TABLE 2.
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.
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.