title: [Effect of preoperative factors on the clinical outcome of total knee arthroplasty].
abstract: OBJECTIVE
  To analyze the effect of preoperative factors on the clinical outcome in patients receiving total knee replacement.
  
  
  METHODS
  From January 2011 to September 2013, 145 patients (206 knees; 22 males, 31 knees; 123 females, 175 knees)receiving total knee arthroplasty were successfully included in this study and followed up. The average ages was (66.5±7.6) years old(range, 51-83 years old). The data of preoperative factorsincludedgender, age, body mass index (BMI), preoperative range of motion (ROM), the knee varus angle, flexion deformity and preoperative the hospital for special surgery (HSS) scorewere collected. The correlation between preoperative factors and the clinical outcome (postoperative HSS score, postoperative ROM)after total knee replacement was evaluated statistically.
  
  
  RESULTS
  The average follow-up time was 35 months (range, 24-56 months). The HSS score was increased from (55.1±7.6) preoperativelyto (89.3±5.1) postoperatively. ROM elevated from (95.6±10.0)°preoperatively to (115.1±7.8)° postoperatively.The correlation analysis showed that the postoperative ROM was positively correlated with the preoperative ROM, and was negatively correlated with the BMI, the knee varus angle(r=-0.864, -0.353, all P<0.01). The postoperative HSS score was positively correlated with preoperative ROM, preoperative HSS score(r=0.101, 0.244, P=0.033, P<0.01), and was negatively correlated with the BMI (r=-0.277, P=0.039).
  
  
  CONCLUSIONS
  Total knee arthroplasty can definitely improve the function of knee joint. The BMI, the preoperative ROM, the knee varus angle and preoperative HSS score have influence on postoperative function of patients receiving total knee arthroplasty.
authors.affiliation: Department of Orthopedics, Peking Union Medical College Hospital, Peking Union Medical College, Chinese Academy of Science, Beijing 100730, China.
authors.forename: Hengyan
authors.initials: H
authors.lastname: Zhang
authors.forename: Liqiang
authors.initials: L
authors.lastname: Cui
authors.forename: Xisheng
authors.initials: X
authors.lastname: Weng
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D019645:Arthroplasty, Replacement, Knee; D015992:Body Mass Index; D005260:Female; D006801:Humans; D007717:Knee; D007719:Knee Joint; D007720:Knee Prosthesis; D008297:Male; D008875:Middle Aged; D011184:Postoperative Period; D011300:Preoperative Care; D016059:Range of Motion, Articular