EXPRESS: Concurrent Caudal Cruciate and Medial Collateral Ligament Repair using a Single Mini TightRope™ (Arthrex) Fixation in a Cat

Case Summary A two year-old female spayed domestic shorthaired cat presented with acute left pelvic limb lameness following suspected trauma. Orthopaedic and radiographic findings were consistent with a medial collateral and caudal cruciate ligament rupture. Surgical exploration identified complete rupture of the caudal cruciate and medial collateral ligament, as well as a crushed medial meniscus, necessitating partial medial meniscectomy. Primary repair of the medial collateral ligament was performed and stifle stability was achieved using a Mini TightRope™ (Arthrex) prosthesis, placed in a position to concurrently aid stifle stability from rupture of both ligaments. At eight weeks postoperatively, the cat demonstrated normal gait and pain-free stifle manipulation, with radiographs confirming implant stability and no complications. No lameness was reported by the owner two years postoperatively. Relevance and Novel Information This is the first case the authors are aware of that reports the use and outcome of a cat undergoing stifle stabilisation using bone tunnels and a Mini TightRope™ to address complete medial collateral and caudal cruciate ligament rupture. This novel technique allowed for stabilisation without the need for external coaptation, enabling early return to function.