Niemeläinen, Mika J, et al. “The Effect of Fixation Type on the Survivorship of Contemporary Total Knee Arthroplasty in Patients Younger Than 65 Years of Age: A Register- Based Study of 115,177 Knees in the Nordic Arthroplasty Register Association (NARA) 2000–2016”. Acta Orthopaedica, vol. 91, no. 2, Jan. 2020, pp. 184-90, doi:10.1080/17453674.2019.1710373.