What is bigliani classification?
In 1986, Bigliani and colleagues [3] were the first to classify acromial morphology and correlate it with rotator cuff tears. They described three types of acromion: Type I (flat), Type II (curved), and Type III (hooked) (Fig. 1).
What is Type 2 morphology?
The type II acromion is more curved and downward dipping, and the type III acromion is hooked and downward dipping, obstructing the outlet for the supraspinatus tendon.3 Cadaveric studies have shown an increased incidence of rotator cuff tears in persons with type II and type III acromions.2,3.
What are the types of acromion morphology?
Acromial morphology was classified into four types: type-I (flat), type-II (curved), and type-III (hooked) and type-IV (convex or upturned) (Fig. 1) 7, 8, 9, 10.
What is a Type 4 acromion?
In this report, a fourth type of acromion is described in which the undersurface is convex near its distal end. The frequency of a type 4 acromion in the normal population is discussed based on a retrospective review of the MR examinations of 30 patients that originally were read as normal.
What is supraspinatus muscle?
The supraspinatus muscle, the most superiorly located of the rotator cuff muscles, resides in the supraspinous fossa of the scapula, superior to the scapular spine.
What is the supraspinatus tendon?
The supraspinatus tendon is located on the back of your shoulder and helps your arm to move throughout its full range of motion – and helps with power and strength.
Is type 2 acromion serious?
A person with a type II or type III acromion would be at a higher risk of impingement due to the narrowing of the acromiohumeral gap and bursal space. In addition to the above, with advancing age people tend to develop a bone spur on the front and side of the acromion.
What is the most common type of acromion?
In acromion, type I (flat shape) and type II (curved shape) are the most common types accounting for 47.26% and 49.66%. But type III (hooked shape) only represents 3.08% (Figure 3). Three types of acromions according to Bigliani et al. (1986) (a) Flat: type I.
What does acromion type 2 mean?
A type I acromion has a flat undersurface and is least often associated with rotator cuff disease (Fig. 6a). A type II acromion has a concave curved undersurface, and represents a moderate risk for impingement syndrome (Fig. 6b). A type III acromion has a hooked downward facing leading edge (Fig.
Why is supraspinatus most commonly injured?
The supraspinatus tendon is the most commonly injured tendon of the four tendons because it lies predominantly in the space between the acromion and the humeral head.
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