Fracture Fixation and Implants

CASE REPORTS: Sacral fracture repair was accomplished in a cat and five dogs using a composite technique consisting of pins and polymethylmethacrylate (PMMA).

In three of the cases, planned traditional iliosacral lag screw fixation was either abandoned or considered inadequate and in the other three, fracture configuration demanded an alternate repair method. All six cases healed uneventfully with no surgery-associated complications.

OBJECTIVE: To evaluate the biomechanical properties of single 3.5 mm broad dynamic compression plate (DCP) and double 3.5 mm String-of-Pearls (SOP) plate constructs in single-cycle bending and torsion. We hypothesized that the double SOP construct would outperform the broad DCP in both bending and torsional testing.

METHODS: Broad DCP plates and double 3.5 mm SOP plates were secured to a previously validated bone model in an effort to simulate bridging osteosynthesis. Constructs were tested in both four-point bending and torsional testing.

OBJECTIVES: To investigate whether administration of postoperative oral antimicrobial drugs has a beneficial effect on preventing surgical site infections (SSI) in clean orthopedic surgery involving stainless steel plating systems.

STUDY DESIGN: Randomized prospective clinical study.

ANIMALS:Dogs (n = 97).

Two cats that developed bilateral calcaneal stress fractures are reported. One cat developed lameness associated with incomplete fractures at the base of both calcanei, both of which progressed to acute, complete fractures 2 months later. The second cat presented with acute complete calcaneal fracture, with evidence of remodelling of the contralateral calcaneus, which subsequently fractured two years later.

OBJECTIVES: To determine whether extending prophylactic antimicrobial administration into the postoperative period would decrease the surgical site infection (SSI) rate in clean canine orthopedic surgery associated with a metal implant.

STUDY DESIGN: Randomized prospective clinical study.

SAMPLE POPULATION: Consecutive procedures (n = 400) on dogs that had clean orthopedic surgery using a metal implant.

OBJECTIVE:  To describe a surgical technique using a regenerative approach and internal fixation for immediate reconstruction of critical size bone defects after segmental mandibulectomy in dogs.

STUDY DESIGN: Prospective case series.

ANIMALS: Dogs (n = 4) that had reconstruction after segmental mandibulectomy for treatment of malignant or benign tumors.

Circular external fixators are commonly used to surgically treat a variety of orthopedic conditions. However, distortion artifact may mislead the radiographic interpreter as to the true anatomic location of the transfixing wires and either negatively impact patient healing or lead to unnecessary procedures. Distortion is due to unequal magnification of different parts of an object. The purpose of this study was to assess distortion of three circular external fixator apparatuses with the transfixing wires at 30, 60, and 90°.

OBJECTIVE: To describe internal fixation for maxillofacial fractures using titanium miniplates and report outcome in 7 dogs.

STUDY DESIGN: Prospective case series.

ANIMALS: Skeletally mature dogs (n = 7) with maxillofacial fractures.

OBJECTIVES: The purpose of this study was to determine the accuracy of a commonly used veterinary wire tensioner.

OBJECTIVE: To evaluate the bending strength of the VetLOX® polyaxial locking plate system.

MATERIALS AND METHODS: Thirty-five 3.5 mm 12-hole titanium VetLOX® plates were used to stabilize seven different construct designs in a 1 cm fracture gap simulation model. Each construct was subjected to axial compression. Mean bending stiffness (BS) and yield load (YL) of each construct design were analysed using a one-way ANOVA and Tukey post-hoc analysis. Screw angulation was measured on reconstructed computed tomography (CT) images.