stay apparatus, reciprocal apparatus

components of the hindlimb stay apparatus

superficial digital flexor, fibrous band in gastrocnemius, patellar ligaments, peroneus tertius, deep digital flexor, interosseous muscle, distal sesamoidean ligaments, extensor branches of interosseous

is there a proximal check ligament in the stay apparatus?

there is no proximal check ligament in the stay

stifle joint is

the key joint for supporting weight by the pelvic limb

when the stifle is locked in extension,

the hock must also be extended

the hock is extended by the

superficial digital flexor, gastrocnemius

by locking the stifle, the horse

effectively locks every joint to the stifle

2 ways of abnormal locking of the patella

malformed trochlear lip, excessively short medial patellar ligament

2 parts of the reciprocal apparatus

peroneus tertius, superficial digital flexor/gastrocnemius fascial bond

peroneus tertius forces

the hock to flex when the stifle is flexed

rupture of the peroneus tertius means

reciprocal apparatus no longer functions