TY - JOUR
T1 - Dislocation after total hip arthroplasty
T2 - implant design and orientation.
AU - Barrack, Robert L.
PY - 2003
Y1 - 2003
N2 - Implant design and positioning are important factors in maintaining stability and minimizing dislocation after total hip arthroplasty. Although the advent of modular femoral stems and acetabular implants increased the number of head, neck, and liner designs, the features of recent designs can cause intra-articular prosthetic impingement within the arc of motion required for normal daily activities and thus lead to limited motion, increased wear, osteolysis, and subluxation or dislocation. Minimizing impingement involves avoiding skirted heads, matching a 22-mm head with an appropriate acetabular implant, maximizing the head-to-neck ratio, and, when possible, using a chamfered acetabular liner and a trapezoidal, rather than circular, neck cross-section. Computer modeling studies indicate the optimal cup position is 45 degrees to 55 degrees abduction. Angles <55 degrees require anteversion of 10 degrees to 20 degrees of both the stem and cup to minimize the risk of impingement and dislocation.
AB - Implant design and positioning are important factors in maintaining stability and minimizing dislocation after total hip arthroplasty. Although the advent of modular femoral stems and acetabular implants increased the number of head, neck, and liner designs, the features of recent designs can cause intra-articular prosthetic impingement within the arc of motion required for normal daily activities and thus lead to limited motion, increased wear, osteolysis, and subluxation or dislocation. Minimizing impingement involves avoiding skirted heads, matching a 22-mm head with an appropriate acetabular implant, maximizing the head-to-neck ratio, and, when possible, using a chamfered acetabular liner and a trapezoidal, rather than circular, neck cross-section. Computer modeling studies indicate the optimal cup position is 45 degrees to 55 degrees abduction. Angles <55 degrees require anteversion of 10 degrees to 20 degrees of both the stem and cup to minimize the risk of impingement and dislocation.
UR - http://www.scopus.com/inward/record.url?scp=0037822087&partnerID=8YFLogxK
U2 - 10.5435/00124635-200303000-00003
DO - 10.5435/00124635-200303000-00003
M3 - Review article
C2 - 12670135
AN - SCOPUS:0037822087
SN - 1067-151X
VL - 11
SP - 89
EP - 99
JO - The Journal of the American Academy of Orthopaedic Surgeons
JF - The Journal of the American Academy of Orthopaedic Surgeons
IS - 2
ER -