A gap detection tactility test for sensory deficits associated with carpal tunnel syndrome

Ergonomics
O J Jeng, R G Radwin

Abstract

An automated gap detection tactility test was investigated for quantifying sensory deficits associated with carpal tunnel syndrome (CTS). The test, which involved sensing a tiny gap in an otherwise smooth surface by probing with the finger, had functional resemblance to many work-related tactile activities such as detecting scratches or surface defects. Gap detection thresholds were measured using the converging staircase method of limits paradigm. Sixteen normal subjects between 21 and 66 years of age were tested for studying important factors affecting gap detection thresholds. Actively probing with the index finger had a threshold almost an order of magnitude more sensitive (mean = 0.19 mm, SD = 0.11 mm) than passive touch (mean = 1.63 mm, SD = 0.62 mm), which was similar to two-point discrimination. Average thresholds decreased by 24% as contact force increased from 25 to 75 g. Performance in this tactility test quickly stabilized and showed little learning effects over the period of the test, as evidenced by the lack of significant differences between six replicates. The results were highly repeatable. No significant threshold differences were observed between test and retest trials on different days, or between dominant a...Continue Reading

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Citations

Nov 27, 2002·Journal of Hand Therapy : Official Journal of the American Society of Hand Therapists·Nancy BylLaura K Cheney
Nov 24, 2004·The Journal of Orthopaedic and Sports Physical Therapy·Joy C MacDermid, Tim Doherty
Apr 18, 2014·Brain : a Journal of Neurology·Yumi MaedaVitaly Napadow
Jul 23, 2003·American Journal of Industrial Medicine·Mary E SestoFrank J Salvi
Dec 15, 2006·Pain Practice : the Official Journal of World Institute of Pain·Phillip S SizerLeslie Dedrick
Dec 14, 2004·The Journal of Bone and Joint Surgery. American Volume·Robert G RadwinStefan V Zachary

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