Patient reported outcome measures in anterior cruciate ligament rupture and reconstruction: The significance of outcome score prediction

Table 7 Multiple linear regression analysis of pre-operative knee outcome scores (n = 50)

Equation (R2, P value, σE)
KOOS
Tegner = 2.3 + (0.02 × Symp.) + (0.003 × Pain) - (0.01 × ADL) + (0.01 × Sp. & Rec.) + (0.01 × QOL)
(R2 = 0.17, P = 0.161, σE = 1.2)
Lysholm = 38.2 + (0.36 × Symp.) + (0.22 × Pain) - (0.14 × ADL) - (0.05 × Sp. & Rec.) + (0.20 × QOL)
(R2 = 0.55, P < 0.001, σE = 9.0)
Cincinnati = 27.0 + (0.02 × Symp.) + (0.36 × Pain) + (0.02 × ADL) + (0.05 × Sp. & Rec.) + (0.21 × QOL)
(R2 = 0.49, P < 0.001, σE = 10.9)
IKDC Subjective = 12.6 + (0.11 × Symp.) + (0.25 × Pain) - (0.002 × ADL) + (0.23 × Sp. & Rec.) + (0.14 × QOL)
(R2 = 0.68, P < 0.001, σE = 9.1)
KOS-ADLS = (0.29 × Symp.) + (0.01 × Pain) + (0.64 × ADL) + (0.05 × Sp. & Rec.) + (0.09 × QOL) – 6.4
(R2 = 0.74, P <0.001, σE = 10.3)
SF-12
Tegner = 0.6 + (0.07 × PCS) - (0.002 × MCS)
(R2 = 0.25, P = 0.002, σE = 1.1)
Lysholm = 30.6 + (0.61 × PCS) + (0.33 × MCS)
(R2 = 0.30, P = 0.002, σE = 10.7)
Cincinnati = 14.4 + (0.83 × PCS) + (0.33 × MCS)
(R2 = 0.36, P < 0.001, σE = 11.7)
IKDC Subjective = (1.18 × PCS) + (0.32 × MCS) - 12.2
(R2 = 0.46, P < 0.001, σE = 12.7)
KOS-ADLS = (1.29 × PCS) + (0.65 × MCS) - 12.8
(R2 = 0.59, P < 0.001, σE = 12.2)

R²: Regression coefficient; σ_E: Root mean squared error. IKDC: International Knee Documentation Committee; Sub: Subjective knee score; KOS-ADLS: Knee Outcome Survey - Activities of Daily Living Scale; SF-12: Short Form - 12 Item Health Survey; PCS: Physical component summary; MCS: Mental component scores; KOOS: Knee Injury and Osteoarthritis Outcome Score; ADL: Activities of daily living; QOL: Quality of life.