Lateral supracondylar ridges

Lateral Supracondylar Ridges

The lateral supracondylar ridges are anatomical features found on the distal end of the humerus bone. They are located on the lateral aspect of the bone, just above the condyle. These ridges serve as attachment sites for various muscles and ligaments, contributing to the stability and movement of the elbow joint.

Anatomy

The lateral supracondylar ridges are bony prominences that can be palpated on the lateral side of the distal humerus. They are located proximal to the lateral epicondyle, which is another important landmark of the humerus bone. The ridges extend horizontally and are slightly curved, forming a prominent bony ridge.

Function

The main function of the lateral supracondylar ridges is to provide attachment points for muscles and ligaments involved in the movement of the elbow joint. Some of the important structures that attach to these ridges include:

• Brachioradialis muscle: This muscle originates from the lateral supracondylar ridge and inserts into the styloid process of the radius. It plays a role in flexing the forearm at the elbow joint.

• Extensor carpi radialis longus muscle: This muscle also originates from the lateral supracondylar ridge and inserts into the base of the second metacarpal bone. It is involved in extending and abducting the wrist joint.

• Lateral collateral ligament: This ligament attaches to the lateral supracondylar ridge and provides stability to the lateral aspect of the elbow joint.

Clinical Significance

The presence of well-developed lateral supracondylar ridges can have clinical implications. In some cases, these ridges may become enlarged or prominent, leading to conditions such as:

• Supracondylar process syndrome: This condition occurs when the lateral supracondylar ridge forms a bony bridge across the brachial artery, potentially compressing it. This can result in symptoms such as pain, numbness, and weakness in the forearm and hand.

• Cubital tunnel syndrome: In rare cases, an enlarged lateral supracondylar ridge can contribute to the compression of the ulnar nerve as it passes through the cubital tunnel. This can cause symptoms such as tingling, numbness, and weakness in the ring and little fingers.