Humeroradial joint

Humeroradial joint is a type of synovial joint that connects the humerus and the radius, two of the main bones in the human arm. It is one of the two joints that make up the elbow, the other being the humeroulnar joint.

Etymology

The term "humeroradial" is derived from the Latin words "humerus" (shoulder) and "radius" (spoke of a wheel), referring to the bones that form the joint.

Anatomy

The humeroradial joint is formed where the capitulum of the humerus meets the head of the radius. The joint is enclosed by a thin, loose articular capsule, which is lined by synovial membrane. The capsule is strengthened by lateral and medial collateral ligaments.

Function

The humeroradial joint allows for two types of movement: flexion and extension, and pronation and supination. Flexion and extension occur in the sagittal plane around a transverse axis, allowing the arm to bend and straighten. Pronation and supination occur in the horizontal plane around a vertical axis, allowing the hand and the upper arm to rotate.

Clinical significance

Injuries to the humeroradial joint, such as fractures or dislocations, can cause pain, swelling, and loss of function. Treatment may involve immobilization, physical therapy, or surgery.

Related terms

• Elbow
• Humerus
• Radius
• Synovial joint
• Articular capsule
• Synovial membrane
• Collateral ligaments
• Flexion and extension
• Pronation and supination
• Fracture
• Dislocation

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  Normal radiocapitellar line

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  Abnormal radiocapitellar line