TABLE 2.

Morphometric data relating to the subacromial bursa

Bursa or landmark of interest (data from 14 specimens, unless stated)	Measurements mean ± SD (range) in cm (or % if stated)
Acromion length	5.1 ± 0.7 (4.3–6.6)
CAL length	3.9 ± 0.6 (2.7–5.2)
SAB roof extent (acromion in situ)
Along acromion, anterior‐posterior	2.9 ± 1.0 (1.6–4.9)
As percentage of acromion length (%)	58.2 ± 21.1 (30.8–100)
Along CAL, anterior‐posterior	3.4 ± 0.7 (1.0–4.1)
As percentage of CAL length (%)	72.0 ± 15.4 (25.0–89.1)
Along lateral edge of acromion and CAL, anterior‐posterior	5.5 ± 1.2 (3.2–7.2)
SAB roof extent (acromion reflected)
On deep surface of acromion
Anterior‐posterior	2.4 ± 0.6 (1.1–2.2)
Medial‐lateral	1.7 ± 0.7 (0.4–2.9)
On deep surface of CAL
Anterior‐posterior (n = 8)	2.6 ± 0.4 (1.9–3.2)
Medial‐lateral (whole width, n = 7)	2.2 ± 0.6 (1.4–3.0)
On deep surface of acromion and CAL
Anterior‐posterior (n = 5)	4.4 ± 0.9 (3.2–5.5)
Lateral extent of SAB floor (acromion in situ)
From anterolateral tip of acromion	4.1 ± 1.1 (2.5–6.0)
From midpoint of acromion (n = 12)	3.4 ± 0.7 (2.4–5.2)
Distance between most lateral extent of SAB and axillary nerve (n = 11)	3.4 ± 1.6 (1.2–6.0)
Medial extent of SAB
From anterolateral tip of acromion (n = 13)	2.4 ± 1.1 (1.1–4.3)
From midpoint of acromion (n = 10) a	2.1 ± 1.0 (0.8–3.6)

Abbreviations: CAL, coracoacromial ligament; SAB, subacromial bursa.

^a Measurements presented include cases in which the most medial extent of the SAB was oriented in a straight line in relation to the fibres of the supraspinatus muscle.