Objective—To determine the prevalence of cranial cruciate
ligament rupture (CCLR) in dogs with lameness
previously attributed to canine hip dysplasia (CHD).
Animals—369 client-owned dogs.
Procedures—Hospital medical records from 1994 to
2003 were reviewed for dogs in which the referring
veterinarian had diagnosed hip dysplasia or hip pain.
Dogs were designated as having hind limb lameness
because of partial or complete CCLR or CHD.
Results—8% of dogs were sexually intact females,
43% were spayed females, 14% were sexually intact
males, and 35% were castrated males. Mean age was
3.8 years (range, 3 months to 15 years). The most common
breeds were the Labrador Retriever (21%), German
Shepherd Dog (13%), and Golden Retriever (11%). The
prevalence of CCLR as the cause of hind limb lameness
was 32% (95% confidence interval, 27.2% to 36.8%).
The distribution of CCLR among hind limbs was left
(29%), right (28%), and bilateral (43%). Of 119 dogs with
CCLR, 94% had concurrent radiographic signs of CHD,
92% had stifle joint effusion, and 81% had a cranial
Conclusions and Clinical Relevance—On the basis of
the high prevalence of CCLR in dogs referred for lameness
because of CHD, it is important to exclude other
sources of stifle joint disease before making recommendations
for treatment of CHD. (J Am Vet Med Assoc 2005;227:1109–1111)