Table 2.

Rotated factor loadings of the original QST data using Principal Components Analysis with Oblimin Rotation; four components explain 75.5% of the variance in the QST data.

QST	Heat Sensitivity	Punctate Sensitivity	Temporal Summation	Pressure Sensitivity
Heat Pain Threshold – Surg Knee	.775	.092	−.006	.074
Heat Pain Threshold – Surg Tibia	.847	−.011	.042	−.101
Heat Pain Threshold – Cont Knee	.764	.034	.071	.148
Heat Pain Threshold – Cont Tibia	.812	−0.58	.020	−.031
Heat Pain Tolerance – Surg Knee	.804	.062	−.024	.070
Heat Pain Tolerance – Surg Tibia	.848	−.073	−.042	−.034
Heat Pain Tolerance – Cont Knee	.797	.011	−.052	.080
Heat Pain Tolerance – Cont Tibia	.884	−.015	−.049	−.046
Von Frey pain – Surg Knee	.000	.878	.062	−.078
Von Frey pain – Surg Tibia	.021	.924	.063	−.027
Von Frey pain – Cont Knee	.059	.878	−.001	−.043
Von Frey pain – Cont Tibia	−.067	.812	−.128	.091
Heat Temporal Summation – Surg Knee	.098	−.085	−.900	−.021
Heat Temporal Summation – Surg Tibia	.041	.023	−.922	.021
Heat Temporal Summation – Cont Knee	−.103	.066	−.879	−.030
Pressure Pain Threshold – Surg Knee	.089	−.014	.054	.780
Pressure Pain Threshold – Surg Tibia	−.043	−.024	.025	.945
Pressure Pain Threshold – Cont Knee	.017	−.015	−.020	.883
Pressure Pain Threshold – Cont Tibia	−.002	.000	−.023	.927

Note: Original factor loadings are provided, prior to reverse scoring factors 1, 3, and 4 to make higher values represent greater sensitivity. Absolute factor loadings ≥ 0.30 are in bold.

Abbreviations: QST=Quantitative Sensory Testing; Surg=surgical; Contr=contralateral.