Is OS Acromiale congenital?

Is os acromiale genetic?

It is a relatively frequent defect affecting 4-18% of most large skeletal series. The etiology of os acromiale is poorly understood, and two competing hypotheses have been proposed: (1) that the accessory bone represents a genetic defect, and (2) that it results from mechanical stress on the developing acromion.

What causes os acromiale?

Causes of os acromiale

The acromion develops from four ossification centers or growth plates. The growth plates generally fuse by age 18 but can fuse as late as age 25. When there is failure of the growth plates to fuse an os acromiale develops.

How common is os acromiale?

The prevalence of os acromiale is 1% to 15%, and is quite common in the African American population. Os acromiale in adults is easily diagnosed by symptoms and X-ray, particularly on the axillary view; however, the differential diagnosis of adolescents may require MRI or SPECT-CT.

What is a os acromiale?

Os acromiale is a developmental aberration in which the distal acromion fails to fuse. This aberration is often discovered incidentally but may present with a clinical picture similar to that of subacromial impingement syndrome.

Can os acromiale be cured?

We concluded that, although it is rare, symptomatic unstable os acromiale does occur and can be effectively treated with use of autogenous bone-grafting and internal fixation with a rigid tension-band construct and cannulated screws.

Does os acromiale cause pain?

Os acromiale is an uncommon cause of shoulder pain with symptoms often resulting from an unstable meso-acromion. The associated pain may be due to impingement from the unfused fragment, a concomitant rotator cuff tear, or gross motion at the os acromiale site.

Can os acromiale be caused by trauma?

Acromial fracture generally results from severe trau- ma, particularly trauma caused by forces directed downward on the superior aspect of the acromion or humeral head forces directed superiorly on the inferior aspect of the acromion.

What is an unfused os acromiale?

Os acromiale is a failure of fusion of the acromial process. It is usually asymptomatic and discovered by chance. When it is painful a differential diagnosis must be made in relation to the subacromial impingement syndrome.

What age does os acromiale fuse?

Discussion. One to three ossification centers of the acromion appear by age 15-18 years, and they normally are fused no later than 25 years of age. Failure of any of these ossification centers to fuse results in an os acromiale.

What happens if shoulder impingement is left untreated?

If left untreated, impingement syndrome can lead to inflammation of tendons (tendinitis) and/or bursa (bursitis). If not treated correctly, the rotator cuff tendons will begin to thin and tear.

Is impingement syndrome chronic or acute?

The pathology of subacromial impingment generally relates to a chronic repetitive mechanical process in which the conjoint tendon of the rotator cuff undergoes repetitive compression and micro trauma as it passes under the coraco-acromial arch [3].

How serious is shoulder impingement?

If left untreated, a shoulder impingement can lead to more serious conditions, such as a rotator cuff tear. Physical therapists help decrease pain and improve shoulder motion and strength in people with shoulder impingement syndrome.