J Orthop Res 2008 Apr;26(4):443-52
Scientific Affairs, Stryker Europe, Thalwil, Switzerland.
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J Orthop Res 1998 Jul;16(4):513-7
Department of Orthopaedic Surgery, Akita Red Cross Hospital, Akita City, Japan.
A three-dimensional computer-aided design model of a total hip replacement was used to study the effects of anteversion and abduction of the acetabular component and anteversion and varus-valgus angulation of the femoral component on the range of hip flexion and extension that could be obtained without component impingement. Impingement of the component was defined as impingement between the neck of the femoral component and the edge of the acetabular component. To achieve an angle of hip flexion greater than 90 degrees and an extension angle greater than 30 degrees without component impingement, the optimal angulations were found to be between 1 and 30 degrees of anteversion and 30 and 50 degrees of abduction of the acetabular component, as well as 10 degrees of anteversion of the femoral component. Read More
J Bone Joint Surg Am 2000 Mar;82(3):315-21
Division of Orthopaedic Surgery, Scripps Clinic, La Jolla, California 92037, USA.
Background: Prosthetic impingement due to poor positioning can limit the range of motion of the hip after total hip arthroplasty. In this study, a computer model was used to determine the effects of the positions of the acetabular and femoral components and of varying head-neck ratios on impingement and range of motion.
Methods: A three-dimensional generic hip prosthesis with a hemispherical cup, a neck diameter of 12. Read More
J Biomech 2011 Jun 6;44(9):1810-3. Epub 2011 May 6.
Department of Mechanical Engineering, University of Hyogo, Shosha 2167 Himeji city, 671-2280 Himeji, Japan.
Quantifying soft-tissue tension around the hip joint during total hip arthroplasty remains difficult. In this study, a three-dimensional computer-aided design model was developed to clarify how component position in total hip arthroplasty contributes to the primary cause of posterior dislocation in cases of flexion, adduction and internal rotation. To better understand the influences of anteversion angle of the acetabular component, its effects on the primary causes of dislocations and the range of motion were investigated. Read More
J Arthroplasty 2010 Dec 21;25(8):1275-81.e1. Epub 2009 Dec 21.
Baylor College of Medicine, Houston, Texas, USA.
Impingement, both prosthetic and bony, precedes the vast majority of dislocations after total hip arthroplasty and may adversely impact component wear. Reconstructed computer hip models of 8 subjects were used to evaluate hip range of motion for activities of daily living (ADLs) associated with posterior instability and anterior instability. Variables examined included acetabular position, femoral offset, and head size. Read More