Titanium-Alloy Anchoring System as a Suitable Method of Extracapsular Repair

Area of Science:

• Veterinary Orthopedics
• Biomechanical Engineering

Background:

• Cranial cruciate ligament (CrCL) rupture is a common cause of stifle joint instability in dogs.
• Current treatments aim to restore stifle stability, but outcomes can vary.

Purpose of the Study:

• To evaluate the biomechanical effects of a novel titanium-alloy anchoring system (TAS) on stifle joint motion.
• To compare stifle motion in CrCL-deficient dogs with and without the TAS to that of CrCL-intact dogs.

Main Methods:

• Canine pelvic limbs were tested in a loading jig at 30% body weight.
• An electromagnetic tracking system recorded stifle motion at 125°, 135°, and 145°.
• Motion was assessed in intact, CrCL-deficient, and TAS-implanted CrCL-deficient stifles.

Main Results:

• The TAS reduced overall tibial translation in CrCL-deficient stifles compared to untreated deficient stifles, but translation remained higher than in intact stifles.
• Internal rotation was greater in the TAS group than the intact group at 145°.
• Varus motion decreased with the TAS compared to the deficient state but was still greater than in intact stifles.

Conclusions:

• The TAS alters stifle motion in CrCL-deficient dogs, differing from intact stifles.
• The system significantly reduced tibial translation and internal rotation, potentially leading to clinically acceptable outcomes for stifle joint stability.