L
An impairment of the normal cycle of movement of one or several limbs. The cause of this impairment may be mechanical dysfunction, pain or paresis. Depending on the stage of the cycle in which the impairment is visible one differentiates between a supporting limb lameness, a swinging limb lameness and a mixed lameness.
M
S
A gait abnormality seen during the swing phase of a limb. The limb's protraction phase is shortened and disturbed due to mechanical or pain related factors.
F
The highest grade of lameness where a horse refuses to place any weight in one of its limbs. This is often the case if a bone is fractured, it may however be due to other reasons entirely.