Where is the Acromial angle?
The acromial angle (AA) is a prominent bony point at the lateral border of the acromion and the spine of scapula.
What causes narrowing of the subacromial space?
Anatomical factors that may excessively narrow the subacromial space and outlet to the RC tendons include variations in shape of the acromion, orientation of the slope/angle of the acromion or prominent osseous changes to the inferior aspect of the acromio-clavicular (AC) joint or coracoacromial ligament.
What causes sais?
Causes of SAIS Overuse of the shoulder. Bone spurs on the shoulder bones. One-time injury to the shoulder. Weak muscles of the rotator cuff.
Which is subacromial impingement syndrome?
Subacromial impingement syndrome (SAIS) refers to the inflammation and irritation of the rotator cuff tendons as they pass through the subacromial space, resulting in pain, weakness, and reduced range of motion within the shoulder.
What is an acromial?
Medical Definition of acromion : the outer end of the spine of the scapula that protects the glenoid cavity, forms the outer angle of the shoulder, and articulates with the clavicle. — called also acromial process, acromion process.
What attaches to the acromion angle?
The acromion is a continuation of the scapular spine, and hooks over anteriorly. It articulates with the clavicle (collar bone) to form the acromioclavicular joint.
What nerve is in the subacromial space?
The teres minor is innervated by the axillary nerve, originates on the scapula and inserts on the greater tuberosity. The subacromial space lies underneath the acromion, the coracoid process, the acromioclavicular joint and the coracoacromial ligament.
What nerve runs through the subacromial space?
Distribution of the axillary nerve to the subacromial bursa and the area around the long head of the biceps tendon.
What is the Subcoracoid space?
The space behind and below the coracoid process is termed the ‘subcoracoid space. ‘ It consists of: The articular capsule of the glenohumeral joint (particularly the middle glenohumeral ligament and coracohumeral ligament);
How do you test for subacromial impingement?
Technique. The examiner places the patient’s arm shoulder in 90 degrees of shoulder flexion with the elbow flexed to 90 degrees and then internally rotates the arm. The test is considered to be positive if the patient experiences pain with internal rotation.
What are the characteristics of acromion morphology?
Acromion morphology (types) are based on sagittal oblique MRI: flat inferiorly (12%) 6 curved (56%) parallel to the humeral head with a concave undersurface
How many types of acromial are there?
Acromial types. The shape of the acromion had been initially divided into three types (which was known as the Bigliani classification) 3, to which a fourth has been added 2. They are used as a standardized way of describing the acromion, as well as predicting to a degree the incidence of impingement.
What is the difference between Type 2 and 3 acromion?
Type II acromion is more concave along the undersurface with the inferior acromial cortex parallel to the cortex of the humeral head (Figure 5). Type III acromion has an inferiorly projecting anterior hook, narrowing the space between the acromion and humeral head (Figure 6).
What is the difference between the acromion and acromioclavicular?
The acromion process is a triangular-like extension of the scapular spine, and anteriorly articulates with the clavicle. The acromioclavicular articulation is a synovial joint, connecting the scapula and clavicle, allowing the scapula to have multidirectional motion with relation to the rest of the body.
