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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...

Bones of the Upper Limb: Humerus

Bones of the Upper Limb: Humerus

The upper limb consists of the arm, forearm, wrist, and hand bones. The humerus is the single bone of the upper arm region. Proximally, it has a large, spherical, smooth head that articulates with the glenoid cavity of the scapula to form the glenohumeral or shoulder joint. The margin of the head is the anatomical neck, a residual epiphyseal plate. Laterally it extends to form bony projections called the greater tubercle and the lesser tubercle. Next to the tubercles is the surgical neck, a...

Spinal Nerves: Plexus I

Spinal Nerves: Plexus I

Nerve plexuses are networks of interlacing nerves that serve as communication hubs to distribute and organize nerve action across various body regions. The nerve plexuses are organized into the cervical plexus located in the neck region, brachial plexus in the shoulder area, lumbar plexus found in the lower back, sacral plexus situated in the pelvis, and coccygeal plexus located in the coccygeal region.
The Cervical Plexus
The cervical plexus, formed by the anterior rami of the first four...

Arteries of the Upper Limbs

Arteries of the Upper Limbs

The subclavian artery transitions into the axillary artery as it exits the chest and enters the axillary region. This artery is critical for supplying blood to the shoulder area, including the head of the humerus, through the humeral circumflex arteries. As the vessel continues into the upper arm or brachium, it becomes the brachial artery. This artery plays a key role in vascularizing the brachial region and bifurcates at the elbow into several branches. These branches include the deep...

Muscles that Move the Forearm

Muscles that Move the Forearm

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.
Forearm Flexors
The biceps brachii, brachialis, and brachioradialis are forearm flexors. The biceps brachii is made up of two heads. Its long head originates at the supraglenoid tubercle of the scapula, whereas that of the short head is...

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Related Experiment Video

Updated: Jun 13, 2026

Development of a Novel Internal Fixation Model for Rat Radial Fractures: Fracture Healing Assessment and Dorsal Root Ganglion Isolation

Development of a Novel Internal Fixation Model for Rat Radial Fractures: Fracture Healing Assessment and Dorsal Root Ganglion Isolation

Published on: March 13, 2026

Snapping elbow with congenital radial head dislocation: case report.

Masahiro Maruyama¹, Masatoshi Takahara, Noriaki Kikuchi

¹Department of Orthopaedic Surgery, Yamagata University School of Medicine, Yamagata City, Japan.

The Journal of Hand Surgery

|May 12, 2010

Summary

Congenital radial head dislocation in an 11-year-old boy caused painful elbow snapping. Releasing the annular ligament during arthroscopy resolved the snapping, with no recurrence five years later.

Related Experiment Videos

Last Updated: Jun 13, 2026

Development of a Novel Internal Fixation Model for Rat Radial Fractures: Fracture Healing Assessment and Dorsal Root Ganglion Isolation

Development of a Novel Internal Fixation Model for Rat Radial Fractures: Fracture Healing Assessment and Dorsal Root Ganglion Isolation

Published on: March 13, 2026

Area of Science:

Orthopedic surgery
Pediatric orthopedics
Elbow biomechanics

Background:

Congenital radial head dislocation is a rare condition.
Elbow pain and snapping can significantly impact a child's quality of life.
Understanding the mechanism of snapping is crucial for effective treatment.

Observation:

An 11-year-old boy presented with painful left elbow snapping without prior trauma.
Radiographs revealed anterior radial head dislocation and hypoplastic radial neck.
Arthroscopy identified snapping between the annular ligament and dislocated radial head during motion.

Findings:

The snapping sensation was directly correlated with the interaction between the annular ligament and the dislocated radial head.
Surgical release of the annular ligament provided immediate resolution of the snapping.
The patient remained symptom-free five years post-surgery, indicating a successful outcome.

Implications:

Annular ligament release is an effective treatment for symptomatic congenital radial head dislocation with snapping.
This intervention can restore normal elbow function and alleviate pain in pediatric patients.
Further research into the long-term effects and optimal surgical timing is warranted.