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elbowpainElbow Pain

The elbow is a strong stable joint, but because of its frequent use most injuries are often repetitive stress disorders like tendonitis or bursitis. Elbows are most often injured by falling resulting in bruises, bursa irritation or fractures.

 

 

 

Bones of the ElbowThe elbow is a stable joint that moves in two directions; it bends and extends (it is affected with forearm rotation). The joint itself is made up of 2 bones, but discussing the elbow 3 bones are commonly mentioned.

Humerus
The upper arm bone

Ulna
This is the bone on the pinky side of the arm. It cups the humerus creating the elbow joint.

Radius
This is the bone on the thumb side of the bone. The upper end, by the elbow, is rounded which allows the forearm to rotate.

Ligaments of the ElbowUlnar Collateral Ligament

This ligament holds the ulna to the humerus. There are 3 separate bands that form this ligament.

Radial Collateral Ligament
This ligament holds the radius to the ulna.

Annular Ligament
This ligament holds the head of the radius in place.

Diagram of Muscles Flexing When the Arm is BentThere are several muscles that have attachments to the elbow. We will look at the major muscles and the muscles that form groups.

Bicep
The biceps is located on the front side of the arm and attaches from the shoulder and upper arm bone to the forearm (below the elbow) and when contracted bends the arm.

Tricep
The triceps are located on the back of the arm and attached from the shoulder and upper arm bone and attaches to the elbow and when contracted straightens the arm.

Muscle Flexors of the ForearmForearm Flexors
These are a group of individual muscles on the inside of the forearm and come together attaching to the inside of the elbow. These muscles are used for gripping and curling the wrist. Tendonitis sometimes develops here; golfers and throwing athletes are more prone to developing tendonitis due to the mechanics of their sports.

Forearm Extensors
These are a group of individuals muscles on the outside of the forearm and come together attaching to the outside of the elbow. These muscles are used for opening the hand (extending the fingers) and extending the wrist. This is the most common site for developing tendonitis (tennis elbow).

Nerves of the ElbowThere are 5 major nerves that run down the shoulder to the hand. We will mention 3 of the 5 for they are most common in elbow/forearm and hand injuries.

Median Nerve
The median nerve runs from the neck down to the palm side of the hand (thumb, first finger and 1/2 of the middle finger). This nerve is involved in carpal tunnel syndrome. These nerves innervate the forearm flexors.

Ulnar Nerve
The ulnar nerve runs from the neck down to the palm of the hand (pinky, ring finger and 1/2 of the middle finger). This nerve is also known as the "funny bone". As it travels down the arm, it curves around the inside of the elbow; at that point it is close to the surface of the skin and isn't covered by muscle so can be accidentally bumped or hit causing numbness and tingling down the arm and into the hand. This nerve innervated muscles on the pinky side of the hand/forearm.

Radial Nerve
The radial nerve runs from the neck down the back side of the forearm to the hand (thumb, first finger, middle finger and 1/2 of the ring finger). This nerve innervates the muscles that extend the fingers and the wrist.

Elbow BursaBursas are fluid filled sacs that are located in areas to help reduce friction. The main bursa of the elbow is called the Olecranon Bursa. It is located at the point of the elbow. This is often injured when someone falls and/or hits the end of their elbow.

 

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