Five-year survivorship and patient-reported outcome of the Triathlon single-radius total knee arthroplasty
- 891 Downloads
The Triathlon single-radius total knee arthroplasty (TKA) was used in 11 % of primary procedures in England and Wales in 2011 making it the third most common prosthesis implanted. To date, there has been no independent report of survivorship or outcome for this implant. The aim of this study was to report the 5-year survival and patient-reported outcome of the Triathlon TKA in a single independent centre.
Four hundred and sixty-two consecutive Triathlon TKAs were implanted at the study centre from 2006 to 2007. The mean age was 68.7 (21–89) years, and 290 patients were women (62.7 %). The Short Form 12 and Oxford Knee Score (OKS) were obtained pre-operatively and at 1 and 5 years post-operatively when satisfaction was also assessed and radiographs reviewed.
Forty-one had died and nine were lost to follow-up. There were three aseptic failures: two cases of tibial aseptic loosening and one of secondary instability. There were five additional septic failures. OKS improved by a mean of 17.4 points at 1 year from 41.3 pre-operatively (p < 0.001). This was unchanged at 5 years (n.s.). Patient satisfaction was high with 88 % being satisfied or very satisfied at 1 and 5 years. Kaplan–Meier analysis demonstrated a 5-year survival of 97.6 % (95 % CI 95.6–99.6) for failure for any reason, and 99.5 % (95 % CI 98.7–100) for aseptic loosening.
The Triathlon TKA offers good mid-term survivorship and functional outcome, which is reflected by a high patient satisfaction rate.
Level of evidence
Therapeutic, Level IV.
KeywordsTotal knee arthroplasty Single radius Outcome Satisfaction Midterm survivorship
We extend our thanks to our consultant colleagues Mr Justin Lade, Mr Graham Lawson, Mr Sam Patton, and Mr Frazer Wade whose patients were also included in this study.
- 2.Baker PN, van der Meulen JH, Lewsey J, Gregg PJ, National Joint Registry for England and Wales (2007) The role of pain and function in determining patient satisfaction after total knee replacement. Data from the National Joint Registry for England and Wales. J Bone Jt Surg Br 89:893–900CrossRefGoogle Scholar
- 10.Eckhoff DG, Bach JM, Spitzer VM, Reinig KD, Bagur MM, Baldini TH, Rubinstein D, Humphries S (2003) Three-dimensional morphology and kinematics of the distal part of the femur viewed in virtual reality. Part II. J Bone Jt Surg Am 85(Suppl 4):97–104Google Scholar
- 12.Frankel VH, Burstein AH, Brooks DB (1971) Biomechanics of internal derangement of the knee. Pathomechanics as determined by analysis of the instant centers of motion. J Bone Jt Surg Am 53:945–962Google Scholar
- 16.Hospital-Episode-Statistics. Finalised Patient Reported Outcome Measures (PROMs) in England: April 2009–March 2010. http://www.hscic.gov.uk/catalogue/PUB02429
- 21.None-Listed (2011) Prostheses used in hip knee and ankle replacements 2011. http://www.njrcentre.org.uk/njrcentre/Portals/0/Documents/England/Reports/9th_annual_report/Prostheses%20used%20in%20hip%20knee%20and%20ankle%20replacements%202011.pdf. 21 Nov 2012
- 22.None-Listed (2012) Australian Orthopaedic Association: National Joint Replacement Registry Hip and Knee Arthroplasty Annual Report 2012. https://aoanjrr.dmac.adelaide.edu.au/documents/10180/60142/Annual%20Report%202012?version=1.2&t=1355186837517. 21 Nov 2012
- 23.None-Listed (2012) NJR of England and Wales: 9th Annual Report. http://www.njrcentre.org.uk/njrcentre/Portals/0/Documents/England/Reports/9th_annual_report/NJR%209th%20Annual%20Report%202012.pdf. 21 Nov 2012