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Veterinary Research

American College of Veterinary Surgeons (ACVS) Surgery Summit (2022)

Evaluation of Novel Compression Screw


Headless compression screws with UnifiMI were evaluated biomechanically in frontal plane slab fractures of the radial facet in third carpal bone fractures of racehorses. UnifiMI headless compression screws compared favorably to standard 3.5mm AO cortical screws and eliminated the need to countersink which may decrease the odds of fragmentation and soft tissue irritation.

Salinger A., Mochal-King C., Priddy L, Clinton K, Wills R, & Jaffe M.

Mississippi State Vet Med

American College of Veterinary Surgeons (ACVS) Surgery Summit (2022)

Ex Vivo Bio-Mechanical Evaluation of a Novel Screw for Tibial Plateau Leveling Osteotomy


Convention 3.5mm screws for canine tibial leveling plateau osteotomy (TPLO) that utilize buttress threads with locking heads were compared biomechanically to 3.5mm non-locking UnifiMI fasteners in a cadaveric TPLO model. Stabilization of the TPLO plate with non-locking UnifiMI fasteners provided similar stability to standard locking screws under cyclic axial loading conditions.

Kettleman W, Jaffe M, Wills R, Dietz S, Elder S.

UC Davis - Conference Presentation

American College of Veterinary Surgeons (ACVS) Surgery Summit, E-Resident’s Forum, 2020

Biomechanical Comparison of an Interlocking Thread Screw and a Buttress Thread Screw for Fixation of a Simulated Slab Fracture in Cadaveric Adult Equine Third Carpal Bone
Biomechanical Comparison of a Biaxial Thread Screw and a Uniaxial Thread Screw for Fixation of a Simulated Slab Fracture in Cadaveric Adult Equine Third Carpal Bone


Screw insertion variables and shear strength were studied in simulated audult equine third carpal slab fractures.  Buttress screws and UnifiMI fasteners were compared in static shear loading. Constructs with UnifiMI fasteners showed median peak torque and max torque values three times higher than constructs with standard buttress screws. Fractures repaired with UnifiMI fastners showed a 30% increase in yield strength and showed 33% more displacement prior to failure.

Pye J, Garcia T, Kapatkin A, Stover S.

Veterinary Orthopedic Society (VOS) Conference, Sun Valley, ID, 2020

In Vitro Biomechanical Comparison of Drilling, Screw Insertion and Pullout Strength Variables of Interlocking and Buttress Thread Self-Tapping 3.5 mm Cortical Bone Screws in Cadaveric Equine Third Metacarpal Condyle


Drilling, screw insertion, and pullout properties were compared between standard 3.5mm buttress screws and 3.5mm UnifiMI fasteners.  Matched pair equine third metacarpal bones were used to measure drill torque, force, displacement, and bone surface temperature between standard orthopedic drill bits and Osteoguard drill bits.  Screw/fastener insertion torque, and screw/fastener pullout force were compared between buttress and UnifiMI implants.  Max axial force,  torque, and bone temperature changes were lower for Osteoguard drill bits.  Peak torques for UnifiMI were higher than standard screws, potentially indicating better bone engagement.  There were no significant differences in axial pull-out measures.

Pye J, Garcia T, Kapatkin A, Stover S.

American College of Veterinary Surgeons (ACVS) Surgery Summit

E-Resident’s Forum, 2020

Interlocking Thread Screws Enhance Repair Strength in Simulated Adult Canine Humeral Condylar Fractures


UnifiMI Fasteners, Buttress Lag Screws, and Locking Buttress Screws were compared bio-mechanically in simulated canine humeral condylar fractures. Insertion torque measurements were the highest for the UnifiMI Fasteners, and mean load to failure for UnifiMI constructs were higher than Locking Buttress Screws. Mean residual condylar fragment rotation was less for the UnifiMI constructs than the Buttress constructs, indicating greater rotational stability of the fragment.

Raleigh JS, Filliquist B, Kapatkin AS, et al.

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