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What Is Distal Clavicle Osteolysis?

L. Whitaker
L. Whitaker

Distal clavicle osteolysis, also known as weight lifter's shoulder, is a shoulder injury affecting the acromioclavicular (AC) joint. It is most commonly associated with contact sports in which high stresses are placed on the clavicle, or collar bone. The exact cause, however, is not known. Symptoms can appear slowly and include a dull aching over the AC joint, reduced mobility, stiffness and swelling in the shoulder, and reduced strength. Symptoms can worsen with continued activity.

Osteolysis refers to the loss of minerals, such as calcium, in the bone, causing a softening or dissolution of the bone. In distal clavicle osteolysis, the end, or distal part, of the clavicle begins to slowly break down and dissolve. This can be caused by a single injury to the AC joint, smaller repetitive injuries, repetitive stresses on the AC joint such as in weight lifting, or a pre-existing disease that might affect the mineralization of the bone structure, such as rheumatoid arthritis.

A human skeleton, including the clavicles in red.
A human skeleton, including the clavicles in red.

Changes in the bone structure happen over time but can usually be diagnosed with the aid of x-rays and a patient history. Treatment depends on the amount of bone loss. In most cases, avoidance of symptomatic activity or modification of activities, in conjunction with anti-inflammatory medicines and ice can allow the clavicle to remineralize. This process can take up to two years to fully resolve. Symptoms often return if previous activities are resumed.

The clavicle, also called the collar bone, connects the shoulder to the sternum.
The clavicle, also called the collar bone, connects the shoulder to the sternum.

Surgery might be required if the bone does not remineralize, or if a patient is unable or unwilling to limit his or her activity. The most common form of surgery for distal clavicle osteolysis is a distal clavicle resection, or arthroscopic distal clavicle resection, in which the affected portion of the bone is removed. Post-operative healing times vary, but limited range of motion can return within one to two weeks following surgery.

Rest and ice are two treatments that will be used for a distal clavicle osteolysis.
Rest and ice are two treatments that will be used for a distal clavicle osteolysis.

The condition can be prevented in some cases. Experts recommend cessation of all exacerbating activities as soon as AC joint pain presents itself. For those playing contact sports, extra padding is recommended. Weight lifters can avoid injury by taking a narrower grip on the bar and avoid the locking or overextension of the elbows.

The first recorded injury of distal clavicle osteolysis was in 1936. In this case, an air hammer operator presented with a sore shoulder and no obvious trauma. Occurrences of these injuries increased as both awareness and the popularity of competitive sports increased.

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    • A human skeleton, including the clavicles in red.
      By: dimdimich
      A human skeleton, including the clavicles in red.
    • The clavicle, also called the collar bone, connects the shoulder to the sternum.
      By: joshya
      The clavicle, also called the collar bone, connects the shoulder to the sternum.
    • Rest and ice are two treatments that will be used for a distal clavicle osteolysis.
      By: absolutimages
      Rest and ice are two treatments that will be used for a distal clavicle osteolysis.
    • The clavicle, which connects the shoulder to the upper torso, is a horizontal bone that's visible on most people.
      By: Artem Furman
      The clavicle, which connects the shoulder to the upper torso, is a horizontal bone that's visible on most people.
    • Reduced mobility, stiffness, and swelling in the shoulder are symptomatic of a distal clavicle osteolysis.
      By: Photographee.eu
      Reduced mobility, stiffness, and swelling in the shoulder are symptomatic of a distal clavicle osteolysis.
    • Most injuries to the acromioclavicular joint occur during sports or exercising.
      By: Hunor Kristo
      Most injuries to the acromioclavicular joint occur during sports or exercising.
    • Rheumatoid arthritis may be an underlying condition that causes osteolysis.
      By: rob3000
      Rheumatoid arthritis may be an underlying condition that causes osteolysis.
    • The victim of an acromioclavicular joint injury may benefit from physical therapy.
      By: alexp3
      The victim of an acromioclavicular joint injury may benefit from physical therapy.
    • Changes to the clavicle bone over time may be diagnosed using an X-ray.
      By: eAlisa
      Changes to the clavicle bone over time may be diagnosed using an X-ray.