At what age does the acromion fuse?
25 years
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.
When does acromial apophysis fuse?
The acromion develops from three apophyses (ossification centers) that fuse between the ages of 15 and 25 years (Fig 1) (1–3). An unfused apophysis in individuals older than 25 years has been termed os acromiale (1–3).
What age does the scapula fuse?
The scapula ossifies from one primary centre and seven secondary centres. The primary centre appears near the glenoid cavity during the 8th week of development. The 1st secondary centre appears in the middle of coracoid process during the first year and fuses by the 15th year.
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 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.
What does no OS Acromiale mean?
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 is Acromiale?
Abstract. 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.
What bones fuse together as you get older?
As an adult, the skull consists of 26 cranial and facial bones fused together along unmovable joints called sutures, with the exception of the mandible, or jaw, which is attached at a moveable joint.
Is OS acromiale surgery painful?
The pain will be located along the superior aspect of the shoulder. Symptoms can also occur at night. Along with pain, patients may have decreased shoulder motion and strength. Patients will be tender to palpation at the site of the os acromiale and there may also be frank movement of the bone at the site.
How is OS acromiale treated?
Treatment for symptomatic os acromiale is initially nonoperative-activity modification, physical therapy, corticosteroid injection, use of nonsteroidal anti-inflammatory medication.
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.
Is os acromiale surgery painful?