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. 2021 Mar 20:17:176-181.
doi: 10.1016/j.jcot.2021.03.012. eCollection 2021 Jun.

Regional five-year clinical outcomes of 289 consecutive cementless oxford uni-compartmental knee replacements at a non-inventor centre

R Nandra  1 , H D Rajgor  1 , C Winkworth  1 , N Aslam  1
Affiliations

Regional five-year clinical outcomes of 289 consecutive cementless oxford uni-compartmental knee replacements at a non-inventor centre

R Nandra et al. J Clin Orthop Trauma. .

Erratum in

  • Erratum regarding previously published articles.
    [No authors listed] [No authors listed] J Clin Orthop Trauma. 2021 Jul 30;20:101538. doi: 10.1016/j.jcot.2021.101538. eCollection 2021 Sep. J Clin Orthop Trauma. 2021. PMID: 34405083 Free PMC article.

Abstract

Introduction: Uncemented unicompartmental knee replacement offers a minimally invasive approach, faster rehabilitation and good levels of function, supported by evidence reporting low intra-operative fracture rate and mid-term stability with no implant migration at 5-years. Our aim was to examine the clinical outcomes in 289 consecutive Oxford unicompartmental knee arthroplasties (257 patients), five years post-operatively.

Methods: A retrospective study of patients treated between 2008 and 2014 in a non-inventor centre by a single surgeon was performed. Patients with anteromedial bone on bone uni-compartmental arthritis were included. Oxford Knee Scores (OKSs) at last follow-up were recorded, intra-operative complications reported with commentary on revision cases.

Results: Mean age of patients was 66 years (SD 9.6, 45-88 years). 122 (42%) patients were female and 135 (58%) were male. Patient in our study were ASA 1 (36%), ASA 2 (62%) and ASA 3 (01%). There were no intra-operative complications, particularly tibia fractures during impaction. The average oxford knee score was 40.1 (n = 232, Range 06 to 48, SD 8.46) at an average 6 years and 3 months from surgery, including revised patients. Six patients had their prosthesis revised within five-years of the index surgery. Five-year cumulative implant survival rate was 97.8% (95% CI 97.62 to 97.98, SE 0.09). Indications for revision were: lateral side wear (n = 1); dislocated spacer (n = 4); instability and spacer subluxation (n = 1). Thirteen patients died within five years of surgery Five-year cumulative survival rate was 94.9% (95% CI 94.87 to 94.925, SE 0.013).

Conclusion: The proportion of patients requiring revision at five-years is lower than that generally reported for UKR. These findings add support for the use of the cementless oxford UKR outside the design centre.

Keywords: Knee arthroplasty; Unicompartmental knee replacement.

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Figures

Fig. 1
Fig. 1
A flow chart quantifying the number of patents who had died, were lost to follow-up (LFU) or revised at sequential time intervals from index surgery.
Fig. 2
Fig. 2
Kaplan---Meier curve with cumulative implant survival in months. Vertical lines indicate censoring.
Fig. 3
Fig. 3
Post-operative AP radiograph of 51-year-old gentleman undergoing medial OKR with preservation of lateral joint articular cartilage.Medial joint line elevated and over-stuffing had occurred.
Fig. 4
Fig. 4
Lateral radiograph of patient with polyethylene insert dislocation of right knee.
Fig. 5
Fig. 5
Kaplan-Meier estimate of patient survival in months from index procedure.
Fig. 6
Fig. 6
AP X-Ray of left knee at time of injury with a medial tibial plateau fracture.
Fig. 7
Fig. 7
AP X-Ray of left knee 3 months following injury.
See this image and copyright information in PMC

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