Owner Evaluation of a CORA-Based Leveling Osteotomy for Treatment of Cranial Cruciate Ligament Injury in Dogs

Vet Surg. 2016 May;45(4):507-14. doi: 10.1111/vsu.12472. Epub 2016 Apr 4.


Objective: To evaluate a center of rotation of angulation (CORA)-based leveling osteotomy for cranial cruciate ligament injury in dogs.

Study design: Retrospective case series.

Animals: Dogs (n=70).

Methods: Medical records (March 2011 to March 2012) of dogs diagnosed with a cranial cruciate ligament (CCL) injury treated with a CORA-based leveling osteotomy and stabilized using a bone plate and headless compression screw were reviewed. Radiographs were reviewed for tibial plateau angle and radiographic healing at final evaluation graded on a 5-point scale. Follow-up for a minimum of 6 months postoperatively was conducted by owner completion of a questionnaire regarding their dog's function after surgery. Based on owner responses, clinical outcomes were established.

Results: CORA-based leveling osteotomy was used for 70 stifles with CCL injury. The mean time to final radiographic recheck was 107 days (range, 32-424 days). Radiographic healing scores were 42 dogs (69%) with grade 4, 17 dogs (28%) with grade 3, and 2 dogs (3%) with grade 2. The mean time to follow-up was 11.9 months (range 6-18 months). Fifty-four of the 70 (77%) dogs had full function, 13 (19%) had acceptable function, and 3 (4%) had unacceptable function. Complications occurred in 11 stifles (16%), including 3 incisional, 6 late-onset meniscal tears, and 2 implant related.

Conclusion: The described method of a CORA-based leveling osteotomy can be successfully performed for treatment of CCL injury in dogs. At the time of mid-term and long-term owner follow-up, most dogs in this case series had returned to full function.

Publication types

  • Evaluation Study

MeSH terms

  • Animals
  • Anterior Cruciate Ligament / surgery
  • Anterior Cruciate Ligament Injuries / diagnostic imaging
  • Anterior Cruciate Ligament Injuries / surgery
  • Anterior Cruciate Ligament Injuries / veterinary*
  • Bone Plates / veterinary
  • Bone Screws / veterinary
  • Dogs / injuries*
  • Dogs / surgery
  • Female
  • Humans
  • Male
  • Osteotomy / veterinary
  • Postoperative Complications / veterinary
  • Retrospective Studies
  • Stifle / surgery
  • Tibia / surgery*
  • Wound Healing