Jordy van Sambeeck

Chapter 5 76 The mean VAS for pain at rest was 19 while this was 38 during activity. The mean VAS for overall satisfaction was 66. The mean KKS was 73 and the mean SF-36 general health perception was 72 (table 1). In our cohort of patients with a mean age of 19.8 years (range 12.5-46.3) at surgery, multivariable regression analysis (Table 2-7) revealed a correlation between age at time of surgery and VAS pain at rest. The VAS pain score at rest increased with 0.95 (0-100 scale) with every year of age at time of surgery (P 0.025). Recurrence of instability was seen in 13 (10%) knees. Risk factor (independent variable) Multivariable regression coefficient (95% CI) P-value Age at time of surgery 0.95 (0.12;1.8) 0.025 Female 12.7 (1.1;24.3) 0.032 Previous procedures performed 10.3 (-3.9;24.5) 0.15 Patellar height 0.12 (-23.0;23.2) 0.99 Trochlear dysplasia A or C vs. B or D -2.5 (-13.8;8.8) 0.66 Additional MPFL reconstruction -2.8 (-24.7;19.1) 0.80 Additional tibial tubercle transfer -0.52 (-10.0;9.0) 0.91 Table 2. Results of multivariable regression analysis for VAS pain rest as dependent variable. CI: confidence interval. Bold risk factor: statistically significant. Risk factor (independent variable) Multivariable regression coefficient (95% CI) P-value Age at time of surgery -0.47 (-1,0;0.17) 0.15 Female -11.6 (-20.4; -2.7) 0.011 Previous procedures performed -16.2 (-27.1; -5.3) 0.004 Patellar height -11.6 (-29.2;6.1) 0.20 Trochlear dysplasia A or C vs. B or D 2.6 (-6.1;11.3) 0.55 Additional MPFL reconstruction 5.8 (-11.0;22.6) 0.49 Additional tibial tubercle transfer 0.94 (-6.3;8.2) 0.80 Table 3. Results of multivariable regression analysis for Kujala Knee Score as dependent variable. CI: confidence interval. Bold risk factor: statistically significant. Risk factor (independent variable) Multivariable regression coefficient (95% CI) P-value Age at time of surgery 0.79 (-0.23;1.8) 0.13 Female 21.0 (6.8;23.3) 0.004 Previous procedures performed 14.8 (-2.7;32.2) 0.096 Patellar height 9.9 (-18.5;38.3) 0.49 Trochlear dysplasia A or C vs. B or D -8.0 (-21.9;6.0) 0.26 Additional MPFL reconstruction 1.8 (-25.1;28.8) 0.89 Additional tibial tubercle transfer -4.4 (-16.0;7.4) 0.46 Table 4. Results of multivariable regression analysis for VAS pain activity as dependent variable. CI: confidence interval. Bold risk factor: statistically significant.