Amilcar Cardona1, Matthew S Thiese, Jay Kapellusch, Andrew Merryweather, Eric Wood, Kurt T Hegmann. 1. Rocky Mountain Center for Occupational and Environmental Health University of Utah (Dr Cardona, Dr Thiese, Dr Wood, and Dr Hegmann); College of Health Sciences University of Wisconsin-Milwaukee, Milwaukee, Wisconsin (Dr Kapellusch); Department of Mechanical Engineering University of Utah (Dr Merryweather), Salt Lake City, Utah.
Abstract
OBJECTIVES: Identify if Carpal tunnel syndrome (CTS) symptoms vary by measured biomechanical exposures. METHODS: A nested prospective cohort within a large, multicenter, 8-year cohort study. The CTS case definition was tingling/numbness in 2+ median nerve-served digits plus a nerve conduction study consistent with CTS. Workers were assigned to: (1) low (strain index [SI] less than or equal to 6.1), and (2) high (SI more than 6.1) job groups. RESULTS: Among 1201 workers, 106 had CTS. Those in the high SI group became and remained symptom-free for at least 3 months, faster than the low SI group, adjusted hazard ratio (HR) = 2.07 (95% confidence interval [CI] = 1.21 to 3.56, P = 0.008). Only surgical release trended towards resolving CTS. Light duty had no impact, and job change was associated with delayed symptoms resolution. CONCLUSIONS: High biomechanical exposures paradoxically predicted faster improvement in CTS and light duty did not result in symptom resolution.
OBJECTIVES: Identify if Carpal tunnel syndrome (CTS) symptoms vary by measured biomechanical exposures. METHODS: A nested prospective cohort within a large, multicenter, 8-year cohort study. The CTS case definition was tingling/numbness in 2+ median nerve-served digits plus a nerve conduction study consistent with CTS. Workers were assigned to: (1) low (strain index [SI] less than or equal to 6.1), and (2) high (SI more than 6.1) job groups. RESULTS: Among 1201 workers, 106 had CTS. Those in the high SI group became and remained symptom-free for at least 3 months, faster than the low SI group, adjusted hazard ratio (HR) = 2.07 (95% confidence interval [CI] = 1.21 to 3.56, P = 0.008). Only surgical release trended towards resolving CTS. Light duty had no impact, and job change was associated with delayed symptoms resolution. CONCLUSIONS: High biomechanical exposures paradoxically predicted faster improvement in CTS and light duty did not result in symptom resolution.
Authors: Robert A Werner; Alfred Franzblau; Nancy Gell; Anne G Hartigan; Marissa Ebersole; Thomas J Armstrong Journal: J Occup Environ Med Date: 2005-10 Impact factor: 2.162
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