title: Differences in articular track area of posterior-stabilized and cruciate-retaining retrieved total knee implants.
abstract: Press-fit condylar total knee arthroplasties removed at revision surgery from 27 knees were examined. Fourteen of the implants were posterior-stabilized press-fit condylar systems and 13 were cruciate-retaining press-fit condylar systems. The articular track areas were examined using a digital camera and manual measurements. Findings revealed the track area in posterior-stabilized implants (93%) was larger than in cruciate-retaining implants (59%). Mean posterior distance ratio of the articular track from the posterior limit of the polyethylene was 2% (.08 cm) for posterior-stabilized implants versus 23% (.97 cm) for cruciate-retaining implants. No differences in wear rating were noted. The pattern of articular contact in cruciate-retaining knees demonstrated little migration of the femoral contact surface across the tibial polyethylene plateau.
authors.affiliation: Dept of Orthopedics, Brown Medical School, COOP 1st Floor, Rhode Island Hospital, 2 Dudley St, Providence, RI 02903, USA.
authors.forename: Michael P
authors.initials: MP
authors.lastname: Bradley
authors.forename: Michael B
authors.initials: MB
authors.lastname: Mayor
authors.forename: John P
authors.initials: JP
authors.lastname: Collier
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001696:Biomechanical Phenomena; D005260:Female; D006801:Humans; D007720:Knee Prosthesis; D008297:Male; D008875:Middle Aged; D020959:Polyethylene; D011474:Prosthesis Design; D013314:Stress, Mechanical
chemical_list: D020959:Polyethylene