wrist
The horses stifle is directly behind the flank.
It's the equivalent to a human knee-joint - Without it, the horse wouldn't be able to walk properly !
It depends on wich part you are talking about. there are three. The feltlock, the pastern, and the ergot.
The stifle joint
There is a patella (kneecap) in the front of each knee, to support and protect the joint behind it.
The horse is built for speed, and its muscles are bunched at the top of its legs. The horse's knee is called the stifle and is only slightly below the 'body' level. The hock, less than halfway down the leg, corresponds to the human ankle. From the hock to the fetlock, the bones that correspond to those in the human foot are fused. The fetlock is the first toe joint - the horse stands on the tip of a single toe.
Animals that have no legs. This would include single celled animals, whales, dolphins, fish, snakes et cetera. Most mammals with legs have the equivalent to a knee (carpus) in the hind limb but comparitive anatomy would have the common names for the knee in a human are often called a stifle joint in dogs and horses. The joint called knee in the front leg of a horse is actually equivalent to a human wrist.
The joint right above the cannon bone is the knee. A horses knee should be large and shield shaped, small or round knees are more prone to injuries.
The joint between the horse's hock and hip is called the Stifle joint.
A horse's hock is located on the back legs of the horse. It is the joint that would act as a knee for the horse and is the large joint located about half way up the horse's leg. Additional information: in comparative anatomy the hock joint is equivalent to a human ankle so it bends backward instead of forward. The stifle joint in a horse actually the same as a human knee joint.
slider joint
Stifle (Stifle Joint) Underlying the stifle area is the stifle joint formed between the large hip bone (femur) which is equivalent to our thigh bone and the tibia, equivalent to our shin bone. The stifle joint somewhat resembles a human knee.