A horse's leg is a study in efficiency, and that efficiency comes with a real weak point. The detail that explains almost everything else is this, there are no muscles below the knee and hock. The lower leg is bone, tendon, ligament, and cartilage, which keeps it light and fast but leaves the tendons carrying enormous force on every stride.
That design made the horse a runner, able to flee a predator on long, light legs. For us, it means the lower limb is both impressive and fragile, and it's where most working injuries happen. Knowing the parts is the first step to protecting the ones that matter.
Horse leg bones from top to bottom
The foreleg starts at the shoulder blade, the scapula, which connects to the upper arm bone, the humerus. From there the radius and ulna run down to the knee, which is really a stack of small carpal bones rather than a single joint. Below the knee sits the cannon bone, with the slim splint bones tucked alongside it.
At the back of the fetlock you'll find two small sesamoid bones that work like pulleys for the tendons. Below the fetlock come the long and short pastern bones, then the coffin bone inside the hoof, with the small navicular bone behind it. The hind leg repeats this lower pattern but starts with the pelvis, femur, stifle, and tibia, then the hock, which works much like a human ankle and absorbs huge propulsive force.
The joints that absorb shock
The fetlock, pastern, coffin, knee, hock, and stifle all flex and extend to soak up concussion as the horse moves. The fetlock in particular drops toward the ground under load, which is part of how the limb stores and returns energy with each step. That spring is brilliant for movement and hard on the structures that allow it.
Horse leg tendons and ligaments, the soft tissue that does the work
Since the muscles sit above the knee and hock, long tendons reach down the leg to move the lower joints. These tendons and the ligaments beside them are the structures that strain and tear under hard work. They're also the ones protective boots are designed to shield, which is why learning them pays off.
Superficial and deep digital flexor tendons
These two tendons run down the back of the cannon and flex the lower joints while supporting the horse's weight. They take the brunt of the loading-and-recoil cycle every stride, so they're among the most commonly injured tissues in the horse. Heat or swelling along the back of the cannon is always worth a closer look.
Suspensory ligament
The suspensory ligament holds the fetlock in position and stops it dropping too far when the horse is in motion. It's central to that energy-storing spring in the fetlock, which also makes it a frequent site of strain in performance horses. Damage here can be slow to show and slow to heal, so early attention counts.
Check ligaments
The check ligaments connect into the flexor tendons and limit how much strain those tendons take. They're a quiet part of the support system that rarely gets attention until something goes wrong. Their job is to keep the tendons from overloading during hard work.
Extensor tendons
Running down the front of the leg, the extensor tendons lift the toe and help the horse place the foot. They carry less load than the flexors but still play a part in clean, balanced movement. Together with the flexors they keep the lower leg working as one coordinated unit.
Those flexor tendons and the fetlock take the load on every stride. Guard them with Grewal Equestrian tendon and fetlock boots, and stop overreach strikes with bell boots.
Why this anatomy shapes daily care
Once you know what sits under the skin, daily leg checks stop feeling like a chore and start feeling like insurance. Run your hands down each leg after work and learn what normal feels like, so heat, swelling, or tenderness stands out the day it appears. Cooling the legs after hard sessions and choosing the right protection for the job both help these tissues last.
Boots earn their place precisely because the tendons they cover have so little margin. Tendon boots support and protect the back of the cannon, fetlock boots guard the inside of the joint from brushing, and bell boots stop a hind foot catching a front heel. Matching the boot to the work is how you turn this anatomy lesson into fewer injuries.
Want the detail on each type of protection? Read our guides to tendon boots and fetlock boots, then shop the full boot range.
Protect and outfit your horse with Grewal
Knowing how the leg works is the first step, and protecting it is the next. Grewal Equestrian carries the boots that guard those tendons plus the bridles, reins, breeches, and grooming tools that round out a working horse's kit. For everything from leg protection to show-day apparel, explore the full Grewal Equestrian range and shop it all together.
Horse leg questions owners ask most
What bones make up a horse's leg?
The foreleg runs from the shoulder blade and upper arm down through the radius to the knee, then the cannon bone, the pastern bones, and the coffin and navicular bones inside the hoof. The hind leg follows the same lower pattern but begins at the pelvis, femur, and tibia, with the hock in place of the knee. The small splint and sesamoid bones sit alongside the cannon and fetlock to support the joint and the tendons.
Why are there no muscles below a horse's knee?
The lower leg is built from bone, tendon, and ligament rather than muscle, which keeps it light at the end of the limb and lets the horse move its legs quickly. The muscles that drive the lower joints sit higher up and pull on long tendons that reach down the leg. That design makes the horse a fast, efficient mover, but it leaves those tendons carrying heavy loads.
What is the fetlock on a horse?
The fetlock is the joint between the cannon bone and the pastern, sitting just above the hoof where the leg appears to have a backward-facing knuckle. It drops toward the ground under the horse's weight and springs back, which is part of how the leg stores and returns energy. Because it takes so much load, it's one of the areas riders most often protect with boots.
Which part of a horse's leg gets injured most?
The flexor tendons running down the back of the cannon and the suspensory ligament are the structures most prone to strain, since they absorb the loading and recoil of every stride. Heat, swelling, or tenderness along the back of the cannon is an early warning worth checking. Catching it early gives these slow-healing tissues the best chance.
