DePuy Synthes Vet offers guidance for all stages of the TPLO surgery process.
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Cranial drawer sign: With complete ligament rupture, the tibia can move
forward (with respect to the femur). With partial rupture, less movement
is possible but a small amount of looseness is often detectable.

Cranial tibial thrust: While a dog is walking, the femur slides back, and
the tibia moves forward, because of a sloped tibial plateau

Femur: Thigh bone

Patella: Knee cap

Stifle: Knee joint

Tibia: Shin bone

Technical contributions from Dr. Michael Kowaleski 
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