Radiology Package 23

OCD

16-month old Labrador Retriever “Nipper” • Hx: 2 week history of lameness in the left hind. The tarsus is swollen and there is crepitation and pain on palpation of the joint.

16-month old Labrador Retriever “Nipper” • RF – The right tarsus is normal and is provided for comparison.

– In the left stifle there is evidence of capsular distension of the tibiotarsal joint.

– There is widening of the medial aspect of the tibiotarsal joint and the medial trochlear ridge appears shorter than that in the right tarsus.

– In the lateral view careful evaluation shows subtle flattening of mid-to plantar surface of one of the trochlear ridges.

– The articular surface of the distal tibia is subtly flattened, an indication of early osteoarthritis.

• RD – Osteochondrosis of the medial trochlear ridge of the talus

14-month old Old English Sheepdog

• Hx: Presented with left forelimb lameness of one-month’s duration. Initially the dog was lam after rest but now the lameness is almost constant. The lameness is worse after exercise. PE reveals pain when the left shoulder is manipulated.

14-month old Old English Sheepdog

• RF – There is an irregular radiolucent defect in the subchondral bone on the caudal aspect of the left humeral head.

– Faint sclerosis is preset surrounding the defect.

– Immediately adjacent to the defect is a thin, linear radiopacity within the joint space.

– The articular margins of the caudal aspect of the humeral head and glenoid cavity of the scapula are irregular.

– The right shoulder has a radiolucent defect in the subchondral bone on the caudal aspect of the humeral head.

• RD – Bilateral osteochondritis dissecans of the shoulders – Cartilaginous flap is visible in the left shoulder

10-month old Kuvasz “Mariuska”

• Hx: Bilateral forelimb lameness and shoulder pain.

10-month old Kuvasz “Mariuska”

• RF – Flattening of the subchondral bone of the caudal surface of both humeral head is present. • RD – Osteochondrosis of both humeral heads

7-month old Newfoundland

• Hx: Presented for evaluation of an OCD lesion in the right shoulder. On PE it is noted that there is mild joint effusion in both stifles.

7-month old Newfoundland

• RF – The infrapatellar fat pad is displaced cranially and decreased in size.

– Increase in size of the joint capsule has caused displacement of the fascial plane of the gastrocnemius muscle.

– In the lateral biew there is an ill-defined area of lucency in one of the femoral condyles. The lucent area is dome-shaped with the base of the dome at the articular surface of the bone.

– In the CC view the area of lucency is visible in the lateral femoral condyle. In this view it appears round and is surrounded by a rim of sclerotic bone.

• RD – Capsular distension (joint effusion and/or synovial thickening) – Osteochondrosis of the lateral femoral condyle • Subchondral bone cyst

4-month old German Shepherd

• Hx: Lame in the left hind limb for 4 days.

4-month old German Shepherd

• RF – There is evidence of moderate capsular distension.

– In the lateral view there is irregular and fimbriated pattern of mineralization in the femoral condyles. This gives a flattened appearance to the condyles.

– In the CC view this change in appearance of the condyles is difficult to appreciate but is present in the lateral femoral condyle.

• RD – Mineralization of the femoral condyles

11-month old MN German Shepherd “Cisco” • Hx: Intermittent lameness of right forelimb. Resists palpation of elbow.

11-month old MN German Shepherd “Cisco” • RF – In the right elbow there is a defect in the medial humeral condyle.

– In the left elbow a faint area of lucency is present in the medial humeral condyle.

– Careful inspection of the left elbow reveals the presence of a tiny linear mineral opacity structure in the lucent area. This is the cartilage flap that has elevated from the bone and undergone mineralization.

• RD – Bilateral OCD of the medial humeral condyle

1-year old Rottweiler “Ruko”

• Hx: Left hind limb lameness. Mild swelling of the tarsus is present.

1-year old Rottweiler “Ruko”

• RF – There is mild soft tissue swelling surrounding the tarsus.

– The subchondral bone of the medial ridge of the talus is abnormal.

– The DP view of the right tarsus is normal.

• RD – Osteochondrosis of the medial ridge of the left talus