title: Evaluation of the relationship between anteroposterior translation of a posterior cruciate ligament-retaining total knee replacement and functional outcome.
abstract: The success of total knee replacement (TKR) depends   on optimal soft-tissue balancing, among many other factors. The   objective of this study is to correlate post-operative anteroposterior   (AP) translation of a posterior cruciate ligament-retaining TKR   with clinical outcome at two years. In total 100 patients were divided   into three groups based on their AP translation as measured by the   KT-1000 arthrometer. Group 1 patients had AP translation < 5   mm, Group 2 had AP translation from 5 mm to 10 mm, and Group 3 had   AP translation > 10 mm. Outcome assessment included range of movement   of the knee, the presence of flexion contractures, hyperextension,   knee mechanical axes and functional outcome using the Knee Society   score, Oxford knee score and the Short-Form 36 questionnaire. At two years, patients in Group 2 reported significantly better   Oxford knee scores than the other groups (p = 0.045). A positive   correlation between range of movement and AP translation was noted,   with patients in group 3 having the greatest range of movement (mean   flexion: 117.9° (106° to 130°)) (p < 0.001). However, significantly   more patients in Group 3 developed hyperextension > 10° (p = 0.01). In this study, the best outcome for cruciate-ligament retaining   TKR was achieved in patients with an AP translation of 5 mm to 10   mm.
authors.affiliation: Singapore General Hospital, Department of Orthopaedic Surgery, Outram Road, 169608, Singapore. ben_seah@hotmail.com
authors.forename: R B
authors.initials: RB
authors.lastname: Seah
authors.forename: H N
authors.initials: HN
authors.lastname: Pang
authors.forename: N N
authors.initials: NN
authors.lastname: Lo
authors.forename: H C
authors.initials: HC
authors.lastname: Chong
authors.forename: P L
authors.initials: PL
authors.lastname: Chin
authors.forename: S L
authors.initials: SL
authors.lastname: Chia
authors.forename: S J
authors.initials: SJ
authors.lastname: Yeo
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D019645:Arthroplasty, Replacement, Knee; D005260:Female; D006801:Humans; D007719:Knee Joint / Q000503:physiopathology / Q000601:surgery*; D007720:Knee Prosthesis; D008297:Male; D008875:Middle Aged; D020370:Osteoarthritis, Knee / Q000601:surgery*; D016119:Posterior Cruciate Ligament