Accessory Carpal Pad Cat. Distal to this groove, insert the needle subcutaneously with the bevel up and advance the needle proximally. The accessory carpal pad is a good starting point;
The flexor retinaculum is the carpal fascia on the palmar aspect, and lies between the accessory carpal bone and the medial aspect of the carpus. O locate the carpus and accessory carpal pad. Collimate so the fov is centered in the middle of the metacarpal bones and includes the digits (toe nails included), proximal to the level of the antebrachiocarpal joint.
To set collimation for the mediolateral image:
Insert the needle subcutaneously with the bevel up lateral to the distal tip of the accessory carpal pad and advance the needle medially 2/3 the width of the limb, until the tip is located near the base of the first digit. Proximally, (mediolaterally), radial, intermediate, ulnar and accessory bones. (a) the claw, (b) digital pads , (c) metacarpal (on the front paws) and metatarsal (on the rear paws) pad, (d) dew claw, (e) carpal pad. My dog has a scrap on her carpal pad.