title: Total knee arthroplasty: Effect of obesity and other patients' characteristics on operative duration and outcome.
abstract: OBJECTIVE
  To examine the effects of patients' characteristics mainly obesity on operative duration and other outcome measures of knee arthroplasty.
  
  
  METHODS
  This is a retrospective chart review of 204 patients who had knee arthroplasty within the past five years (2007-2011) at King Abdulaziz Medical City in Riyadh, Kingdom of Saudi Arabia. The data collection form was developed utilizing the literature review to gather all the needed variables. Data were gathered from admission notes, nursing notes, operative reports and discharge summaries.
  
  
  RESULTS
  A feasible sample of 204 patients were included in the study. Of those patients, 155 (76%) were females. The mean age was 70.1 years for males (SD ± 9.4) and 62.7 years (SD ± 8) for females. Regarding the type of total knee replacement (TKR), 163 (79.9%) patients had unilateral TKR and 41 (20.1%) had bilateral TKR. Nine patients (4.4%) had a normal body mass index (BMI) (18.5 to < 25). Overweight patients (BMI 25 to < 30) represented 18.1%. Obesity class I (BMI 30 to < 35) and obesity class II (BMI from 35 to < 40) were present in 23% and 29.9% of the patients, respectively. Morbid obesity (BMI greater than 40) was present in 24.5%. The mean duration of surgery was 126.3 min (SD ± 30.8) for unilateral TKR and 216.6 min (SD ± 55.4) for bilateral TKR.The mean length of stay in the hospital was 12 d (SD ± 4.9). The complications that patients had after the operation included 2 patients (1%) who developed deep venous thrombosis, 2 patients (1%) developed surgical wound infections and none had pulmonary embolism. Patients' characteristics (including age, gender, BMI and co-morbidities) did not have an effect on the operative duration of knee replacement nor the length of hospital stay.
  
  
  CONCLUSIONS
  Our study shows that obesity and other patients' characteristics do not have effect on the operative duration nor the length of hospital stay following TKR.
authors: Abdulaziz Saud Al Turki, Yazeed Al Dakhil, Abdulah Al Turki, Department of Orthopedic Surgery, King Abdulaziz Medical City, National Guard Health Affairs, Riyadh 11426, Kingdom of Saudi Arabia.
authors: Abdulaziz Saud Al
authors: AS
authors: Turki
authors: Abdulaziz Saud Al Turki, Yazeed Al Dakhil, Abdulah Al Turki, Department of Orthopedic Surgery, King Abdulaziz Medical City, National Guard Health Affairs, Riyadh 11426, Kingdom of Saudi Arabia.
authors: Yazeed Al
authors: YA
authors: Dakhil
authors: Abdulaziz Saud Al Turki, Yazeed Al Dakhil, Abdulah Al Turki, Department of Orthopedic Surgery, King Abdulaziz Medical City, National Guard Health Affairs, Riyadh 11426, Kingdom of Saudi Arabia.
authors: Abdulah Al
authors: AA
authors: Turki
authors: Abdulaziz Saud Al Turki, Yazeed Al Dakhil, Abdulah Al Turki, Department of Orthopedic Surgery, King Abdulaziz Medical City, National Guard Health Affairs, Riyadh 11426, Kingdom of Saudi Arabia.
authors: Mazen Saleh
authors: MS
authors: Ferwana
keywords: Arthroplasty; Implantation; Knee; Orthopedics; Replacement; Surgery; Total knee arthroplasty; Total knee replacements