SAN DIEGO — Results of a prospective randomized study of polyethylene used in total knee arthroplasty revealed no differences in survivorship at the 5-year follow-up based on the type of polyethylene used. However, investigators recommended that patients with the brands of highly-crosslinked and conventional polyethylene studied undergo continued follow-up.
“There was also no significant difference in clinical outcomes and, importantly, no significant difference in complications with the highly-crosslinked polyethylene,” Matthew P. Abdel, MD, said when he presented the level-1 study at the American Academy of Orthopaedic Surgeons Annual Meeting.
Abdel and colleagues studied 515 patients undergoing total knee arthroplasty (TKA) with the all-cemented, posterior-stabilized, fixed-bearing Stryker Triathlon Total Knee System with patellar resurfacing. Overall, 259 patients received X-3 polyethylene — which is highly crosslinked — and 256 patients received conventional N2vac polyethylene.
The 5-year survivorship analysis showed no differences between the groups in terms of being free of any revision or reoperation of any kind, Abdel said.
There were also essentially no significant differences between the groups at middle-term follow-up for clinical outcomes based on the Knee Society Scores and SF-12 physical and mental scores.
“With regard to complications, you can see that there is a similar rate between the X-3 and N2vac group,” Abdel said.
Of important note at this mid-term follow-up study, there were no early failures due to X-3 highly-crosslinked polyethylene fractures, particularly at the tibial post or the patellar pads.” – by Susan M. Rapp
Abdel MP, et al. Paper #169. Presented at: American Academy of Orthopaedic Surgeons Annual Meeting; March 14-18, 2017; San Diego.
Disclosure: Abdel reports he is a paid consultant for Stryker, which manufactured the products studied and funded the study.