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. 2015 Nov 17;46(4):417-9.
doi: 10.1016/S2255-4971(15)30255-X. eCollection 2011 Jul-Aug.

FEMORAL ROLL BACK IN TOTAL KNEE ARTHROPLASTY: COMPARISON BETWEEN PROSTHESES THAT PRESERVE AND SACRIFICE THE POSTERIOR CRUCIATE LIGAMENT

Lúcio Honório de Carvalho Júnior  1 , Luiz Fernando Machado Soares  2 , Matheus Braga Jacques Gonçalves  2 , Leonardo Lanziotti Costa  3 , Lincoln Paiva Costa  3 , Rodrigo Rosa Lessa  3 , Marcelo Lobo Pereira  3
Affiliations

FEMORAL ROLL BACK IN TOTAL KNEE ARTHROPLASTY: COMPARISON BETWEEN PROSTHESES THAT PRESERVE AND SACRIFICE THE POSTERIOR CRUCIATE LIGAMENT

Lúcio Honório de Carvalho Júnior et al. Rev Bras Ortop. .

Abstract

To compare the rollback of the contact point between the femoral component and the tibial polyethylene as the knee is flexed, in two types of total knee arthroplasty: one that sacrifices and the other that preserves the posterior cruciate ligament (PCL).

Methods: Under fluoroscopy, 36 knees from 32 patients who underwent total knee arthroplasty were evaluated. Using lateral images, the contact points between the femur and the tibial polyethylene with the knee in complete extension and at 90° of flexion were measured, thereby measuring the percentage rollback of the femur in arthroplasties in which the PCL was sacrificed and in those in which it was preserved.

Results: The mean percentage rollback of the femur was 13.24% in the cases in which the PCL was sacrificed and 5.75% in the cases in which it was preserved. The difference between these measurements was statistically significant (p = 0.026615).

Conclusion: In total knee arthroplasty, sacrificing the PCL increased the rollback of the contact point between the femur and tibia as the knee was flexed up to 90°.

Keywords: Arthroplasty; Articular; Biomechanics; Knee; Range of Motion; Replacement.

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Figures

Figure 1
Figure 1
Image showing determination of the point of peak load-bearing in extension and flexion, for calculating the rollback rate.
Figure 2
Figure 2
Rollback of contact point between the femur and tibia in total knee arthroplasty, as the flexion increases.
See this image and copyright information in PMC

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