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Submitted: 27 May 2016 Modified: 22 August 2019
HERDIN Record #: NCR-UERMMMC-16052711360014

A correlational study between smartphone size and range of motion of the thumb.

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Introduction A thumb working in extreme range of motion during manipulation of a smartphone may contribute to the development of musculoskeletal disorders. This research was conducted to determine the relationship of the range of motion of the thumb with the size, activities done, and manner of manipulation of the smartphone.

Methods The passive range of motion of the carpometacarpal, metacarpophalangeal and interphalangeal joints of the thumb were measured with a goniometer and correlated with the dimensions of the phone, type of activities done on the phone and type of manipulation using the Spearman rho statistics.

Reults There was moderate correlation between extension of the metacarpophalangeal and interphalangeal joints of the thumbs and the width of the phone. Web browsing, texting and calling showed a weak negative correlation with specific movements of some joints. Manipulation of the phone using both thumbs showed a negative weak correlation with flexion of the right interphalangeal joint and left metacarpophalangeal and interphalangeal joints.

Conclusion There was weak correlation between size of the phone, type of activity and type of manipulation and the range of motion of the thumb and its joints.

Publication Type
Publication Sub Type
Journal Article, Original
The Health Sciences Journal
Publication Date
July-December 2015
LocationLocation CodeAvailable FormatAvailability
UERMMMC Fulltext Print Format
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