Table 1.

Forelimb Locomotor Scale (FLS) Scoring Rubric

FLS score	Behavioral description
0	No movements of the forelimb (shoulder, elbow, or wrist joints)
1	Slight movements of one or two joints of the forelimb
2	Extensive movement of one joint and slight movement of another joint of the forelimb
3	Slight movement of all three joints of the forelimb
4	Extensive movement of one joint and slight movement of two joints of the forelimb
5	Extensive movement of two joints and slight movement of one joint of the forelimb
6	Extensive movement of all three joints of the forelimb
7	Plantar placement of the forelimb with no weight support
8	Dorsal stepping only
9	Dorsal stepping and/or occasional plantar stepping
10	Frequent plantar stepping
11	Continuous plantar stepping
12	Continuous plantar stepping with paw position rotated (either at initial contact, lift-off, or both)
13	Continuous plantar stepping with paw position parallel (either at initial contact, lift-off, or both)
14	Continuous plantar stepping with paw position rotated (either at initial contact, lift-off, or both) and occasional toe clearance
15	Continuous plantar stepping with paw position parallel (either at initial contact, lift-off, or both) and occasional toe clearance
16	Continuous plantar stepping with paw position rotated (either at initial contact, lift-off, or both) and continuous toe clearance
17	Continuous plantar stepping with paw position parallel (either at initial contact, lift-off, or both) and continuous toe clearance

Numerical score values are given based on defined behavioral criteria. (Adapted from Sandrow et al.³¹).