Objective—To compare radiographic and arthroscopic
abnormalities in juvenile dogs with clinically apparent
Animals—52 dogs (70 hip joints) with clinical signs of hip
dysplasia scheduled to undergo triple pelvic osteotomy.
Procedure—A ventrodorsal radiographic projection of
the pelvis was evaluated by a radiologist unaware of
clinical and arthroscopic findings, and radiographic
osteoarthritic abnormalities were judged and scored
as absent (0), mild (1), moderate (2), or severe (3).
Arthroscopy was performed by a surgeon unaware of
clinical and radiographic findings, and arthroscopic
abnormalities were graded from 0 (normal) to 5
(exposed, eburnated subchondral bone).
Results—In 30 of the 70 (43%) hip joints, no radiographic
osteoarthritic abnormalities were seen.
Severe, full-thickness articular cartilage lesions
(grade 4) of the femoral head or acetabulum were
seen arthroscopically in 14 (20%) joints. Lesions ≥
grade 2 were seen in 60 (86%) joints. Partial tearing
of the ligament of the femoral head was present
in 57 (81%) joints, and complete rupture was
seen in 5 (7%). Radiographic abnormalities were
seen in 13 of the 14 (93%; 95% confidence interval,
66% to 99.8%) joints with grade 4 arthroscopic
abnormalities but in only 23 of the 46 (50%; 95%
confidence interval, 35% to 65%) joints with grade
2 or 3 arthroscopic abnormalities.
Conclusions and Clinical Relevance—Results suggest
that radiography is not a sensitive method for identifying
moderate cartilage lesions in juvenile dogs with hip dysplasia.
If moderate cartilage lesions are an important
prognostic indicator for the success of triple pelvic
osteotomy, then methods other than radiography should
be used to detect these lesions. (J Am Vet Med Assoc 2005;227:1091–1094)
Objective—To determine prevalence of the contralateral radiographic infrapatellar fat pad sign and contralateral radiographic degenerative sign (degenerative changes) and evaluate both signs as risk factors for subsequent contralateral cranial cruciate ligament (CrCL) rupture in dogs with unilateral CrCL rupture.
Design—Retrospective cohort study.
Animals—96 dogs with unilateral CrCL rupture and 22 dogs with bilateral CrCL rupture.
Procedures—Dogs with unilateral CrCL rupture were classified as having normal (n = 84) or abnormal (12) contralateral stifle joints on the basis of joint palpation. Associations between potential predictive variables and rates of subsequent contralateral CrCL rupture were evaluated.
Results—Of the 84 dogs with unilateral CrCL rupture in which the contralateral stifle joint was palpably normal, 29 (34.5%) had a contralateral fat pad sign and 31 (36.9%) had a degenerative sign. All dogs with unilateral CrCL rupture in which the contralateral stifle joint was palpably abnormal had a contralateral fat pad sign and degenerative sign. The contralateral fat pad sign was the most important risk factor for subsequent rupture of the contralateral CrCL. For dogs with unilateral CrCL rupture and palpably normal contralateral stifle joint with and without a contralateral fat pad sign, median time to subsequent rupture was 421 and 1,688 days, respectively, and the 3-year probability of subsequent rupture was 85.3% and 24.9%, respectively.
Conclusions and Clinical Relevance—Bilateral stifle joint radiography should be performed for all dogs with CrCL rupture. Bilateral stifle joint arthroscopy should be considered for dogs with a contralateral fat pad sign.