Elbow

Elbow Anatomy

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 from 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 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: These are 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.

Conditions

Bicep Tendon Tear at Elbow

Bicep Tendon Tear at Elbow

The biceps muscle, located in the front of the upper arm allows you to bend the elbow and rotate the arm. Biceps tendons attach the biceps muscle to the bones in the shoulder and in the elbow.

Biceps tear can be complete or partial. Partial biceps tendon tears will not completely break the tendon.

Elbow Sprain

Elbow Sprain

Elbow sprain is an injury to the soft tissues of the elbow. It is caused due to stretching or tearing (partial or full) of the ligaments which support the elbow joint. Ligaments are a group of fibrous tissues that connect one bone to another in the body.

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). It is a painful condition occurring from repeated muscle contractions at the forearm that leads to inflammation and micro tears in the tendons that attach to the lateral epicondyle.

Golfer’s Elbow

Golfer’s Elbow

Golfer’s elbow, also called medial epicondylitis, is a painful condition occurring from repeated muscle contractions in the forearm that leads to inflammation and microtears in the tendons that attach to the medial epicondyle. The medial epicondyle is the bony prominence that is felt on the inside of the elbow.

Ulnar Nerve Entrapment (Cubital Tunnel Syndrome)

Ulnar Nerve Entrapment (Cubital Tunnel Syndrome)

Cubital Tunnel Syndrome is a condition characterized by compression of the ulnar nerve in an area of the elbow called the cubital tunnel.

The ulnar nerve travels down the back of the elbow behind the bony bump called the medial epicondyle, and through a passageway called the cubital tunnel.

Elbow Contracture

Elbow Contracture

Elbow contracture refers to a stiff elbow with limited range of motion. It is a common complication following elbow surgery, fractures, dislocations, and burns.

The normal functional range of motion for an elbow is 30-145 degrees. A stiff or contracted elbow may be diagnosed when the ability to extend or flex the arm is lessened by 30 degrees or more.

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; some of them being a fall on an outstretched arm, a direct blow to the elbow, or an abnormal twist to the joint beyond its functional limit.

Procedures

Total Elbow Replacement

Total Elbow Replacement

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

The arm in the human body is made up of three bones that join to form a hinge joint called the elbow.

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.

The Elbow is a complex hinge joint formed by the articulation of three bones - humerus, radius and ulna.

Elbow Ligament Reconstruction

Elbow Ligament Reconstruction

The elbow is a complex joint of the upper limb formed by the articulation of the long bone of the upper arm or humerus and the two bones of the forearm, namely, radius and ulna. It is one of the important joints of the upper limb and is involved in basic movements such as flexion and extension of the upper limb and rotation of the forearm.

Elbow Tendon and Ligament Repair

Elbow Tendon and Ligament Repair

The elbow is a complex joint of the upper limb formed by the articulation of the long bone of the upper arm or humerus and the two bones of the forearm, namely, radius and ulna. It is one of the important joints of the upper limb and is involved in basic movements such as flexion and extension of the upper limb and rotation of the forearm.

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  • Marquette University College Of Health Sciences
  • New England Baptist Hospital
  • School of Medicine And Public Health
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