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Table 1 Demographics of all subjects and baseline data for measurement parameters, before and after total knee arthroplasty

From: A new method for evaluation of patellar height and the position of the joint line before and after total knee arthroplasty

  Frequency-n (%) Mean ± standard deviation P value
Pre-operation Post-operation
Patients number 167    
Males 34 (20.4)    
Females 133 (79.6)    
Knees number 175    
Left 95 (54.3)    
Right 80 (45.7)    
Age at surgery   64.22 ± 6.52 (years)  
IS   0.99 ± 0.15 0.99 ± 0.16 0.638
mIS   1.53 ± 0.17 1.52 ± 0.17 0.636
CD   0.86 ± 0.12 0.74 ± 0.13 0.000
BP   0.79 ± 0.13 0.72 ± 0.13 0.000
AP   1.34 ± 0.17 1.35 ± 0.16 0.214
jAP   0.99 ± 0.14 0.93 ± 0.14 0.000
JLH   10.89 ± 3.12 14.06 ± 3.07 0.000
PTS   9.09 ± 3.53 8.97 ± 2.43 0.684
JLH (post-pre)   3.17 ± 3.06 (mm)  
  1. IS Insall-Salvati, mIS Modified Insall-Salvati, CD Caton-Deschamps, BP Blackburne-Peel, AP Axis-patella, jAP Joint axis-patella, JLH Height of the joint line, PTS Posterior tibial slope, JLH (post-pre) difference of JLH between post-operation and pre-operation