Positioning Sternal recumbency with leg to be radiographed extended caudally Use sandbags or wedges to raise the unaffected limb Position so the patella is in the midline Centre on the midline of the stifle Collimate to show distal 1/3rd femur and proximal 1/3rd of tibia/fibula Ensure L/R marker in primary beam What to look for Good visualisation of the joint space Femoral condyles should be of equal size, with the patella in the midline Top tips If the limb keeps rotating put cotton wool under the joint to help prevent it slipping Use tape to ensure the tail is not over the region of interest
