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Objectives:
Rupture of the cranial cruciate ligament (CrCL) can be treated by synthetic intra-articular reconstruction using UHMWPE implants fixed by interference screws in femoral and tibial bone tunnels. Tibial anchorage is the weakest point of the construct thus an innovative fixation system has been developed to improve tibial fixation.
Methods:
Fixation of the UHMWPE implant (Novalig, Novetech Surgery, France) performed using a new fixation system (NovaFix®, Novetech Surgery, France) (4 specimens instrumented) was compared to fixation using a single interference screw (4 specimens) during ex-vivo biomechanical quasi-static tests performed on tibias of 35-45 kg canine cadavers. Both the NovaFix® and the interference screws were inserted out-in. Samples were pre-loaded at 10N (20 mm/min) before starting the quasi-static test at 1 mm/min until rupture
Results:
NovaFix® leads to significant 96%-higher pull-out strength within 3-mm displacement (563 N ±109 vs. 287 N ±56; Mann-Whitney p-value =0.028), non-significant 175%-higher ultimate load (947 N ±281 vs. 344 N ±113; Mann-Whitney p-value =0.052) and non-significant higher linear stiffness (230 N/mm ±52 vs. 141 N/mm ±53; Mann-Whitney p-value =0.052) compared to fixation by an interference screw.
Conclusions:
NovaFix® shows a significant improvement of the tibial fixation in quasi-static tests compared to conventional fixation. But these results are limited by the small number of tests performed due to low number of anatomical specimens available. Cycling tests are required to assess the stability of the fixation by NovaFix® during repeated efforts.
34th Annual Scientific Meeting proceedings
Stream:
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Session:
Date/Time: 30-11--0001 (00:00 - 00:00) | Location:
Date/Time: 30-11--0001 (00:00 - 00:00) | Location:
Ex-vivo biomechanical quasi-static test of a novel implant fixation system for intra-articular cranial cruciate ligament repair in canine cadaver models
Hebrard L HL1, Goin GB3, Crumière CA3, Massenzio MM2, Lafon LY2, Buttin BP4, Viguier VE*1, Cachon CT*1
1Université de Lyon, VetAgro Sup, Interactions Cellules Environnement (ICE), Marcy l'Etoile, France, 2Univ Eiffel, Univ Lyon 1, LBMC UMR T_9406, Lyon, France, 3Novetech Surgery, Nice, France, 4Itinerant surgeon, Villaz, France.
Objectives:
Rupture of the cranial cruciate ligament (CrCL) can be treated by synthetic intra-articular reconstruction using UHMWPE implants fixed by interference screws in femoral and tibial bone tunnels. Tibial anchorage is the weakest point of the construct thus an innovative fixation system has been developed to improve tibial fixation.
Methods:
Fixation of the UHMWPE implant (Novalig, Novetech Surgery, France) performed using a new fixation system (NovaFix®, Novetech Surgery, France) (4 specimens instrumented) was compared to fixation using a single interference screw (4 specimens) during ex-vivo biomechanical quasi-static tests performed on tibias of 35-45 kg canine cadavers. Both the NovaFix® and the interference screws were inserted out-in. Samples were pre-loaded at 10N (20 mm/min) before starting the quasi-static test at 1 mm/min until rupture
Results:
NovaFix® leads to significant 96%-higher pull-out strength within 3-mm displacement (563 N ±109 vs. 287 N ±56; Mann-Whitney p-value =0.028), non-significant 175%-higher ultimate load (947 N ±281 vs. 344 N ±113; Mann-Whitney p-value =0.052) and non-significant higher linear stiffness (230 N/mm ±52 vs. 141 N/mm ±53; Mann-Whitney p-value =0.052) compared to fixation by an interference screw.
Conclusions:
NovaFix® shows a significant improvement of the tibial fixation in quasi-static tests compared to conventional fixation. But these results are limited by the small number of tests performed due to low number of anatomical specimens available. Cycling tests are required to assess the stability of the fixation by NovaFix® during repeated efforts.
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