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Related Concept Videos

Bones of the Upper Limb: Ulna01:15

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...
Bones of the Upper Limb: Radius01:09

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...
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Cardiomyopathy III: Hypertrophic Cardiomyopathy

Hypertrophic cardiomyopathy, or HCM, is an autosomal dominant genetic disorder characterized by asymmetric left ventricular hypertrophy without ventricular dilation. It is more common in men and is typically diagnosed in young, athletic adults.EtiologyHCM is primarily genetic and is caused by mutations in genes encoding sarcomeric proteins. Researchers have identified over 1400 mutations across at least 11 different genes. Among these, the most frequently occurring mutations are found in the...
Huntington Disease l: Introduction01:21

Huntington Disease l: Introduction

Huntington disease or HD is a progressive, fatal neurodegenerative disorder inherited in an autosomal dominant pattern.PathophysiologyIt is caused by expansion of the CAG trinucleotide repeat in the HTT gene on chromosome 4 (4p16.3), producing an abnormal huntingtin protein with an expanded polyglutamine tract. This misfolded protein disrupts cellular function, leading to neuronal death. Normal alleles have ≤26 repeats, 27–35 are intermediate (risk of expansion), 36–39 show reduced penetrance,...

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Related Experiment Video

Updated: Jun 9, 2026

Block Building Task Identifies Distinct Groups of Left/Right-hand Choice Patterns After Unilateral Peripheral Nerve Injury
07:06

Block Building Task Identifies Distinct Groups of Left/Right-hand Choice Patterns After Unilateral Peripheral Nerve Injury

Published on: March 21, 2025

Symptomatic congenital pisiform hamate coalition.

Philip H Zeplin1, Rafael G Jakubietz, Karsten Schmidt

  • 1Department of Trauma, Hand, Plastic and Reconstructive Surgery, University Hospital, Wuerzburg, Germany. zeplin_p@chirurgie.uni-wuerzburg.de

Annals of Plastic Surgery
|August 28, 2010
PubMed
Summary

Congenital carpal bone fusions are rare. This study details a symptomatic congenital pisiform-hamate coalition, successfully treated with surgical intervention including bone grafting and stabilization.

Related Experiment Videos

Last Updated: Jun 9, 2026

Block Building Task Identifies Distinct Groups of Left/Right-hand Choice Patterns After Unilateral Peripheral Nerve Injury
07:06

Block Building Task Identifies Distinct Groups of Left/Right-hand Choice Patterns After Unilateral Peripheral Nerve Injury

Published on: March 21, 2025

Area of Science:

  • Orthopedics
  • Hand Surgery
  • Congenital Anomalies

Background:

  • Congenital carpal bone fusions are rare, affecting less than 1% of the population.
  • These anomalies involve the abnormal fusion of two or more carpal bones.
  • Carpal coalitions can be asymptomatic or present with pain and limited wrist motion.

Observation:

  • A case of symptomatic congenital pisiform-hamate coalition is presented.
  • The coalition became symptomatic following a traumatic event.
  • The patient experienced pain and restricted wrist function due to the anomaly.

Findings:

  • Surgical treatment involved resection of the synchondrosis between the pisiform and hamate.
  • An autogenous bone graft was utilized to reconstruct the joint.
  • Screw stabilization was employed to ensure stability and promote healing.

Implications:

  • This case highlights a successful surgical approach for symptomatic congenital pisiform-hamate coalition.
  • The findings suggest that surgical intervention can effectively manage pain and restore function in such rare carpal anomalies.
  • Early diagnosis and appropriate treatment are crucial for favorable outcomes in congenital carpal fusions.