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Axial Rotation Test for Trapeziometacarpal Joint Hypermobility in the Normal Population.

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  • 1* Hand Surgery Division, INTEGRIS Baptist Medical Center, Oklahoma City, OK, USA.

The Journal of Hand Surgery Asian-Pacific Volume
|October 5, 2018
PubMed
Summary

Young women exhibit greater trapeziometacarpal (TM) joint laxity than men and older women. The axial rotation test effectively quantifies this rotational laxity in the TM joint.

Keywords:
ArthritisCMCInstabilityThumbTrapeziometacarpal

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Area of Science:

  • Orthopedics
  • Biomechanics
  • Anatomy

Background:

  • Joint laxity assessment is crucial for understanding musculoskeletal health.
  • The trapeziometacarpal (TM) joint is susceptible to instability and injury.
  • Quantifying passive axial rotation provides objective joint laxity measures.

Purpose of the Study:

  • To quantify joint laxity in healthy volunteers.
  • To measure passive axial rotation of the trapeziometacarpal (TM) joint.
  • To evaluate the efficacy of the axial rotation test for TM joint laxity.

Main Methods:

  • Eighty healthy volunteers (34 men, 46 women) participated.
  • The axial rotation shear test was employed to assess total rotational motion (TRM).
  • Volunteers were stratified into two age groups (18-50 and 51+ years).

Main Results:

  • Young women (Group I) showed significantly greater average TRM (32.3 mm) than young men (27.4 mm, p=0.04).
  • Both young women (32.3 mm) and older women (21.6 mm, p<0.001) exhibited higher TRM compared to their male counterparts.
  • In older adults (Group II), no significant TRM difference was found between men (19.4 mm) and women (21.6 mm).

Conclusions:

  • Young women possess greater rotational laxity in the TM joint compared to same-aged men and older women.
  • The axial rotation test is a reliable method for quantifying TM joint rotational laxity.
  • Age and sex are significant factors influencing TM joint laxity.