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Related Concept Videos

Bones of the Upper Limb: Radius01:09

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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...
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Related Experiment Video

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Total Wrist Arthrodesis Using a Wrist Fusion Rod for the Dislocated Rheumatoid Wrist.

Yuta Takasu1,2, Hajime Ishikawa1, Asami Abe1

  • 1Department of Rheumatology, Niigata Rheumatic Center, Shibata, Niigata, Japan.

Journal of Hand Surgery Global Online
|April 30, 2026
PubMed
Summary

This study introduces the Wrist Fusion Rod for total wrist arthrodesis in rheumatoid arthritis patients. The new rod effectively reduces complications, improves wrist function, and provides high patient satisfaction for severe wrist deterioration.

Keywords:
Rheumatoid arthritisTotal wrist arthrodesisWrist dislocationWrist fusion rod

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Area of Science:

  • Orthopedic surgery
  • Rheumatology
  • Biomedical engineering

Background:

  • Rheumatoid arthritis often leads to severe wrist deterioration and dislocation.
  • Traditional wrist arthrodesis techniques carry a risk of complications.
  • A novel intramedullary rod, the Wrist Fusion Rod, was developed to address these challenges.

Purpose of the Study:

  • To evaluate the clinical and radiographic outcomes of total wrist arthrodesis using the novel Wrist Fusion Rod.
  • To assess the safety and efficacy of the Wrist Fusion Rod in patients with severe rheumatoid arthritis-induced wrist deformities.

Main Methods:

  • A retrospective study of 48 wrists in 39 rheumatoid arthritis patients who underwent total wrist arthrodesis with the Wrist Fusion Rod between 2007 and 2021.
  • Preoperative wrists were Larsen grade IV or V with palmar and/or ulnar dislocation.
  • Clinical and radiographic assessments were performed postoperatively.

Main Results:

  • The Wrist Fusion Rod reduced complication rates compared to historical data.
  • Significant improvements were observed in wrist extension (17°), grip strength, pronation, and radiological parameters.
  • Overall patient satisfaction was high, particularly in those with severe ulnar carpal shift.
  • Complications occurred in 17% of wrists, including rod breakage and third metacarpal cortical ballooning.

Conclusions:

  • Total wrist arthrodesis with the Wrist Fusion Rod offers long-lasting pain relief and stability for severe wrist deterioration and ulnar carpal shift.
  • The rod design enhances surgical safety and precision, achieving a stable, desired wrist position.
  • Fixation minimizes micromotion, potentially preventing complications like metacarpal cortical ballooning and eliminating the need for removal.