Internal Fixation

Authors: Janik C. Gasiorowski VMD, Dean W. Richardson DVM, Diplomate ACVS, Raymond C. Boston MS, PhD, Thomas P. Schaer VMD
Journal: Veterinary Surgery

Objective
To determine changes in drill bit performance attributable to application of a triaxially resilient, hard-carbon thin film.
Study Design
In vitro mechanical study.
Methods

Authors: M. D. Klopfenstein Bregger, M. A. Jackson, M. Kummer, P. R. Kircher, J. A. Auer, A. E. Fürst
Journal: Equine Veterinary Education

A closed mid-diaphyseal fracture in a one-day-old foal was treated using a 3.5 mm locking compression plate on the cranial aspect of the radius. The foal showed good fracture healing, but a radio-ulnar synostosis developed despite the absence of transfixation by any implant into the ulna. Four months after surgery the radiographs revealed a cubital subluxation, which was managed by an osteotomy of the ulna at the time of plate removal, allowing the ulna to adjust into a normal position.

Authors: M. D. Klopfenstein Bregger, M. A. Jackson, M. Kummer, P. R. Kircher, J. A. Auer, A. E. Fürst
Journal: Equine Veterinary Education

A closed mid-diaphyseal fracture in a one-day-old foal was treated using a 3.5 mm locking compression plate on the cranial aspect of the radius. The foal showed good fracture healing, but a radio-ulnar synostosis developed despite the absence of transfixation by any implant into the ulna. Four months after surgery the radiographs revealed a cubital subluxation, which was managed by an osteotomy of the ulna at the time of plate removal, allowing the ulna to adjust into a normal position.

Authors: C. Whitfield-Cargile, J. P. Watkins
Journal: Equine Veterinary Education

A 9-day-old American Miniature horse was referred for evaluation and treatment of congenital bilateral carpal deformities. Clinical examination revealed a combination of flexural, angular and rotational deformities affecting both carpi. Radiographic evaluation of both forelimbs revealed malformation of the distal radial epiphysis accompanied by flexural contracture and external rotation of the limb distal to the antebrachial carpal joint. Conservative therapy was attempted with splints and bandages and failed to result in improvement.

Authors: Jacques Bellon, DR VET; Pierre-Yves Mulon, Dr VeT, DACVs
Journal: Journal of the American Veterinary Medical Association

Objective—To describe the use of a novel intramedullary interlocking nail for femoral fracture repair in newborn calves and outcome associated with this treatment modality.

Design—Retrospective case series.

Animals—25 calves.

Procedures—Medical records from calves referred for femoral fracture repair between November 2008 and June 2009 were included. Signalment, clinical findings, and results of lameness examination and complete radiographic examination were recorded. Details of surgical technique, orthopedic fixation, associated complications, and outcome were also noted.

Authors: Luca Panizzi DrMedVet, MVetSc, Diplomate ACVS, Spencer M. Barber DVM, Diplomate ACVS, Hayley M. Lang DVM, Andrew L. Allen BA, DVM, MVetSc, PhD et al.
Journal: Veterinary Surgery

Study Design: Experimental study.

Animals: Healthy horses (n=6).

Methods: A 5.5 mm, 3-drill tract arthrodesis technique was evaluated in 1 randomly selected CMC joint in each of 6 normal horses. Peak vertical ground reaction force (GRF) values were recorded before surgery and at 6, 8, and 12 months thereafter. Radiographic and clinical lameness scores were assigned at regular intervals until 12 months after surgery when the horses were euthanatized. Gross and histologic examinations were performed on the treated CMC joints.

Authors: Ryan R.E. Wolker DVM, MVetSc, Diplomate ACVS, David G. Wilson DVM, Diplomate ACVS, Andrew L. Allen DVM, MVetSc, PhD, James L. Carmalt MA, VetMB, MVetSc, Diplomate ABVP & ACVS
Journal: Veterinary Surgery

Objective: To determine whether intra-articular 70% ethyl alcohol alone (IAEA) or in combination with 2 percutaneously placed transarticular lag screws (EA-TLS) would result in arthrodesis of the equine proximal interphalangeal (PIP) joint.

Study Design: Experimental.

Animals: Healthy horses (n=6), aged 1.5–3 years, free of lameness, diagonally paired front and hind PIP joints.

Authors: Timm Gudehus Dr med vet, Gary A. Sod DVM, PhD, Laura M. Riggs DVM, PhD, Diplomate ACVS, Colin F. Mitchell BVMS, MS, Diplomate ACVS, George S. Martin DVM, MS, MBA, Diplomate ACVS
Journal: Veterinary Surgery

Objectives: To compare the mean number of cycles to failure under axial compression of equine proximal interphalangeal (PIP) joint arthrodesis constructs created by 2 parallel transarticular Acutrak Plus screws (AP-TS) or 2 parallel transarticular 5.5 mm cortical screws inserted in lag fashion (AO-TLS).

Study Design: Paired in vitro biomechanical testing of 2 methods of stabilizing cadaveric adult equine forelimb PIP joints.

Sample Population: Cadaveric adult equine forelimbs (n=5 pairs).

Authors: I. M. WRIGHT, M. R. W. SMITH
Journal: Equine Veterinary Journal

Reasons for performing the study: Removal of large chip fractures of the carpal bones and the osteochondral deficits that result, have been associated with a worse prognosis than removal of small fragments in similar locations.

Hypothesis: Reducing the articular defects by repair of large osteochondral fragments may have advantages over removal.

Authors: M. Jackson, M. Kummer, J. Auer , R. Hagen , A. Fuerst
Journal: Veterinary and Comparative Orthopaedics and Traumatology

This prospective study describes a series of 18 olecranon fractures in 16 horses that were treated with locking compression plates (LCP). Twelve of the 18 fractures were simple (type 2), whereas six were comminuted (type 4). Six fractures were open and 12 were closed. Each horse underwent LCP osteosynthesis consisting of open reduction and application of one or two LCP. Complete fracture healing was achieved in 13 horses. Three horses had to be euthanatized: two because of severe infection and one because of a comminuted radial fracture 11 days after fixation of the olecranon fracture.