Mechanical Evaluation of Adjunctive Fixation for Prevention of Periprosthetic Femur Fracture With the Zurich Cementless Total Hip Prosthesis. Issue 5 (3rd June 2013)

• Record Type: Journal Article
• Authors: Pozzi, Antonio; Peck, Jeffrey N.; Chao, Peini; Choate, Christina J.; Barousse, Dan; Conrad, Bryan
• Is Part Of: Veterinary surgery. Volume 42:Issue 5(2013)
• Page Start: 529
• Page End: 534
• Publication Date: 2013-06-03
• Subjects: Veterinary surgery -- Periodicals; Veterinary Medicine -- Periodicals; Surgery -- Periodicals; Societies, Medical -- Periodicals; 636.0897
• DOI: 10.1111/j.1532-950X.2013.12018.x
• Languages: English
• ISSNs: 0161-3499

Abstract

Abstract: Objective: To evaluate whether cerclage wire or a lateral plate increases the peak‐torque load to failure, compared to femora without adjunctive fixation, in femora implanted with Zurich Cementless stems. Study Design: In vitro biomechanical study. Sample Population: Paired femora from adult dogs (n = 24) weighing 28–35 kg. Methods: Pairs of femora were implanted with a stem and randomly assigned to 2 treatment groups: cerclage or plate. Within each pair, either 3 loop cerclage wires or a laterally applied 12‐hole Advanced Locking Plate System 10‐mm plate (ALPS 10) were implanted in a femur, whereas the contralateral femur acted as control with no adjunctive fixation. After application of a static axial load each specimen was loaded to failure in torsion. Peak torque load at failure was compared between femora with each adjunctive fixation and the control using a paired t ‐test; P < .05 was considered significant. Results: In both treatment groups, femora with adjunctive fixation failed at higher loads compared to the femora without fixation; however, significant difference in peak torque at failure between treated femora and control was found only in the plated group ( P < .05). Femora implanted with plates and with cerclage were 13.9% and 7.2% stronger in torsion than the femora without fixation, respectively. Conclusions: Adjunctive fixation with a laterally applied ALPS 10 may aid in the prevention of peri‐prosthetic fractures associated with Zurich Cementless medium stems.