Acetabular Roof Arc Angle

The technique of roof arc measurements was developed to identify the extent of superior acetabulum left intact after fracture.

Acetabular roof arc angle.

The acetabular angle is a plain film measurement used when evaluating developmental dysplasia of the hip ddh which is measured between hilgenreiner s line and a line parallel to the acetabular roof. Determine the amount of intact acetabular dome and evaluate the need for surgery. At birth it should be less than 28 degrees and should progressively reduce with maturation of the hip. 3 article feature images from this case.

Normal values in adults the normal range is 33º to 38º. Conclusions in acetabular fracture a medial roof arc angle less than 46 an anterior roof arc angle less than 52 or posterior roof arc angle less than 61 is considered to be involved in a weight bearing area. 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. Helps to define fracture pattern stability.

23 24 25 26 these angles are made on the ap obturator and iliac oblique radiographic views. These roof arc angle values may be used as a surgical guideline for an acetabular fracture around the weight bearing area. 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. Measure the roof arc angle with peekmed.

Defined as 45 on ap obturator and iliac oblique views. Roof arc angles are used to assess the size of the intact portion of acetabulum. In acetabular fracture a medial roof arc angle less than 46 an anterior roof arc angle less than 52 or posterior roof arc angle less than 61 is considered to be involved in a weight bearing area. With peekmed a powerful 3d pre operative planning system for.

Considered stable if the fracture line exits outside the weight bearing dome of the acetabulum. Computerized tomography ct of the superior 10 mm of the acetabular articular surface evaluates the area equivalent to roof arc measurements of 45. The acetabular angle using hilgenreiner s line should be less than 28º at birth. Roof arc angle angle between vertical line through femoral head and line through fracture.