SciELO - Scientific Electronic Library Online

vol.7 número1 índice de autoresíndice de assuntospesquisa de artigos
Home Pagelista alfabética de periódicos  

Serviços Personalizados



Links relacionados

  • Em processo de indexaçãoCitado por Google
  • Em processo de indexaçãoSimilares em Google


SA Orthopaedic Journal

versão On-line ISSN 2309-8309
versão impressa ISSN 1681-150X

SA orthop. j. vol.7 no.1 Centurion Jan./Mar. 2008




Do patients prefer a unicompartmental to a total knee replacement?



PJ (Spike) Erasmus; Lizette Pieterse; Edwin Dillon

Stellenbosch Knee Clinic, Stellenbosch Medi-Clinic In association with the Department of Orthopaedic Surgery, University of Stellenbosch

Reprint requests




BACKGROUND: Very few direct comparative studies evaluating the results after unicompartmental knee replacement (UKA) and total knee replacement (TKA) are available. Only three previous studies have reported the results of UKA and TKA performed in the same patient. We report our results of simultaneous UKA and TKA in the same patient, performed under the same anaesthetic, at same the time, by the same surgeon. This is the first study to assess the results of UKA and TKA in the same patient, where all the patients had the procedures performed under the same anaesthetic at the same time
MATERIALS AND METHODS: Twenty-one patients who had simultaneous primary UKA in one knee and primary TKA in the other knee were evaluated prospectively by means of the SANE (Single Assessment Numerical Evaluation) rating. In addition each patient was asked the simple question: "Which is your preferred knee?"
RESULTS: The follow-up period was a mean of 26 months (range 12-58 months). We found a statistically significant improvement in the SANE in both the UKAs and TKAs. Eleven patients had no preference between the UKA and the TKA (52.4%), seven patients preferred the TKA (33.3%) while three patients stated that the UKA was their preferred knee (14.3%). The trend for patients to prefer the TKA was not statistically significant (p= 0.27).
CONCLUSIONS: UKAs have been shown to be kinematically superior and the preservation of the cruciate ligaments affords better proprioception than a TKA. However, the findings of this study suggest that this does not translate to a better patient preference. In view of this finding, and considering the documented inferior survival rates of UKAs, we propose that the role of UKA in the treatment of gonarthrosis be reassessed.



“Full text available only in PDF format”



1. Patil S, Coldwell CW, Ezzet KA, Lima DDD. Can normal knee kinematics be restored with unicompartmental knee replacement? J Bone Joint Surg Am 2005; 87:332-8.         [ Links ]

2. Cameron HU, Jung YB. A comparison of unicompartmental knee replacement with total knee replacement. Orthop Rev 1988; 983.         [ Links ]

3. Cobb AG, Kozinin SC, Scott RD. Unicondylar or total knee replacement: patient preference. J Bone Joint Surg Am 1990; 72B:166.         [ Links ]

4. Laurencin CT, Zelicof SB, Scott RD, Ewald FC. Unicompartmental versus total knee arthroplasty in the same patient, Clin Orthop 1991; 273:151-156.         [ Links ]

5. Williams GN, Taylor DC, Gangel TJ, Uhorchak JM, Arciero RA. Comparison of the single assessment numeric evaluation method and the Lysholm score. Clin Orthop2000; 373:184-192.         [ Links ]

6. Amin AK, Patton JT, Cook RE, Gaston M, Brenkel IJ. Unicompartmental or total knee arthroplasty? Results from a matched study. Clin Orthop 2006; 451: 101-106.         [ Links ]



Reprint requests:
Dr PJ Erasmus
G3 Stellenbosch Medi-Clinic
Die Boord, Stellenbosch
7600 tel.: (021) 882 8210; Fax: (021) 882 9915



No benefits in any form have been received or will be received from a commercial party related directly or indirectly to the subject of this article. This research was not submitted to an ethical committee. This article is free of plagiarism.

Creative Commons License Todo o conteúdo deste periódico, exceto onde está identificado, está licenciado sob uma Licença Creative Commons