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Elbow

The elbow is a complex joint formed by the articulation of three bones –the humerus, radius and ulna. The elbow joint helps in bending or straightening of the arm to 180 degrees and assists in lifting or moving objects.

The bones of the elbow are supported by:

  • Ligaments and tendons
  • Muscles
  • Nerves
  • Blood vessels

Bones and Joints of the Elbow Joint

The elbow joint is formed at the junction of three bones:

  • The Humerus (upper arm bone) forms the upper portion of the joint. The lower end of the humerus divides in to two bony protrusions known as the medial and lateral epicondyles which can be felt on either side of the elbow joint.
  • The Ulna is the larger bone of the forearm located on the inner surface of the joint. The curved shape of the ulna articulates with the humerus.
  • The Radius is the smaller bone of the forearm situated on the outer surface of the joint. The head of the radius is circular and hollow which allows movement with the humerus. The connection between the ulna and radius helps the forearm to rotate.

The elbow consists of three joints because of articulation of the three bones namely:

  • Humero-ulnar joint is formed between the humerus and ulna and allows flexion and extension of the arm.
  • Humero-radial joint is formed between the radius and humerus, and allows movements like flexion, extension, supination and pronation.
  • Radio-ulnar joint is formed between the ulna and radius bones, and allows rotation of the lower arm.

Articular cartilage lines the articulating regions of the humerus, radius and ulna. It is a thin, tough, flexible, and slippery surface that acts as a shock absorber and cushion to reduce friction between the bones. The cartilage is lubricated by synovial fluid, which further enables the smooth movement of the bones.

Muscles of the Elbow Joint

There are several muscles extending across the elbow joint that help in various movements. These include the following:

  • Biceps brachii: upper arm muscle enabling flexion of the arm
  • Triceps brachii: muscle in the back of the upper arm that extends the arm and fixes the elbow during fine movements
  • Brachialis: upper arm muscle beneath the biceps which flexes the elbow towards the body
  • Brachioradialis: forearm muscle that flexes, straightens and pulls the arm at the elbow
  • Pronator teres: this muscle extends from the humeral head, across the elbow, and towards the ulna, and helps to turn the palm facing backward
  • Extensor carpi radialis brevis: forearm muscle that helps in movement of the hand
  • Extensor digitorum: forearm muscle that helps in movement of the fingers

Elbow Joint Ligaments and Tendons

The elbow joint is supported by ligaments and tendons, which provide stability to the joint.

Ligaments are a group of firm tissues that connect bones to other bones. The most important ligaments of the elbow joint are the:

  • Medial or ulnar collateral ligament: comprised of triangular bands of tissue on the inner side of the elbow joint.
  • Lateral or radial collateral ligament: a thin band of tissue on the outer side of the elbow joint.

Together, the medial and lateral ligaments are the main source of stability and hold the humerus and ulna tightly in place during movement of the arm.

  • Annular ligament: It is a group of fibers that surrounds the radial head, and holds the ulna and radius tightly in place during movement of the arm.

The ligaments around a joint combine to form a joint capsule that contains synovial fluid.

Any injury to these ligaments can lead to instability of the elbow joint.

Tendons are bands of connective tissue fibers that connect muscle to bone. The various tendons which surround the elbow joint include:

  • Biceps tendon: attaches the biceps muscle to the radius, allowing the elbow to bend
  • Triceps tendon: attaches the triceps muscle to the ulna, allowing the elbow to straighten

Nerves of the Elbow Joint

The main nerves of the elbow joint are the ulnar, radial and median nerves. These nerves transfer signals from the brain to the muscles that aid in elbow movements. They also carry the sensory signals like touch, pain, and temperature back to the brain.

Any injury or damage to these nerves causes pain, weakness or joint instability.

Blood vessels

Arteries are blood vessels that carry oxygen-pure blood from the heart to the hand. The main artery of the elbow is the brachial artery that travels across the inside of the elbow and divides into two small branches below the elbow to form the ulnar and the radial artery.

Elbow Arthritis

Elbow Arthritis

Although the elbows are not weight-bearing joints, they are considered to be most important for the functioning of the upper limbs. Hence, even minor trauma or disease affecting the elbow may cause pain and limit the movements of the upper limbs.

Elbow Fractures

Elbow Fractures

Three bones, the humerus, radius and ulna, make up the elbow joint. Elbow fractures may occur from trauma, resulting from various reasons; a fall on an outstretched arm, a direct blow to the elbow, or an abnormal twist to the joint beyond its functional limit.

Elbow Dislocation

Elbow Dislocation

The elbow is a hinge joint made up of 3 bones – humerus, radius and ulna. The bones are held together by ligaments to provide stability to the joint. Muscles and tendons move the bones around each other and help in performing various activities.

Tennis Elbow

Tennis Elbow

Tennis elbow is the common name used for the elbow condition called lateral epicondylitis. It is an overuse injury that causes inflammation of the tendons that attach to the bony prominence on the outside of the elbow (lateral epicondyle).

Total Elbow Arthroplasty

Total Elbow Arthroplasty

Elbow Joint Arthroplasty, also referred to as Total Elbow Replacement, is an operative procedure to treat the symptoms of arthritis that have not responded to non-surgical treatments.

Distal Biceps Tendon Repair

Distal Biceps Tendon Repair

The biceps muscle is located in front of your upper arm. It helps in bending your elbow as well as in rotational movements of your forearm. Also, it helps to maintain stability in the shoulder joint.

Cubital Tunnel Release

Cubital Tunnel Release

Your physician will recommend conservative treatment options initially to treat the symptoms unless muscle wasting or nerve damage is present.

Elbow Arthroscopy

Elbow Arthroscopy

Elbow arthroscopy, also referred to as keyhole or minimally invasive surgery, is performed through tiny incisions to evaluate and treat several elbow conditions.

Distal Triceps Repair

Distal Triceps Repair

Triceps repair is a surgical procedure that involves the repair of a ruptured (torn) triceps tendon. A tendon is a tough band of fibrous tissue which connects muscle to bone, and works together with muscles in moving your arms, fingers, legs, and toes.

Elbow Ligament Reconstruction

Elbow Ligament Reconstruction

Ligament reconstruction is considered in patients with ligament rupture. Your surgeon will make an incision over the elbow. Care is taken to move muscles, tendons and nerves out of the way.