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Table 1 Patients’ demographic data

From: Timing of periarticular injection has no effect on postoperative pain and functional recovery in simultaneous bilateral total knee arthroplasty: a prospective randomized, double-blinded trial

Demographic data Values P-value
Number of patients 48  
Agea (years) 62.9 ± 5.8  
Gender (male: female) 3: 45  
BMIa (kg/m2) 25.9 ± 3.3  
Length of staya (days) 7.3 ± 1.4  
The side of the first operated knee (right: left) 24: 24  
The timing of PMDI for the first knee (late: early) 24: 24  
Preoperative VASa
 Late PMDI 6.8 ± 2.5  
 Early PMDI 6.7 ± 1.9 0.77
Preoperative degrees of active knee flexiona
 Late PMDI 114.6 ± 19.1  
 Early PMDI 114.9 ± 18.3 0.90
  1. aData are presented as mean and standard deviation (SD)
  2. Late PMDI, the knees injected with the PMDI before prosthetic implantation as common practice of surgeons
  3. Early PMDI, the knees injected with the PMDI after arthrotomy to prevent neural hypersensitization caused by further soft tissue and bone work during TKA