Detailed Instructions: Given a passage, construct a question on the basis of the information present in the passage. Construct the question in such a way that (i) it is unambiguous, (ii) it is answerable from the passage, (iii) its answer is unique (iv) it answer uses text phrases from the passage. Avoid creating questions that (i) can't be answered correctly without actually understanding the passage and (ii) uses the same words or phrases given in the passage.
Problem:Certain aspects of total knee arthroplasty (TKA) in severely and morbidly obese (SMO) patients (BMI 35 kg/m(2)) remain controversial. This study aimed to assess the duration of TKA surgery and hospital stay in relation to patients' BMI.", 'Three operative times during TKA surgery were recorded: tourniquet time, to determine surgical difficulty, total surgical time, to assess the difficulty of achieving anaesthesia, and time in the surgical area, to assess patient management in the surgical area. Length of hospital stay was also calculated. Data were collected prospectively from consecutive patients and were recorded in a database for retrospective analysis.', 'Data were obtained from 922 consecutive patients undergoing TKA. The non-obese group comprised 418 patients (45.3%), obese group Class I 331 (36%), and the SMO group (Class II-III) 173 (18.7%). Mean tourniquet time was 53 min, mean total surgical time was 84 min, and mean time in the surgical area was 132 min. There were no differences according to BMI group. Median length hospital stay (LHS) was 6 days in all patients regardless of BMI. Factors that significantly prolonged LHS were ASA III-IV and pre-operative haemoglobin between 12 and 13 g/dl.
Solution:
Does severe and morbid obesity ( BMI 35 kg/m ( 2 ) ) increase surgical time and length of hospital stay in total knee arthroplasty surgery?