Two main classification systems exist; others are modified approaches of the same principle.
Typing based on subjective observation of the suprascapular notch shape. Introduced by and modified by There are six basic types of scapular notch: • Type I: Notch is absent. The superior border forms a wide depression from the medial angle to the coracoid process. • Type II: Notch is a blunted V-shape occupying the middle third of the superior border. • Type III: Notch is U-shaped with nearly parallel margins. • Type IV: Notch is V-shaped and very small. A shallow groove is frequently formed for the suprascapular nerve adjacent to the notch. • Type V: Notch is minimal and U-shaped with a partially ossified ligament. • Type VI: Notch is a
foramen as the ligament is completely ossified.
Typing based on parametric measurements of depth to upper width ratio of the suprascapular notch Introduced by and modified by There are five basic types of scapular notch: • Type I: Depth larger than upper width. • Type II: Depth equal to upper width. • Type III: Depth is smaller than upper width. • Type IV: Notch is a
foramen. • Type V: Discrete notch. The second method of suprascapular notch typing yields more practical approach in clinical diagnosis of the
suprascapular nerve entrapment. == Clinical significance ==