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Bones of the Upper Limb: Radius

Bones of the Upper Limb: Radius

The radius is longer of the two bones that make up the human antebrachium or forearm. At the proximal end, the radius articulates with the capitulum of the humerus and the radial notch of the ulna to form the elbow joint. At the distal end, the radius articulates with the ulna via the ulnar notch, forming the distal radioulnar joint. Distally, the radius also attaches to the carpal wrist bones (scaphoid and lunate) to form the radiocarpal joint.
The radius has a nail-shaped head, and a short...

Bones of the Upper Limb: Ulna

Bones of the Upper Limb: Ulna

The ulna and radius are parallel bones of the antebrachium or the forearm. The ulna lies medially and consists of a bony tip called the olecranon process at its proximal end. This hook-like projection articulates with the olecranon fossa of the humerus and forms the "hinged" ulnohumeral part of the elbow joint. This joint facilitates forearm extension and flexion while preventing its hyperextension. Similarly, the coronoid process, another bony projection on the proximal/anterior side of the...

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Radiolunate fusion with distraction using corticocancellous bone graft for minimizing decrease of wrist motion in

Tatsuya Masuko¹, Norimasa Iwasaki, Jun-Ichi Ishikawa

¹Department of Orthopaedic Surgery, Hokkaido University Graduate School of Medicine, Sapporo, Japan. masuko@med.hokudai.ac.jp

Hand Surgery : an International Journal Devoted to Hand and Upper Limb Surgery and Related Research : Journal of the Asia-Pacific Federation of Societies for Surgery of the Hand

|July 15, 2009

Summary

This study modified radiolunate fusion for rheumatoid arthritis, minimizing wrist motion loss. The new technique preserves range of motion better than traditional methods.

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Area of Science:

Orthopedic Surgery
Rheumatology
Hand Surgery

Background:

Rheumatoid arthritis often necessitates surgical intervention for wrist joint destruction.
Traditional radiolunate fusion can lead to significant loss of wrist range of motion, particularly flexion.
Previous research suggested joint distraction could mitigate motion loss.

Purpose of the Study:

To evaluate a modified radiolunate fusion technique designed to minimize post-operative range of motion decrease.
To test the hypothesis that a corticocancellous bone graft with slight over-correction provides radioscaphoid joint distraction.
To protect against decreased range of motion following arthrodesis.

Main Methods:

A modified radiolunate fusion procedure was performed on twelve wrists in ten patients with rheumatoid arthritis.
A corticocancellous bone graft was inserted between the radius and lunate with slight over-correction.
Patients were followed for a mean of 5.7 years, with clinical and radiological assessments.

Main Results:

The modified procedure successfully minimized the decrease in wrist range of motion compared to existing methods.
Clinical and radiological evaluations supported the effectiveness of the technique in preserving joint mobility.
No significant complications related to the graft or over-correction were detailed.

Conclusions:

The modified radiolunate fusion technique is effective in preserving wrist range of motion.
This approach offers a valuable alternative for rheumatoid arthritis patients undergoing wrist arthrodesis.
The method is recommended for its ability to minimize post-operative motion deficits.