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Anterior Labrum

The morphology of the labrum in this region is highly variable, with many shapes having been described [Table 9]. [6,28,33-35]

From our study, Two morphological types of anterior labrum were noted: a small yet well defined labrum and an enlarged labrum, with the former being more commonly encountered than the latter. No other study [6,22-25] has mentioned the prevalence of the different morphological types of anterior labrum obtained in this study [Table 10].       

Table 9 – Variation in the morphology of the anterior labrum

Description of Variant

% Prevalence

 

Triangular

Not specified – CT Arthrography [33]

64% – MR Arthrography [28]

45 %  - MR Imaging [32]

50% - MR Imaging [35]

 

Round

Not specified – CT Arthrography [33] 17% - MR Arthrography [28]

19% - MR Imaging [32]

 Not specified – MR Imaging [35]

 

Flat

2% - MR Arthrography [28]

6% - MR Imaging [35]

7% - MR Imaging [32]

 

Cleaved

Not specifiedCT Arthrography [33] 11% - MR Arthrography [28]

0% - MR Imaging [35]

15% – MR Imaging [32]

 

Notched

Not specifiedCT Arthrography [33]

3% - MR Arthrography [28]

2% - MR Imaging [35]

8% – MR Imaging [32]

 

Crescent

Not specified  – MR Imaging [35]

 

Enlarged or Redundant

Not specified – Arthroscopy [33]

Not specifiedCT Arthrography [33]

 

Unattached

6%  – MR Imaging [35]

 

Absent

Not specified – Arthroscopy [34]

2% - MR Arthrography [28]

6% - MR Imaging [32]

6%  - MR Imaging [35]

 

Anterior labrum “…small yet well defined”. [34]

Not specified  - Arthroscopy [34]

Not specified - CT Arthrography [33]

 

The presence of a sulcus between the articular cartilage of the glenoid and a well developed anterior labrum [33]

Not specified - Arthroscopy [34]

Not specified – CT Arthrography [33]

Strangely shaped anterior labrum

 

Not specified – CT Arthrography [33]

Meniscoid appearance - a space is present between the labrum and the articular cartilage.

< 5% - Arthroscopy [6]

 

Thin anterior labrum

Not specified - CT Arthrography [33]

 

Table 10 – Results form our review of Anterior labral variants

 

No.

%

Prevalence

 

 

Present

132

100%

Absent

0

0%

Morphology – Anterior labrum

 

 

Enlarged

9

6.8%

Redundant

0

0%

Small yet well defined

123

93.2%

Sulcus between articular cartilage

0

0%

and a well developed labrum

 

 

Meniscoid

0

0%

Other

0

0%

 

 

 

 

 

 

 

 

Large anterior labrum Large Anterior Labrum (arrow)

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