Trapeziometacarpal Ligaments Biomechanical Study: Implications in Arthroscopy
Mireia Esplugas1, Alex Lluch-Bergada2, Nathalie Mobargha3
1Clinica Activamutua, Tarragona, Spain.
Journal of Wrist Surgery
|October 26, 2016
Summary
The dorsal ligaments are the primary stabilizers of the trapeziometacarpal joint (TMJ), crucial for preventing thumb instability and dorsoradial subluxation in osteoarthritis. Targeting these ligaments during arthroscopic procedures can enhance joint stability.
Area of Science:
- Orthopedic surgery
- Biomechanics
- Anatomy
Background:
- Trapeziometacarpal joint (TMJ) osteoarthritis can lead to pain and instability.
- Dorsoradial subluxation is a common issue in TMJ instability.
- Arthroscopy is used to assess cartilage damage and ligamentous laxity, and to treat TMJ instability.
Purpose of the Study:
- To biomechanically identify the primary stabilizing ligaments of the trapeziometacarpal joint (TMJ).
- To understand the role of different ligament groups in maintaining TMJ stability.
Main Methods:
- Dissection of 11 fresh-frozen human cadaver specimens.
- Loading of extrinsic and intrinsic muscle tendons acting on the TMJ.
- Sectioning of dorsal, volar, and ulnar ligament groups.
- Motion tracking of the first metacarpal bone (MC1) translation using FasTrak.
Main Results:
- Sectioning volar or ulnar ligaments caused minor MC1 dorsoradial translation (0.150 mm and 0.064 mm, respectively).
- Sectioning dorsal ligaments resulted in significantly greater MC1 dorsoradial translation (0.523 mm, p=0.004).
Conclusions:
- The dorsal ligaments are the primary stabilizers of the trapeziometacarpal joint (TMJ).
- Arthroscopic procedures for TMJ instability should focus on the dorsal ligaments for effective stabilization.
