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Assessment of normal trapeziometacarpal joint alignment
P A Rust1, E T H Ek2, S K Y Tham2,3,4
11 Department of Plastic Surgery, St John's Hospital, Edinburgh, UK.
The Journal of Hand Surgery, European Volume
|February 15, 2017
Summary
Trapeziometacarpal joint alignment changes with age. Increasing age correlates with dorsoradial subluxation, becoming significant after 46 years, with a normal mean of 21%.
Area of Science:
- Orthopedics
- Anatomy
- Radiology
Background:
- The trapeziometacarpal (TMC) joint is crucial for thumb function.
- Age-related changes in joint alignment can impact biomechanics and lead to pain or dysfunction.
Purpose of the Study:
- To assess the normal alignment of the TMC joint.
- To investigate how TMC joint alignment changes with increasing age.
Main Methods:
- Computerized tomographic (CT) scans were utilized.
- Radial, dorsal, and dorsoradial subluxation were measured in 50 adult TMC joints (ages 18-62).
Main Results:
- A statistically significant positive correlation was found between age and dorsoradial subluxation.
- No significant correlation was observed between age and dorsal or radial subluxation.
- Significant dorsoradial subluxation was identified in individuals over 46 years of age.
Conclusions:
- Dorsoradial subluxation of the TMC joint increases with age.
- A mean dorsoradial subluxation of 21% (14%-30%) is considered normal in adults over 46.
- These findings provide normative data for evaluating TMC joint alignment in aging populations.
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