Table 1.
A summary of studies in the literature examining the incidence of os acromiale across different populations
| Author | Year | Type | No. of cases | Methodology | Frequency of os acromiale (%) | Frequency of bilaterality (%) |
|---|---|---|---|---|---|---|
| Gruber5 | 1863 | Anatomical | 100 | Cadaveric dissection | 3.0 | Not reported |
| Macalister6 | 1893 | Anatomical | 100 | Examination of museum specimens | 15.0 | Not reported |
| Edelson et al7 | 1993 | Anatomical | 270 | Specimens from three archaeological sites | 8.2 | Not reported |
| Nicholson et al8 | 1996 | Anatomical | 420 | Examination of museum specimens | 8.0 | 41 |
| Sammarco9 | 2000 | Anatomical | 1198 | Examination of museum specimens | 8.0 | 33 |
| Liberson10 | 1937 | Radiological | 1800 | Sagittal plane radiographs (a modified axillary view for some cases) | 2.7 | 62 |
| Grasso11 | 1992 | Radiological | 398 | Anteroposterior and axillary radiographs and CT | 9.5 | Not reported |
| Burbank12 | 2007 | Radiological | 93 | Anteroposterior, scapular Y and axillary radiographs | 6.5 | Not reported |
| Rovesta et al13 | 2017 | Radiological | 1042 | MRI imaging of shoulder region | 3.4 | Not reported |