THE EARLY FAILURE OF THE OXFORD PHASE 3 UNICOMPARTMENTAL KNEE ARTHROPLASTY – AN AUDIT OF REVISIONS. THE NEW ZEALAND EXPERIENCE

N.I. Hartnett; R.J.A. Tregonning; A. Rothwell; T. Hobbs

doi:10.1302/0301-620X.88BSUPP_II.0880318

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THE EARLY FAILURE OF THE OXFORD PHASE 3 UNICOMPARTMENTAL KNEE ARTHROPLASTY – AN AUDIT OF REVISIONS. THE NEW ZEALAND EXPERIENCE

N.I. Hartnett
R.J.A. Tregonning
A. Rothwell
T. Hobbs

THE EARLY FAILURE OF THE OXFORD PHASE 3 UNICOMPARTMENTAL KNEE ARTHROPLASTY – AN AUDIT OF REVISIONS. THE NEW ZEALAND EXPERIENCE

Hartnett N, Tregonning R, Rothwell A, Hobbs T. THE EARLY FAILURE OF THE OXFORD PHASE 3 UNICOMPARTMENTAL KNEE ARTHROPLASTY – AN AUDIT OF REVISIONS. THE NEW ZEALAND EXPERIENCE. Orthop Procs. 2006;88-B(SUPP_II):318-318. doi:10.1302/0301-620X.88BSUPP_II.0880318

Hartnett, N.I., et al. “THE EARLY FAILURE OF THE OXFORD PHASE 3 UNICOMPARTMENTAL KNEE ARTHROPLASTY – AN AUDIT OF REVISIONS. THE NEW ZEALAND EXPERIENCE.” Orthopaedic Proceedings, vol. 88-B, no. SUPP_II, 2006, pp. 318-318., https://doi.org/10.1302/0301-620X.88BSUPP_II.0880318

Hartnett, N., Tregonning, R., Rothwell, A., & Hobbs, T. (2006). THE EARLY FAILURE OF THE OXFORD PHASE 3 UNICOMPARTMENTAL KNEE ARTHROPLASTY – AN AUDIT OF REVISIONS. THE NEW ZEALAND EXPERIENCE. Orthopaedic Proceedings, 88-B(SUPP_II), 318-318. https://doi.org/10.1302/0301-620X.88BSUPP_II.0880318

Hartnett, N., Tregonning, R., Rothwell, A. and Hobbs, T. (2006) “THE EARLY FAILURE OF THE OXFORD PHASE 3 UNICOMPARTMENTAL KNEE ARTHROPLASTY – AN AUDIT OF REVISIONS. THE NEW ZEALAND EXPERIENCE.” Orthopaedic Proceedings, 88-B(SUPP_II), pp. 318-318. Available at: https://doi.org/10.1302/0301-620X.88BSUPP_II.0880318

Hartnett, N.I., R.J.A. Tregonning, A. Rothwell, and T. Hobbs. “THE EARLY FAILURE OF THE OXFORD PHASE 3 UNICOMPARTMENTAL KNEE ARTHROPLASTY – AN AUDIT OF REVISIONS. THE NEW ZEALAND EXPERIENCE.” Orthopaedic Proceedings 88-B, no. SUPP_II (2006): 318-318. https://doi.org/10.1302/0301-620X.88BSUPP_II.0880318

Hartnett N, Tregonning R, Rothwell A, Hobbs T. THE EARLY FAILURE OF THE OXFORD PHASE 3 UNICOMPARTMENTAL KNEE ARTHROPLASTY – AN AUDIT OF REVISIONS. THE NEW ZEALAND EXPERIENCE. Orthop Procs. 2006 May 1;88-B(SUPP_II):318-318. https://doi.org/10.1302/0301-620X.88BSUPP_II.0880318

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Abstract

To identify frequency and patterns of Oxford Phase 3 UKA failure in New Zealand through analysis of national primary and revision data.

Retrospective audit examining all revision Oxford Phase 3 UKAs recorded in the New Zealand National Joint Register from January 2000 to October 2003 were analysed along with surgeons’ clinical notes and patient x-rays.

Seventy-three Orthopædic Surgeons performed 1216 Oxford UKAs. The average age was 66.4 years (range 35–94). Osteoarthritis was the primary diagnosis for 1163 (96%) patients. Mean time to revision was 437 days (14.4 months). The early revision rate was 2.2% (n=27). The most common reasons for revision were aseptic loosening (n=7, 26%), bearing dislocation (n=5, 19%) and pain (n=4, 15%). The deep infection rate was 0.16% (2/1216). Eighteen surgeons (high use > 8 UKAs/year) performed 787 (64%) operations, with a revision rate of 1.5%. Twenty-two surgeons (low use ≤ 1 UKA/year) performed 38 (3%) operations, with a revision rate of 8%. This was statistically significant, p= 0.03 (odds ratio 5.7).

The early revision rate for the Oxford UKA is 1.4 times greater than TKA. High use surgeons revision rate is lower than TKA. An inverse relationship between failure and surgeon experience exists. This confirms Swedish Knee Arthroplasty Register findings.

The abstracts were prepared by Editorial Secretary Jean-Claude Theis. Correspondence should be addressed to NZOA at Department of Orthopaedic Surgery, Dunedin Hospital, Private Bag 1921, Dunedin, New Zealand.