The Oxford unicompartmental knee prosthesis: an independent 10-year survival analysis

Abstract

One hundred forty-nine medial prostheses were implanted in 140 patients between 1988 and 1996. After a mean of 67 months 28 patients had died, without the need for revision. Seventeen prostheses were lost to follow-up. Revision surgery using a total knee prosthesis was performed in 16 cases. In four others, a lateral prosthesis was implanted subsequently to a medial one. One of these four was revised to a total knee prosthesis 6 years later. In another four cases, late complications of the meniscal bearing were treated with replacement of this bearing. The surviving prostheses were seen back after a mean of 126 months. The cumulative survival rate at 10 years was 82% for the whole population and 84% when knees with a previous high tibial osteotomy were excluded. Since these results compare poorly to the survival of total knee arthroplasty, this prosthesis is not the first-choice implant. Because it preserves a maximum of bone stock and is revised to a total prosthesis almost without difficulty, it is the first-choice implant for medial unicompartmental osteoarthritis in patients younger than 65. Further research is mandatory to confirm that this prosthesis very rarely needs revision in patients older than 75. It should not be used in osteotomized knees.

No Long-term Difference Between Fixed and Mobile Medial Unicompartmental Arthroplasty

“…We observed three bearing dislocations within the first year, consistent with those reported in the literature [38,40,41]. The surgeon's fear of dislocation may lead to increase the polyethylene high and this may lead to an overcorrection of the deformation and consecutively to early arthritis progression in the lateral compartment as described in previous studies [11,38,40,41].…”

“…The surgeon's fear of dislocation may lead to increase the polyethylene high and this may lead to an overcorrection of the deformation and consecutively to early arthritis progression in the lateral compartment as described in previous studies [11,38,40,41]. We also observed five cases of progression of arthritis in the lateral compartment and within these five cases, three had early progression of osteoarthritis in the lateral compartment at a mean of 3.9 years related to overcorrection of the deformation.…”

“…Discrepancies have been observed between the survivorship reported in the United Kingdom by the Oxford Group and the survivorship reported in North American patients by independent teams [12,26,39,40], possibly related to the potential differences between the patients in the United Kingdom and in North America [7]. The survivorship reported in the Swedish and the Finnish Joint registry failed to demonstrate any difference between fixed-and mobile-bearing UKA [22-24, 34, 35].…”

Unicompartmental Versus Total Knee Arthroplasty Database Analysis: Is There a Winner?

“…Early survival studies of UKA demonstrated revision rates of 15% to 28% [23,34,44]. More recent articles report substantial increases in survival, with midterm survivorship for UKA of 84% to 98% (Table 1) [10,12,14,19,39,40,42,46,48,[57][58][59][60][61]. O'Rourke et al [43] followed by Price and Svard [49] documented long-term survival rates of UKA at 20 years of 84% and 91%, respectively.…”

Sports activities after medial unicompartmental knee arthroplasty Oxford III—What can we expect?

“…The indication for surgery in all patients was medial osteoarthritis of the knee with pain only localised in the medial compartment. We followed indications and contraindications as recommended in the current literature [18,23]. The following main prerequisites had to be fulfilled for surgery: intact ligaments, esp.…”