Table 2.

Features chosen by Wrapper for the classification task.

RF	GB
Base of support (cm)	Base of support (cm)	Stop Healthy VM
BMD of the Proximal region of femur	Toe In Out Operated (angle)	Start Healthy RFe
SD of the BMD of the Proximal region of femur	Velocity (m/s)	Stop Healthy RFe
VM Operated HU	Healthy leg BMD	Start Healthy VL
VM Healthy HU	RFe Operated HU	Stop Healthy VL
Stop Healthy VM	RFe Operated Dev. Std.	Start Operated VM
Stop Healthy RFe	RFe Healthy Dev. Std.	Stop Operated VM
Start Healthy VL	VL Operated HU	Start Operated RFe
Start Operated VL	VL Healthy HU	Stop Operated RFe
	VM Operated HU	Start Operated VL
	Start Healthy VM	Stop Operated VL

VM = Vastus Medialis, RFe = Rectus Femoris, VL = Vastus Lateralis, HU = Hounsfield Unit.