The anterior-posterior laxity after total knee arthroplasty inserted with a ligament tensor.
Goal of this study is to determine the anterior-posterior laxity in 30 degrees of knee flexion for a posterior cruciate retaining total knee arthroplasty with a relative dished insert and implanted with a ligament tensor. Furthermore, the correlation between these AP laxities and the postoperative range of motion (ROM) and postoperative Knee Society Score (KSS) is analysed. Fifty-one balanSys total knee arthroplasties were performed in 49 patients between 1998 and 2000. These arthroplasties are analysed with respect to AP laxity (Rolimeter), ROM and KSS with a mean follow-up of 4.6 years. The mean anterior laxity is 2.8 mm with no posterior laxities at all. The average postoperative ROM is 110 degrees with an average KSS of 142. No correlations between AP-laxity and postoperative ROM or between AP-laxity and postoperative KSS are found. A posterior cruciate retaining TKA with a relative dished insert and implanted with a tensor is very stable in the anterior-posterior direction in 30 degrees of knee flexion. This limited laxity does not seem to disadvantage the mean postoperative ROM and KSS, when compared to other TKA studies.
van Hal
C T H
CT
Department of Orthopedics, Sint Maartenskliniek, Nijmegen, The Netherlands.
van Hellemondt
G G
GG
Wymenga
A B
AB
Jacobs
W C H
WC
D000368:Aged; D000369:Aged, 80 and over; D019645:Arthroplasty, Replacement, Knee / Q000295:instrumentation*; D005260:Female; D005269:Femur / Q000601:surgery; D005500:Follow-Up Studies; D006801:Humans; D007593:Joint Instability / Q000209:etiology*; D007595:Joint Prosthesis; D007719:Knee Joint / Q000503:physiopathology*; D008297:Male; D008875:Middle Aged; D016119:Posterior Cruciate Ligament / Q000503:physiopathology; D011183:Postoperative Complications; D011474:Prosthesis Design; D016059:Range of Motion, Articular / Q000502:physiology*; D013499:Surface Properties; D013977:Tibia / Q000601:surgery