Vol. 33, No. 7, 2005 Biomechanical Comparison of PCL Reconstructions 981
Using the tibial inlay technique, we evaluated whether
a DB graft would differ from an SB graft in reproducing
stability to a PCL-deficient knee while controlling for the
amount of graft used under each testing condition. Our
results did not find any significant difference in transla-
tion between either of the reconstruction methods (ie, SB
vs DB) and the intact knee (P > .05). In addition, no sta-
tistical differences between the SB and DB reconstruc-
tions were found at any angle (P > .05). The DB construct
appeared to allow less posterior translation than seen with
the SB construct across all angles tested. This restraint to
posterior translation, however, was greater than that of
the intact knee from 30° to 60°.
There are limitations to our study. We did not perform
testing at flexion angles greater than 90°. Testing at flex-
ion angles greater than 90° could show differences that
were not revealed in our study. Additionally, our protocol
did not evaluate how the different grafts behaved over
time with extensive cycling. Such differences, if noted, may
be clinically relevant.
In conclusion, we did not identify any biomechanical
superiority in performing a DB reconstruction compared to
the SB technique and therefore did not support our hypoth-
esis. Although authors have reported advantages with the
DB method, we believe that by using the posterior tibial inlay
technique, the more technically challenging DB PCL recon-
struction may not offer any advantages over an SB graft.
The authors acknowledge the Musculoskeletal Transplant
Foundation for its generous donation of tissues used in
this research project. This study was supported by a grant
from the Cleveland Clinic Foundation Research Program
Committee and the Department of Orthopaedic Surgery,
Section of Sports Medicine Education and Research Fund.
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