Biomechanical Comparison of Two Plating Techniques for Fixation of Acetabular Osteotomies in Dogs

Abstract

Because of the relative ease of application, the 2.7-mm curved AP may be the practical choice for acetabular fracture repair in large dogs.

Biomechanical Evaluation of Acetabular Cup Implantation in Cementless Total Hip Arthroplasty

“…19 Hardie et al 16 evaluated 2 plate constructs for fixation of acetabular osteotomies using a very similar study design. Load to failure with 2 different acetabular plates was 2721 AE 632 and 2488 AE 800 N. 16 Mode of failure in our study was reported as cup displacement or pelvic fracture. Clinically, cup displacement could occur from inappropriate cup positioning, incomplete impaction, poor dorsal coverage of the implant, or poor bone quality.…”

“…The hemipelvis was oriented at 201 on the ilioischial axis and 01 on the dorsal plane to simulate pelvic orientation of a walking dog in midstride. 15,16 The femoral head and stem were used to transmit load to the acetabular cup (Fig 1). The preparation was preconditioned by 5 cycles of axial loading at 0.5 Hz from 5 to 100 N to ensure seating of all components.…”

Locking Plate Fixation for Canine Acetabular Fractures

“…10 Numerous surgical methods to stabilize acetabular fractures have been reported including dynamic compression plates, acetabular plates, reconstruction plates, luted reconstruction plates and use of screws and wire, with or without polymethyl methacrylate. 1,5,9,[11][12][13][14][15][16][17][18][19] Biomechanical in vitro evaluation of different types fixation methods has been previously published, 17,20,21 including one study which compared use of locking versus non-locking plate and screw constructs. 22 Increasing implant construct stiffness by use of techniques such as plate luting has been suggested to reduce strain at the fracture site and to decrease the risk for implant failure.…”

Ex Vivo Biomechanical Comparison of the 2.4 mm UniLOCK® Reconstruction Plate Using 2.4 mm Locking Versus Standard Screws for Fixation of Acetabular Osteotomy in Dogs

“…Canine acetabula were chosen to represent a commonly encountered fracture where contouring the plate to the dorsal surface of the acetabular rim is often the most challenging component of the procedure 1–3,5,15,19 . Various plate fixation methods have been evaluated for the repair of these difficult fractures, none of which attempt to circumvent the difficulties associated with the loss of primary reduction that commonly occurs after plate application if adequate plate contouring is not achieved 1,2,5–7,12,18 . The 2.4 mm uniLOCK ® reconstruction plate was selected because of the comparative ease and accuracy in which it may be contoured to the dorsal acetabular rim, as well as its ability to accept both locking and standard screws.…”

“…REPORTED TECHNIQUES for stabilization of acetabular fractures include the use of veterinary acetabular plates, 1–3 dynamic compression plates, 4,5 reconstruction plates with or without plate luting, 3,6–8 composite fixation using screws/wires/polymethyl‐methacrylate, 4,9–11 and miniplates 12,13 . Although satisfactory clinical outcomes after standard plating techniques and composite fixation have been reported in most retrospective studies of canine acetabular fractures, 1–4,6–8,14 clinical and experimental results have identified some inherent difficulties and limitations 1–4,6,11,12,14–18 . The primary challenge is contouring the plate to the irregular dorsal surface of the acetabulum and then maintaining fracture reduction during plate application.…”