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Despite the excellent success rates of modern implants, unicompartmental knee arthroplasty (UKA) continues to show relatively high failure and revision rates, especially when compared with total knee arthroplasty (TKA).
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These higher rates of failure and revision are mainly observed during the early (< 5 years) post-operative period and are often due to incorrect indications and/or surgical errors.
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The correct clinical and radiological indications for UKA have therefore been analysed and correlated as far as possible with the principal mechanisms and timing of failures of UKA.
Cite this article: EFORT Open Rev 2018;3:442-448. DOI: 10.1302/2058-5241.3.170060
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diagnostic modalities, and briefly discuss treatment. Causes were ordered based on probability. Results Progression of osteoarthritis Lateral progression of osteoarthritis is the most common reason for revision after UKA, with an overall incidence
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stump and fixed with anterograde Kirschner wires. 63 Of the hips, 93% presented with no progression of osteoarthritis, good clinical scores and no subsequent total hip arthroplasty (THA) at 10-year follow-up 64 following a modified Dunn
Clínica Alemana-Universidad del Desarrollo, Santiago, Chile
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Hospital Padre Hurtado, Santiago, Chile
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3Bs Research Group – Biomaterials, Biodegradables and Biomimetics, University of Minho, Portugal; ICVS/3Bs–PT Government Associate Laboratory, Portugal
Orthopaedics Department of Minho University, Portugal
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with clinical or other radiological outcomes. They concluded that there is some evidence to support the hypothesis that meniscal allograft transplantation reduces the progression of osteoarthritis, although it is unlikely to be as effective as the
Sengkang General Hospital, Singapore
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bind to receptors on chondrocytes to promote synthesis of matrix metalloproteinases which then break down cartilage leading to progression of osteoarthritis, which is characterized by the cardinal features of narrowed joint space, osteophytosis
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( Fig. 3 ). The loss of mineralisation and increased bone volume lowers the tissue stiffness (Young’s modulus) but increases the structural stiffness. Fig. 2. Proposed scheme for the development of bone marrow lesions and progression of
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. report a good outcome 6 years after conservative treatment (without restriction of activity) of OLT with a decrease of VAS pain score from 3.8 to 0.9 and no progression of osteoarthritis ( 14 ). Injective treatments have been introduced. Infiltration of
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of osteoarthritis. 30 Nevertheless, the incidence of infection in cases of failure for UKA should force us to consider it as a diagnosis option. Epinette et al describe it as the cause of 1.9% of failures 31 and Sierra et al as 3%. 30
Life and Health Sciences Research Institute (ICVS), School of Medicine, University of Minho, Portugal
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Life and Health Sciences Research Institute (ICVS), School of Medicine, University of Minho, Portugal
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: current status and future perspectives . Clin Orthop Relat Res 2009 ; 467 : 616 – 622 . 3. Bardakos NV Villar RN . Predictors of progression of osteoarthritis in femoroacetabular impingement: a radiological study with a
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AM Bierma-Zeinstra SM . Body mass index associated with onset and progression of osteoarthritis of the knee but not of the hip: the Rotterdam Study . Annals of the Rheumatic Diseases 2007 66 158 – 162 . ( https://doi.org/10.1136/ard.2006
