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. 2016 Oct;98 B(10 Supple B):41-47.
doi: 10.1302/0301-620X.98B10.BJJ-2016-0474.R1.

Ten- to 15-year results of the Oxford Phase III mobile unicompartmental knee arthroplasty: a prospective study from a non-designer group

L A Lisowski  1 , L I Meijer  1 , M P J van den Bekerom  2 , P Pilot  3 , A E Lisowski  4
Affiliations

Ten- to 15-year results of the Oxford Phase III mobile unicompartmental knee arthroplasty: a prospective study from a non-designer group

L A Lisowski et al. Bone Joint J. 2016 Oct.

Abstract

Aims: The interest in unicompartmental knee arthroplasty (UKA) for medial osteoarthritis has increased rapidly but the long-term follow-up of the Oxford UKAs has yet to be analysed in non-designer centres. We have examined our ten- to 15-year clinical and radiological follow-up data for the Oxford Phase III UKAs.

Patients and methods: Between January 1999 and January 2005 a total of 138 consecutive Oxford Phase III arthroplasties were performed by a single surgeon in 129 patients for medial compartment osteoarthritis (71 right and 67 left knees, mean age 72.0 years (47 to 91), mean body mass index 28.2 (20.7 to 52.2)). Both clinical data and radiographs were prospectively recorded and obtained at intervals. Of the 129 patients, 32 patients (32 knees) died, ten patients (12 knees) were not able to take part in the final clinical and radiological assessment due to physical and mental conditions, but via telephone interview it was confirmed that none of these ten patients (12 knees) had a revision of the knee arthroplasty. One patient (two knees) was lost to follow-up.

Results: The mean follow-up was 11.7 years (10 to 15). A total of 11 knees (8%) were revised. The survival at 15 years with revision for any reason as the endpoint was 90.6% (95% confidence interval (CI) 85.2 to 96.0) and revision related to the prosthesis was 99.3% (95% CI 97.9 to 100). The mean total Knee Society Score was 47 (0 to 80) pre-operatively and 81 (30 to 100) at latest follow-up. The mean Oxford Knee Score was 19 (12 to 40) pre-operatively and 42 (28 to 55) at final follow-up. Radiolucency beneath the tibial component occurred in 22 of 81 prostheses (27.2%) without evidence of loosening.

Conclusion: This study supports the use of UKA in medial compartment osteoarthritis with excellent long-term functional and radiological outcomes with an excellent 15-year survival rate. Cite this article: Bone Joint J 2016;98-B(10 Suppl B):41-7.

Keywords: Knee; Long-term outcome; Minimally invasive surgical technique; Non-designer; Unicompartmental.

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Figures

Fig. 1
Fig. 1
Kaplan-Meier Estimates of Survival Function. Survival based on revisions for any reason and for prosthesis specific reasons. Revisions due to pain or disease progression were not considered prosthesis related. Five year survival based on revision for any reason: 96.2% (95% confidence interval (CI): 93.0 to 99.5%). Seven year survival based on revision for any reason: 93.8% (95% CI: 89.6 to 98.0%). Ten year survival based on revision for any reason: 91.6% (95%CI: 87.1 to 96.8%). 12 year survival based on revision for any reason: 90.6% (95%CI: 85.2 to 96.0%).
Fig. 2
Fig. 2
Annual number of Oxford Phase III arthroplasties performed by the single surgeon.
See this image and copyright information in PMC

References

    1. Ritter MA, Faris PM, Thong AE, et al. Intra-operative findings in varus osteoarthritis of the knee. An analysis of pre-operative alignment in potential candidates for unicompartmental arthroplasty. J Bone Joint Surg [Br] 2004;86-B:43–47. - PubMed
    1. Repicci JA, Eberle RW. Minimally invasive surgical technique for unicondylar knee arthroplasty. J South Orthop Assoc 1999;8:20–27. - PubMed
    1. Murray DW, Goodfellow JW, O’Connor JJ. The Oxford medial unicompartmental arthroplasty: a ten-year survival study. J Bone Joint Surg [Br] 1998;80-B:983–989. - PubMed
    1. Goodfellow J, O’Connor J, Murray DW. The Oxford meniscal unicompartmental knee. J Knee Surg 2002;15:240–246. - PubMed
    1. Rajasekhar C, Das S, Smith A. Unicompartmental knee arthroplasty. 2- to 12-year results in a community hospital. J Bone Joint Surg [Br] 2004;86-B:983–985. - PubMed

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