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.

Acetabular roof arc angle.

These roof arc angle values may be used as a surgical guideline for an acetabular fracture around the 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. 3 article feature images from this case. Measure the roof arc angle with peekmed.

Determine the amount of intact acetabular dome and evaluate the need for surgery. Computerized tomography ct of the superior 10 mm of the acetabular articular surface evaluates the area equivalent to roof arc measurements of 45. Normal values in adults the normal range is 33º to 38º. 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.

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 technique of roof arc measurements was developed to identify the extent of superior acetabulum left intact after fracture. In acetabular fracture a medial roof arc angle less than 46 degrees an anterior roof arc angle less than 52 degrees or posterior roof arc angle less than 61 degrees is considered to be involved in a weight bearing area. Helps to define fracture pattern stability.

At birth it should be less than 28 degrees and should progressively reduce with maturation of the hip. With peekmed a powerful 3d pre operative planning system for. Less than 39 42 and 55 of medial anterior and posterior acetabular roof arc angles involve absawba of the femoral head. 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.

23 24 25 26 these angles are made on the ap obturator and iliac oblique radiographic views. Considered stable if the fracture line exits outside the weight bearing dome of the acetabulum. Roof arc angles are used to assess the size of the intact portion of acetabulum. Defined as 45 on ap obturator and iliac oblique views.