Table 3.

Minimum, maximum and mid-stance (± SD) moment arm values (mm) for hind limb muscles of the Quarter Horse and Arab for joint angles corresponding to those measured during the canter.

		Quarter Horse			Arab
Muscle	Joint	Min (± SD)	Max (± SD)	Mid-stance (± SD)	Min (± SD)	Max (± SD)	Mid-stance (± SD)
Gluteus medius L1	Hip	52 ± 11	52 ± 11	52 ± 11	41 ± 20	41 ± 20	41 ± 20
Gluteus medius L2	Hip	55 ± 14	55 ± 14	55 ± 14	36 ± 23	36 ± 23	36 ± 23
Gluteus medius L3	Hip	47 ± 19	47 ± 19	47 ± 19	40 ± 15	40 ± 15	40 ± 15
Gluteus medius L4	Hip	52 ± 20	52 ± 20	52 ± 20	42 ± 16	42 ± 16	42 ± 16
Gluteus medius L5	Hip	52 ± 26	52 ± 26	52 ± 26	38 ± 12	38 ± 12	38 ± 12
Biceps femoris	Hip	62 ± 7	62 ± 7	62 ± 7	44 ± 12	44 ± 12	44 ± 12
Semitendinosus	Hip	44 ± 5	49 ± 18	44 ± 5	17 ± 25	32 ± 31	19 ± 25
Biceps femoris (vertebral head)	Stifle	55 ± 18	66 ± 33	60 ± 23	39 ± 28	51 ± 45	44 ± 34
Biceps femoris (intermediate head)	Stifle	24 ± 22	53 ± 45	36 ± 31	22 ± 12	25 ± 35	23 ± 18
Biceps femoris (caudal head)	Stifle	126 ± 47	204 ± 170	159 ± 95	113 ± 50	171 ± 105	137 ± 71
Semitendinosus	Stifle	118 ± 36	118 ± 36	118 ± 36	92 ± 42	92 ± 42	92 ± 42
Vastus lateralis	Stifle	105 ± 64	202 ± 122	146 ± 77	89 ± 14	153 ± 19	115 ± 13
Gastrocnemius lateralis	Stifle	68 ± 10	68 ± 10	68 ± 10	51 ± 7	51 ± 7	51 ± 7
Gastrocnemius medialis	Stifle	25 ± 53	47 ± 20	46 ± 29	6 ± 40	21 ± 42	15 ± 40
Gastrocnemius	Tarsus	92 ± 7	92 ± 7	92 ± 8	86 ± 7	86 ± 7	86 ± 7
Tibialis cranialis	Tarsus	31 ± 5	31 ± 5	31 ± 6	33 ± 3	33 ± 3	33 ± 3