Many previous studies based on clinical biomechanics and anatomic superior articular surface of acetabulum showed different degrees of the angles.
Roof arc angle acetabular fracture.
Roof arc angle angle between vertical line through femoral head and line through fracture helps to define fracture pattern stability considered stable if the fracture line exits outside the weight bearing dome of the acetabulum.
Acetabular fracture displacement and roof arc angles converted into a roof arc score were assessed and correlated with clinical outcome at 2 years follow up.
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.
For surgically treated fractures with residual steps and diastases after operation the correlation between steps and 2 year outcome was good.
The medial roof arc angle was 46 6 3 anterior roof arc angle was 52 7 0 and posterior roof arc angle was 62 8 5.
The medial roof arc angle was 46 6 3 degrees anterior roof arc angle was 52 7 0 degrees and posterior roof arc angle was 62 degrees 8 5 degrees.
Such fractures divide the acetabulum into an upper portion ilium with the roof and a lower portion ischium and pubis.