Abstract
Background
Acetabular fracture involves whether superior articular weight bearing area and stability of the hip are assessed by acetabular roof arc angles comprising medial, anterior and posterior. Many previous studies, based on clinical, biomechanics and anatomic superior articular surface of acetabulum showed different degrees of the angles. Anatomic biomechanical superior acetabular weight bearing area (ABSAWBA) of the femoral head can be identifed as radiographic subchondral bone density at superior acetabular dome. The fracture passes through ABSAWBA creating traumatic hip arthritis. Therefore, acetabular roof arc angles of ABSAWBA were studied in order to fnd out that the most appropriate degrees of recommended acetabular roof arc angles in the previous studies had no ABSAWBA involvement.
Materials and Methods
ABSAWBA of femoral head was identifed 68 acetabular fractures and 13 isolated pelvic fractures without unstable pelvic ring injury were enrolled. Acetabular roof arc angle was measured on anteroposterior, obturator and iliac oblique view radiographs of normal contralateral acetabulum using programmatic automation controller digital system and measurement tools.
Results
Average medial, anterior and posterior acetabular roof arc angles of the ABSAWBA of 94 normal acetabulum were 39.09 (7.41), 42.49 (8.15) and 55.26 (10.08) degrees, respectively.
Conclusions
Less than 39°, 42° and 55° of medial, anterior and posterior acetabular roof arc angles involve ABSAWBA of the femoral head. Application of the study results showed that 45°, 45° and 62° from the previous studies are the most appropriate medial, anterior and posterior acetabular roof arc angles without involvement of the ABSAWBA respectively.
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Harnroongroj, T., Wattanakaewsripetch, M., Sudjai, N. et al. Acetabular roof arc angles and anatomic biomechanical superior acetabular weight bearing area. IJOO 48, 484–487 (2014). https://doi.org/10.4103/0019-5413.139858
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DOI: https://doi.org/10.4103/0019-5413.139858
Key words
- Acetabular radiographs
- acetabular roof arc angles
- anatomic biomechanicalsuperior acetabular weight bearing area