Contralateral bone widening and transfer for limb sparing in a cat

Area of Science:

• Veterinary Orthopedics
• Regenerative Medicine
• Surgical Innovation

Background:

• Long segmental bone defects pose significant challenges in veterinary surgery.
• Autografts are ideal for bone reconstruction but obtaining sufficient graft material can be difficult.
• Distraction osteogenesis offers a method for bone regeneration, but traditional methods have limitations.

Observation:

• A novel technique utilizing transverse distraction osteogenesis in the contralateral tibia was employed to generate a free autograft for a tibial defect.
• A circular external fixator facilitated 7 mm of cranial distraction over 42 days.
• The harvested bone segment was then transferred to the defect site and stabilized with locking plates.

Findings:

• Excellent healing of both tibias was achieved by 27 months post-surgery.
• All implants were removed, and limb function was excellent, with limb length at 90% of the contralateral side.
• Transverse distraction osteogenesis required a shorter distraction distance and time compared to longitudinal methods, reducing soft tissue damage risk.

Implications:

• This technique offers a promising alternative for treating long bone defects, potentially leading to better bone regeneration and incorporation.
• While effective, the procedure involves increased morbidity and risks associated with operating on a healthy limb.
• Further research could explore optimizing this method for broader application in veterinary orthopedics.