title: Does Cruciate-Retaining Total Knee Arthroplasty Show Better Quadriceps Recovery than Posterior-Stabilized Total Knee Arthroplasty? - Objective Measurement with a Dynamometer in 102 Knees.
abstract: BACKGROUND
  Cruciate-retaining (CR) prostheses have been considered to produce more physiologic femoral rollback, provide better proprioception, and result in better quadriceps recovery than posterior-stabilized (PS) prostheses after total knee arthroplasty (TKA). However, there are very few studies demonstrating these benefits in an objective manner. We investigated whether CR-TKA could result in (1) better quadriceps recovery; (2) a greater proportion of patients with beyond the preoperative level of recovery; and (3) better clinical outcomes than PS-TKA.
  
  
  METHODS
  This was a prospective non-randomized comparative study on the results of CR-TKA and PS-TKA. CR prostheses were used in 51 knees and PS prostheses in 51 knees. Quadriceps force was measured with a dynamometer preoperatively and at postoperative 6 weeks, 3 months, and 6 months consecutively. The Knee Society score (KSS) and range of motion (ROM) were also evaluated.
  
  
  RESULTS
  There were no differences between two groups in terms of the objective quadriceps force during the follow-up period. The proportion of patients with beyond the preoperative level of recovery was similar between groups. Moreover, the KSS and ROM were not significantly different between two groups.
  
  
  CONCLUSIONS
  CR-TKA did not result in better quadriceps recovery than PS-TKA during the 6-month follow-up. In other words, PS-TKA could lead to comparable quadriceps recovery despite greater preoperative weaknesses such as more restricted ROM and more severe degenerative changes of the knee.
authors.affiliation: Department of Medicine, Graduate School, Kyung Hee University, Seoul, Korea.
authors.forename: Kye-Youl
authors.initials: KY
authors.lastname: Cho
authors.affiliation: Department of Orthopaedic Surgery, Center for Joint Diseases and Rheumatism, Kyung Hee University Hospital at Gangdong, Seoul, Korea.
authors.forename: Kang-Il
authors.initials: KI
authors.lastname: Kim
authors.affiliation: Department of Orthopaedic Surgery, College of Medicine, Kyung Hee University, Seoul, Korea.
authors.forename: Sang-Jun
authors.initials: SJ
authors.lastname: Song
authors.affiliation: Department of Orthopaedic Surgery, College of Medicine, Kyung Hee University, Seoul, Korea.
authors.forename: Dae-Kyung
authors.initials: DK
authors.lastname: Bae
mesh_terms: D000368:Aged; D019645:Arthroplasty, Replacement, Knee / Q000379:methods* / Q000706:statistics & numerical data*; D006801:Humans; D008875:Middle Aged; D053580:Muscle Strength / Q000502:physiology; D053581:Muscle Strength Dynamometer; D016119:Posterior Cruciate Ligament / Q000601:surgery*; D011446:Prospective Studies; D052097:Quadriceps Muscle / Q000601:surgery*; D016059:Range of Motion, Articular / Q000502:physiology
keywords: Muscle strength; Muscle strength dynamometer; Quadriceps muscle; Total knee arthroplasty