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The scaphotrapezio-trapezoidal joint. Part 2: A kinematic study.

H Moritomo¹, S F Viegas, K Elder

¹Division of Hand Surgery, Department of Orthopaedic Surgery and Rehabilitation, The University of Texas Medical Center, Galveston, TX 77555-1350, USA.

The Journal of Hand Surgery

|October 21, 2000

Summary

The scaphotrapezio-trapezoidal joint exhibits a single rotational motion during wrist flexion/extension and radial/ulnar deviation. This key wrist joint movement is consistent across different hand motions.

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Area of Science:

Biomechanics
Orthopedics
Anatomy

Background:

The wrist joint's complex kinematics are crucial for hand function.
Understanding the motion of the scaphotrapezio-trapezoidal joint is essential for diagnosing and treating wrist conditions.

Purpose of the Study:

To investigate the 3D kinematics of the scaphotrapezio-trapezoidal joint during wrist flexion/extension motion (FEM) and radial/ulnar deviation (RUD).

Main Methods:

Utilized a 3-dimensional dynamic motion analysis system.
Analyzed the rotational motion and axis of rotation of the scaphoid/trapezoid bones.

Main Results:

Scaphoid/trapezoid motion is rotational, oriented obliquely to the wrist's sagittal plane, and occurs in an ulnoflexion/radial extension plane during FEM and RUD.
The axis of rotation is consistent, running from the distal scaphoid to the capitate waist.
The trapezium-trapezoid and trapezoid-capitate joints showed minimal mobility.

Conclusions:

The scaphotrapezio-trapezoidal joint functions as a single degree of freedom.
This motion pattern is consistent during both wrist flexion/extension and radial/ulnar deviation.