Migration and Inducible Displacement of the Bicruciate-Stabilized Total Knee Arthroplasty: A Randomized Controlled Trial of Gap Balancing and Measured Resection Techniques.

Abstract Background The goal was to investigate the migration and inducible displacement of a bi-cruciate stabilized (BCS) total knee arthroplasty (TKA) implanted using gap balancing (GB) or measured resection (MR) surgical techniques. We hypothesized equal migration and displacement between the techniques. Methods The study was a single-blinded prospective randomized controlled trial, with allocation of 71 patients to either GB or MR groups. Fifteen patients were withdrawn, resulting in 31 patients in the GB group and 25 in the MR group. Patients received the JOURNEY IITM BCS implant. Migration and inducible displacement were evaluated using radiostereometric analysis and patient examinations were performed at a 2-week baseline, and at 6 weeks, 3 months, 6 months, 1 year, and 2 years post-operation. Results No differences (p>0.05) existed between GB and MR groups for any measurement of tibial or femoral migration. Both groups had tibial migrations below 0.5mm from baseline to 6 months, and below 0.2mm from both 6 months to 1 year and 1 to 2 years post-operation. No differences (p>0.05) were found between GB and MR groups for inducible displacement. Conclusions No differences were found in implant migration or inducible displacement between GB and MR groups. The BCS implant can be expected to have migration risks on par with industry standards and both surgical techniques are safe and effective options for implantation of this implant design.