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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.
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The muscles that move the forearms can be divided into four groups: forearm flexors, forearm extensors, forearm pronators, and forearm supinators. The flexors and extensors act on the elbow joint, while the pronators and supinators act on the radioulnar joints.
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Updated: Oct 18, 2025

Metacarpal Small Incision for Carpal Tunnel Syndrome
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Extensor Carpi Ulnaris Subluxation.

Jacqueline N Byrd1, Sarah E Sasor2, Kevin C Chung3

  • 1Section of Plastic Surgery, Department of Surgery, University of Michigan Medical School, North Campus Research Complex, 2800 Plymouth Road, Building 16, Room 122W, Ann Arbor, MI 48109, USA; Department of Surgery, University of Texas Southwestern Medical School, Dallas, TX, USA.

Hand Clinics
|October 4, 2021
PubMed
Summary
This summary is machine-generated.

Extensor carpi ulnaris tendon subluxation causes wrist pain due to subsheath tears. Diagnosis involves examination and ultrasound, with surgical repair recommended for stabilization.

Keywords:
Hand surgeryPatient outcomesSports injuriesWrist pain

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Area of Science:

  • Orthopedics
  • Sports Medicine
  • Hand Surgery

Background:

  • Extensor carpi ulnaris (ECU) tendon subluxation is a significant cause of wrist pain.
  • The ECU tendon is stabilized by a subsheath, which is susceptible to tears during specific wrist movements.

Purpose of the Study:

  • To discuss the diagnosis and management of extensor carpi ulnaris tendon subluxation.
  • To highlight the role of ultrasonography in evaluating dynamic tendon instability.

Main Methods:

  • Clinical examination for tenderness, swelling, and instability.
  • Ultrasonography to assess ECU tendon subluxation and dynamic instability.
  • Review of surgical techniques for subsheath reconstruction.

Main Results:

  • Acute presentations involve pain, swelling, and tenderness.
  • Chronic cases often manifest as wrist instability.
  • Ultrasonography is effective in visualizing dynamic subluxation.

Conclusions:

  • Extensor carpi ulnaris tendon subluxation requires careful diagnosis.
  • Surgical repair using an extensor retinaculum flap is an effective treatment.
  • Prompt diagnosis and intervention can restore wrist stability.