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Outcomes and early revision rate after medial unicompartmental knee arthroplasty: prospective results from a non-designer single surgeon.

Abstract：

BACKGROUND:This prospective study evaluates outcomes and reoperation rates for unicompartmental knee arthroplasty (UKA) from a single non-designer surgeon using relatively extended criteria of degenerative changes of grade 2 or above in either or both non-operated compartments. METHODS:187 consecutive medial mobile bearing UKA implants were included after history, clinical assessment and radiological evaluation. 91 patients had extended clinical outcomes. Post-operative assessment included functional scoring with the Oxford Knee Score (OKS) and radiographic review. Survivorship curves were constructed using the life-table method, with 95% confidence intervals calculated using Rothman's equation. Separate endpoints were examined: revision for any reason and revision for confirmed loosening. RESULTS:The mean follow-up was 3.5 years. The pre-operative OKS improved from a mean of 21.2 to 38.9 (Mann-Whitney U Test, p = < 0.001). Twelve Patients required further operations including 9 revisions. No patients developed deep infection and no surviving implants were loose radiographically. Survivorship at 7 years with endpoints of re-operation, revision and aseptic loosening at surgery or radiographically was 88.4% (95% CI 79.6-93.7), 93.1% (95% CI 85.5-96.9) and 97.3% (95% CI 91.2-99.2) respectively. The presence of pre-operative mild contralateral tibiofemoral or any extent of patellofemoral joint degeneration was of no consequence. DISCUSSION:The indications for UKA are being expanded to include patients with greater deformity, more advanced disease in the patellofemoral joint and even certain features in the lateral compartment indicative of an anteromedial pattern of osteoarthritis (OA). However, much of the supporting literature remains available only from designer centres. This study represents a group of patients with what we believe to be wider indications, along with decisions to treat made on clinical grounds and radiographs alone. CONCLUSION:This study shows comparable clinical outcomes of UKA for extended indications from a high volume, high-usage non-designer unit.

journal_name

BMC Musculoskelet Disord

journal_title

BMC musculoskeletal disorders

authors

Hutt JRB,Sur A,Sur H,Ringrose A,Rickman MS

doi

10.1186/s12891-018-2099-2

subject

Has Abstract

pub_date

2018-05-29 00:00:00

pages

172

issue

issn

1471-2474

pii

10.1186/s12891-018-2099-2

journal_volume

pub_type

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Outcomes and early revision rate after medial unicompartmental knee arthroplasty: prospective results from a non-designer single surgeon.