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Table 3 Descriptive statistics. Surgical prognostic factors

From: Patient and surgical prognostic factors for inpatient functional recovery following THA and TKA: a prospective cohort study

Surgical factor Total cohort, N = 354 TKA, n = 238 (67.2%) THA, n = 116 (32.8%) p value
Tourniquet duration     N/A
 (mean [SD] min)   59.0 (21.5)
n = 231 (missing n = 7)
 
Tourniquet pressure     N/A
 (mean [SD] mmHg)   292.5 (29.1)
n = 231 (missing n = 3)
 
Surgical approach, N (%)     N/A
 Parapatellar TKA   228 (95.8%)  
 Subvastus TKA   10 (4.2%)  
 Posterior approach THA    71 (61.2%)
 Direct anterior approach THA    22 (19.0%)
 Direct superior approach THA    23 (19.8%)
Robot-assisted surgery, N (%)     0.16
 No 318 (89.8%) 210 (88.2%) 108 (93.1%)
 Yes 36 (10.2%) 28 (11.8%) 8 (6.9%)
Duration of surgery (min)     0.67
 Median (IQR) 79 (70, 93) 79 (71, 91) 79 (67, 100)
 Range (37–178) (37–178) (49–167)
Anaesthetic method, N (%)     
 GA only 97 (27.4%) 57 (23.9%) 40 (34.5%) 0.04*
 GA + spinal LA 198 (55.9%) 145 (60.9%) 53 (45.7%) 0.07
 Sedation + spinal LA 55 (15.5%) 34 (14.3%) 21 (18.1%) 0.35
 Other (intrathecal morphine) 4 (1.1%) 2 (0.8%) 2 (1.7%) N/A
Initial analgesia, N (%)     
 Intra-operative LIA 294 (83.1%) 214 (89.9%) 80 (69.0%) < 0.001*
 PCA 76 (21.5%) 49 (20.6%) 27 (23.3%) 0.56
 Oral analgesia only 27 (7.6%) 7 (2.9%) 20 (17.2%) < 0.001*
 Intra-articular catheter   113 (47.5%) N/A  
 Single-shot regional block   31 (13.0%) N/A  
 Ambulatory regional block   25 (10.5%) N/A  
  1. Missing data: could not be extracted from patient medical chart
  2. GA general anaesthesia, IQR inter-quartile range, LA local anaesthesia, LIA local infiltration analgesia, PCA patient-controlled analgesia, THA total hip arthroplasty, TKA total knee arthroplasty
  3. *Statistical significance assessed at the 0.05 level. p values were derived from an independent-samples t test, Mann-Whitney U test, or chi-square test comparing TKA and THA cohorts, as appropriate for variable type