Age Sex VAS1 post VAS2 post Dif VAS1 Dif VAS2 Analg post Difanalg Flexion           -0,484     Dif VAS 1 0,355   0,388           Dif VAS 2       0,470 0,449       Analgesics post   0,539             Dif analgesic           0,385 0,423   Johanson       -0,359     -0,343   DifJohanson       -0,346   -0,714   -0,510 Lequesne       0,480         DifLequesne       0,413   0,679   0,387 Dif Self-care           0,535   0,478 Meters -0,438 -0,377         -0,361   Velocity max -0,522               Slope max -0,357           -0,398   HR max 0,365 0,513     -0,369       Peak VO2 -0,381       -0,333       Peak VO2/kg -0,456               Peak VCO2 -0,339       -0,355       RER max   0,505 -0,476           METS   0,679         0,557   VO2//kg/m   0,539         0,434   VEEQ   -0,348

Table 6: Age, sex and pain correlations with the other variables. VAS1post: Visual Analogue Scale punctuation at rest 6 month postoperative. VAS2post: Visual Analogue Scale punctuation after exercise test 6 month postoperative. Dif VAS1: Differences in Visual Analogue Scale punctuation at rest pre and postoperative. Dif VAS2: Differences in Visual Analogue Scale punctuation after exercise test pre and postoperative. Analg post: Analgesic use 6 month postoperative. Dif analg: Differences in use of analgesics pre and postoperative. HR: Heart Rate. Peak VO2: Maximal Oxygen uptake. Peak VCO2: Carbon dioxide output. RER max: Maximal Respiratory Exchange ratio. VEEQ: Ventilatory Equivalent of Oxygen (VE/VO2).