Facts

3 YO spayed female pomeranian, 11.6 pounds

Indoor dog

Owners have another dog; the two play well together

Fed 1 small can dinner / day

Lame in Right hind leg

Fell off bed one year ago with weight Ð bearing lameness on RR leg

Clinically normal one month post injury

6 months later started showing mild RR lameness

Rx: anti-inflammatory injection 7 months post Ð injury; drug unknown, did not help

Lameness has not progressed severely over last 6 months

Vaccinated regularly, and on heartworm preventative

Dewormed 2 months ago

Occassional ÒallergiesÓ, which causes seasonal sneezing

Rx: Benadryl PO when allergies act up; last administration 1 week ago

Grade 3/4 intermittent, non-weight bearing lameness on RR leg

Palpation of RR revealed that medial buttressing is possible on the stifle

Cranial drawer NEG

Patella easily luxated to medial side of trochlear groove with leg in extension

Patella returns to trochlear groove when stifle is in flexion

No abnormalities in hip joint, long bones, muscles, and other joints in leg

Palpation of LR leg revealed only pain (tried to bite) when cranial drawer and patella 
luxation attempted

Pain response elicited on dorsal flexion of tail

No pain on direct pressure to spine and lumbosacral joint