Hip Dysplasia Correction: How to perform

Last updated on July 6 2022

Description

Hip dysplasia, developmental dysplasia of the hip (DDH) or congenital dysplasia of the hip (CDH) is a congenital or developmental deformation or misalignment of the hip joint which can be partially or completely dislocated.
Typically, the term DDH is used in patients who are born with dislocation or instability of the hip, which may then result in hip dysplasia. More broadly, DDH may be defined simply as an abnormal growth of the hip. Abnormal development of the hip includes the osseous structures, such as the acetabulum and the proximal femur, as well as the labrum, capsule, and other soft tissues. This condition may occur at any time, from conception to skeletal maturity.
This procedure allows knowing the main measurements needed to correct this deformation or misalignment of the hip joint.

Measurements

The measurements made by the procedure are displayed in the image:

● Acetabular angle (or sharp angle) (AA): angle between the acetabular’s line and the Hilgenreiner’s line;

● Central Edge Angle (CEA): angle between the central edge line and the femoral vertical line;

● Reimer’s Index (RI): A/B x100 where: o A: the horizontal length between the most lateral edge of the femoral head and the Perkin’s line, o B: the horizontal length between the most lateral edge of the femoral head and the most medial edge of the femoral head;

● Delta Angle (DA): angle between the acetabular roof line and the fovea capitis line;

● Centrum Collum Diaphyseal (CCD): angle between the femoral shaft axis and the femoral neck axis.

Auxiliary references

To show this procedure, PeekMed® needs additional references:

• Hilgenreiner’s line: horizontal line through the teardrops (or triradiate cartilage in children) of the acetabulum;
• Perkin’s line: perpendicular line to Hilgenreiner’s line, from the lateral edge of the acetabulum;
• Acetabular line: line passing through the lateral edge of the acetabulum and the teardrops ;
• Central Edge line: line between the lateral edge of the acetabulum and the center of the femoral head;
• Femoral vertical line: perpendicular line to Hilgenreiner’s line that crosses the center of the femoral head;
• Femoral line: line between the most lateral and medial edge of the femoral head;
• Fovea capitis line: line from the fovea capitis to the center of the femoral head;
• Acetabular roof line: line from the medial edge of the acetabular roof to the center of the femoral head;
• Femoral Shaft axis: line that passes through the center of the femoral shaft;
• Femoral Neck axis: line that passes through the center of the femoral head and neck.