Volume 56, Issue 6 pp. 1047-1053
Clinical Research

Association between wrist ratio and carpal tunnel syndrome: Effect modification by body mass index

Matthew S. Thiese PhD, MSPH

Corresponding Author

Matthew S. Thiese PhD, MSPH

Rocky Mountain Center for Occupational and Environmental Health, University of Utah, 391 Chipeta Way, Suite C, Salt Lake City, Utah, 84108 USA

Correspondence to: M. S. Thiese; e-mail: [email protected].Search for more papers by this author
Andrew Merryweather PhD

Andrew Merryweather PhD

Department of Mechanical Engineering, University of Utah, Salt Lake City, Utah, USA

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Alzina Koric MPP

Alzina Koric MPP

Rocky Mountain Center for Occupational and Environmental Health, University of Utah, 391 Chipeta Way, Suite C, Salt Lake City, Utah, 84108 USA

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Ulrike Ott PhD, MSPH

Ulrike Ott PhD, MSPH

Rocky Mountain Center for Occupational and Environmental Health, University of Utah, 391 Chipeta Way, Suite C, Salt Lake City, Utah, 84108 USA

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Eric M. Wood MD, MPH

Eric M. Wood MD, MPH

Rocky Mountain Center for Occupational and Environmental Health, University of Utah, 391 Chipeta Way, Suite C, Salt Lake City, Utah, 84108 USA

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Jay Kapellusch PhD

Jay Kapellusch PhD

Center for Ergonomics, University of Wisconsin-Milwaukee, Milwaukee, Wisconsin, USA

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James Foster MD

James Foster MD

Center for Ergonomics, University of Wisconsin-Milwaukee, Milwaukee, Wisconsin, USA

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Arun Garg PhD

Arun Garg PhD

Center for Ergonomics, University of Wisconsin-Milwaukee, Milwaukee, Wisconsin, USA

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Gwen Deckow-Schaefer MS, OTR/L

Gwen Deckow-Schaefer MS, OTR/L

Encore Unlimited LLC, Stevens Point, Wisconsin, USA

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Suzanna Tomich MS, OTR

Suzanna Tomich MS, OTR

Argent, Waukesha, Wisconsin, USA

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Richard Kendall DO

Richard Kendall DO

Department of Physical Medicine and Rehabilitation, University of Utah, Salt Lake City, Utah, USA

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David L. Drury MD, MPH

David L. Drury MD, MPH

Allina Health Clinics, Minneapolis, Minnesota, USA

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Jacqueline Wertsch MD

Jacqueline Wertsch MD

Department of Physical Medicine and Rehabilitation, Medical College of Wisconsin, Milwaukee, Wisconsin, USA

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Kurt T. Hegmann MD, MPH

Kurt T. Hegmann MD, MPH

Rocky Mountain Center for Occupational and Environmental Health, University of Utah, 391 Chipeta Way, Suite C, Salt Lake City, Utah, 84108 USA

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The Wistah Study Team
First published: 13 May 2017
Citations: 12

Funding: This work was funded in part by grants from the National Institute for Occupational Safety and Health (U 01 OH007917-01; 3TC42OH008414).

Conflicts of Interest: None of the authors have any conflicts of interest to disclose.

ABSTRACT

Introduction

Previous studies have reported higher wrist ratios (WR) related to carpal tunnel syndrome (CTS) but have not assessed effect modification by obesity and may have inadequately controlled for confounders.

Methods

Baseline data of a multicenter prospective cohort study were analyzed. CTS was defined by nerve conduction study (NCS) criteria and symptoms.

Results

Among the 1,206 participants, a square-shaped wrist was associated with CTS after controlling for confounders (prevalence ratio = 2.27; 95% confidence interval [95% CI], 1.33–3.86). Body mass index (BMI) was a strong effect modifier on the relationship between WR and both CTS and abnormal NCS results, with normal weight strata of rectangular versus square wrists = 8.18 (95% CI, 1.63–49.96) and 7.12 (95% CI, 2.19–23.16), respectively.

Discussion

A square wrist is significantly associated with CTS after controlling for confounders. Effect modification by high BMI masked the eightfold magnitude adjusted relationship seen between WR and CTS among normal weight participants. Muscle Nerve 56: 1047–1053, 2017

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