The Hip - book

Acetabular Component Revision

THR menu / Revision THR acetabular component Discussion note that some of the problems seen in dysplasia are frequently encountered in revision THR; indications for acetabular revision: sepsis, component malposition, impingement, polyethylene wear, pelvic osteolysis, recurrent dislocation, progressive protrusio, and component loosening; evaluation of the painful THR examination: examination for loosening previoius incisions; contracture of … Read more

Acetabular Component Position

Discussion restoration of normal hip center in acetabular reconstruction encourages restoration of normal biomechanics; placing the socket laterally creates increased joint reactive force, and placing it directly superior requires the use of a long neck prosthesis to restore abductor moment arm; long neck prosthesis will develop increased lateral bending stresses, adapting to the activities of … Read more

Acetabular Component Loosening

(see also: acetabular component Loosening of Press Fit Acetabular Components (press fit acetabular components) normal bone ingrowth generally for bone ingrowth to occur, the component must lie with 50 micrometers of the acetabulum, inorder for host bone ingrowth to occur; as noted by Bloebaum RD, et al (1997), bone ingrowth into component averages only 12%, … Read more