1177/1071100714543907. Epub 2014 Jul 18.

Foot disorders associated with overpronated and oversupinated foot function: the Johnston County osteoarthritis project.

Author information

1
Department of Epidemiology, University of North Carolina, Chapel Hill, NC, USA Thurston Arthritis Research Center, University of North Carolina, Chapel Hill, NC, USA Injury Prevention Research Center, University of North Carolina, Chapel Hill, North Carolina, USA golight@email.unc.edu.
2
Institute for Aging Research, Hebrew SeniorLife, Boston, MA, USA Beth Israel Deaconess Medical Center, Boston, MA, USA Harvard Medical School, Boston, MA, USA.
3
Hospital for Special Surgery, New York, NY, USA.
4
Department of Epidemiology, University of North Carolina, Chapel Hill, NC, USA Thurston Arthritis Research Center, University of North Carolina, Chapel Hill, NC, USA Department of Medicine, University of North Carolina, Chapel Hill, NC, USA Department of Orthopedics, University of North Carolina, Chapel Hill, NC, USA.

Abstract

BACKGROUND:

The occurrence of musculoskeletal foot disorders differs by race and obesity, and these disorders may be related to pronated (low arch) or supinated (high arch) foot structure. This cross-sectional analysis examined relationships of foot disorders and foot function by race and obesity in a community-based observational study of adults 50+ years old with and without osteoarthritis.

METHODS:

Members of a prospective cohort study in North Carolina were included in this analysis (N = 1466, 67.2% women, 29.5% African American, mean age 68.5 years). Foot disorders were identified with a validated assessment tool, and each foot was categorized as overpronated, oversupinated, and referent using the center of pressure excursion index from foot pressure scans during normal-paced walking. Logistic regression models estimated associations between foot function and each foot disorder with age, body mass index (BMI), gender, and race as covariates.

RESULTS:

Compared to referent, an overpronated foot was associated with hallux valgus (adjusted odds ratio [aOR] 1.36, 95% confidence interval [CI] 1.13-1.65) and overlapping toes (aOR 1.36, 95% CI 1.12-1.64), especially in the obese. An oversupinated foot was inversely associated with hallux valgus (aOR 0.85, 95% CI 0.74-0.97). An oversupinated foot was less likely to be associated with bunionettes among the obese and was more likely to be associated with plantar fasciitis in Caucasians.

CONCLUSION:

Foot function was related to hallux valgus and overlapping toes, especially among the obese. In clinical patients as well as in the community of older adults, treatments for both the foot disorder and the pronated/supinated foot may be needed.

LEVEL OF EVIDENCE:

Level II, comparative cohort study.

KEYWORDS:

biomechanics; epidemiology; foot disorders; pronation; supination

PMID:
25037712
PMCID:
PMC4392721
DOI:
10.1177/1071100714543907
[Indexed for MEDLINE]
Free PMC Article

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