title: Total knee arthroplasty in Asian subjects: preoperative range of motion determines postoperative range of motion?
abstract: OBJECTIVE
  To evaluate whether preoperative range of motion is a key determinant of postoperative range of motion in Asian patients undergoing conventional total knee arthroplasty.
  
  
  METHODS
  A retrospective review of 302 patients who underwent primary total knee arthroplasty performed by a single surgeon was conducted. Patients who had a fixed flexion deformity of ≥15° were excluded. Postoperative range of motion (ROM) was measured prospectively. Patients were stratified into two groups: preoperative ROM < 110° and preoperative ROM ≥ 110°. Postoperative ROM and mean change in ROM at 6 months and 2 years of follow-up were then compared using Student's t-test.
  
  
  RESULTS
  Group of ROM < 110° had a poorer postoperative range of motion at both 6-months and 2-years of follow-up than Group of ROM ≥ 110° (P < 0.001). Postoperatively, Group of ROM < 110° had gained range of motion whereas Group of ROM ≥ 110° had lost range of motion (P < 0.001).
  
  
  CONCLUSIONS
  Similar to the Western population, preoperative range of motion is a key determinant of postoperative range of motion in Asian patients. This should be taken into consideration by surgeons during preoperative planning and in managing patients' expectations.
authors.affiliation: Department of Orthopaedic Surgery, Singapore General Hospital, Singapore.
authors.forename: Hamid Rahmatullah
authors.initials: HR
authors.lastname: Bin Abd Razak
authors.forename: Xinyun Audrey
authors.initials: XA
authors.lastname: Han
authors.forename: Hwei Chi
authors.initials: HC
authors.lastname: Chong
authors.forename: Hwee Chye Andrew
authors.initials: HC
authors.lastname: Tan
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D019645:Arthroplasty, Replacement, Knee; D001208:Asia / Q000208:ethnology; D005260:Female; D006801:Humans; D007902:Length of Stay; D008297:Male; D008875:Middle Aged; D061646:Operative Time; D020370:Osteoarthritis, Knee / Q000208:ethnology / Q000503:physiopathology / Q000601:surgery; D011182:Postoperative Care; D011300:Preoperative Care; D011446:Prospective Studies; D016059:Range of Motion, Articular / Q000502:physiology*; D012189:Retrospective Studies; D016896:Treatment Outcome
keywords: Outcomes; Preoperative; Range of motion; Total knee arthroplasty