In addition, it reduces the interface shear stress between the coating and bone that affects the long term stability of the hip implant.
Soft tissues also play a key role in the static and dynamic stability of the hip: the joint capsule, labrum, ligamentum teres and adjacent myotendinous structures affect joint coaptation; any abnormality or iatrogenic lesion concerning these structures may constitute a risk factor for microinstability.
By preserving the labrum, continued stability of the hip and the sealing function of the labrum might reduce and delay the development of osteoarthritis in the hip.
When hip joint stability was insufficient, stem anteversion or cup anteversion was adjusted to achieve maximum stability of the hip joint.
Over time, a number of different attempts have been made to enhance the stability of the hip joint following hip reconstruction.
After inserting the predetermined (carefully dimensioned) femoral bipolar head, the hip was reduced and the stability of the hip joint was retested.
However, lesser trochanteric osteotomy sacrifices a small part of the proximal femoral structure that is important for the rotational stability of the hip [ 7].
This surgery allows varus angulation of the femoral neck to ensure stability of the hip with internal rotation of the femur proximal to the osteotomy and external rotation distal to the osteotomy [ 10].
At the beginning of our experience with the use of the Judet acrylic head, we were under the influence of these principles and our attention was focused on mobility rather than on the stability of the hip joint.
Bone defect in the posterior wall of the acetabulum and joint incongruence can significantly affect the stability of the hip and lead to high incidence of posttraumatic arthritis [ 17].
Also, an adequate reconstruction of the length of the femoral neck, which can be achieved by using individually designed femoral components, might contribute to good stability of the hip.
