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Arthroplasty 2019
June 24-25, 2019
Volume 14
Journal of Orthopaedics Trauma Surgery and Related Research
Arthroplasty
June 24-25, 2019 | Rome, Italy
12
th
International Conference on
Does unicompartmental knee arthroplasty have worse outcomes in spontaneous osteonecrosis of the knee
than in medial compartment osteoarthritis? A systematic review and meta-analysis
Chan Yoon
Seoul Bumin Hospital, Korea
Introduction:
The role of Unicompartmental knee arthroplasty (UKA) in spontaneous osteonecrosis of the knee (SONK)
remains controversial, even though SONK involves only one compartment of the knee joint. We aimed to compare the
survival rate and clinical outcomes of UKA in SONK and medial compartment osteoarthritis (MOA) via a meta-analysis
of previous studies.
Materials and Methods:
MEDLINE, Embase, and Cochrane Library were searched up to January 2018 with keywords
related to SONK and knee arthroplasty. Studies were selected with predetermined inclusion criteria: (1) medial UKA as
the primary procedure, (2) reporting implant survival or clinical outcomes of osteonecrosis and osteoarthritis, and (3)
follow-up period > 1 year. Quality assessment was performed using the risk of bias assessment tool for non-randomized
studies. A random-effects model was used to estimate the pooled relative risk (RR) and standardized mean difference.
Results:
The incidence of UKA revision for any reason was significantly higher in SONK than in MOA group (pooled
RR=1.83, p=0.009). However, the risk of revision due to aseptic loosening was not significantly different between the
groups (Figure 1). Moreover, when stratified by the study quality, high quality studies showed similar risk of overall
revision in SONK and MOA (p=0.71). Subgroup analysis revealed no significant difference in failure between SONK
and MOA after cemented mobile and fixed bearing UKA. Results of uncemented UKA was reported only in one study,
which showed higher failure of SONK compared to MOA. Clinical outcomes after UKA were similar between SONK
and MOA (p=0.66).
Conclusions:
Cemented UKA has similar survival and clinical outcomes in SONK and MOA. Prospective studies
designed specifically to compare the UKA outcomes in SONK and MOA are necessary.
J.Orthop.Trauma Surg.Relat.Res. | Volume 14
ISSN:2449-9145