A novel constrained acetabular liner design with increased range of motion.
One treatment strategy for recurrent dislocation after total hip arthroplasty is the use of a constrained acetabular component. A major drawback of currently available constrained components is the limited range of motion (ROM). We present a novel constrained component that employs a monopolar, highly cross-linked polyethylene liner with cutouts oriented to allow increased ROM, while maintaining constraint against dislocation. ROM and lever-out tests comparing this novel design with a conventional constrained component showed that the cutaway monopolar component allowed ROM substantially greater than a currently available design. The lever-out torque for the cutaway monopolar constrained component was 243% higher than the conventional constrained component. This novel constrained acetabular component offers promise for providing excellent constraint against dislocation, while maintaining a wide ROM.
Burroughs
B R
BR
Orthopaedic Biomechanics and Biomaterials Laboratory, Massachusetts General Hospital, Boston, Massachusetts 02114, USA.
Golladay
G J
GJ
Hallstrom
B
B
Harris
W H
WH
D000077:Acetabulum; D019644:Arthroplasty, Replacement, Hip / Q000295:instrumentation*; D006617:Hip Dislocation / Q000517:prevention & control; D006622:Hip Prosthesis; D006801:Humans; D011095:Polyethylenes; D011183:Postoperative Complications / Q000517:prevention & control; D011474:Prosthesis Design; D011475:Prosthesis Failure; D016059:Range of Motion, Articular / Q000502:physiology*; D019415:Torque
D011095:Polyethylenes