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Introduction: Hip arthroplasty and revision surgery are growing exponentially in OECD countries. In developing countries, it is an infrequent intervention and its practice is limited. It is exposed to a higher rate of infectious and mechanical failures than in developed countries. The aim of the actual study is to provide a review of the literature on total hip arthroplasty series in sub-Saharan Africa followed by an overview of the interest and perspectives of the use of dual mobility (DM) cups. Materials and methods: Scopus, EMBASE, Medline, PubMed, and Safoonline databases were searched including papers published at any date. The Preferred Reporting Items for Systematic Reviews and Meta-analyses (PRISMA) guidelines were followed. All papers from South Africa were excluded. Results: We identified 22 series of total hip arthroplasty in 14 SSA countries. The practice of total hip arthroplasty is not very widespread. The cups used are mostly conventional implants, and complications (mechanical and infectious) are frequent. Discussion: The interest for the use of dual mobility cups in sub-Saharan Africa can be summarized in two points: mechanical and socio-economical. Dual mobility cups provide more mechanical stability and a reduction in the overall cost of treatment by reducing the rate of complications. These prospects will make it possible to evaluate this medical device in the long term in a hostile environment conductive to complications. Conclusion: The use of dual mobility deserves to be developed in African settings. [ABSTRACT FROM AUTHOR]

There is a scarcity of long-term groundwater hydrographs from sub-Saharan Africa to investigate groundwater sustainability, processes and controls. This paper presents an analysis of 21 hydrographs from semi-arid South Africa. Hydrographs from 1980 to 2000 were converted to standardised groundwater level indices and rationalised into four types (C1–C4) using hierarchical cluster analysis. Mean hydrographs for each type were cross-correlated with standardised precipitation and streamflow indices. Relationships with the El Niño–Southern Oscillation (ENSO) were also investigated. The four hydrograph types show a transition of autocorrelation over increasing timescales and increasingly subdued responses to rainfall. Type C1 strongly relates to rainfall, responding in most years, whereas C4 notably responds to only a single extreme event in 2000 and has limited relationship with rainfall. Types C2, C3 and C4 have stronger statistical relationships with standardised streamflow than standardised rainfall. C3 and C4 changes are significantly (p < 0.05) correlated to the mean wet season ENSO anomaly, indicating a tendency for substantial or minimal recharge to occur during extreme negative and positive ENSO years, respectively. The range of different hydrograph types, sometimes within only a few kilometres of each other, appears to be a result of abstraction interference and cannot be confidently attributed to variations in climate or hydrogeological setting. It is possible that high groundwater abstraction near C3/C4 sites masks frequent small-scale recharge events observed at C1/C2 sites, resulting in extreme events associated with negative ENSO years being more visible in the time series. [ABSTRACT FROM AUTHOR]