Department of Orthopaedics, Institute of Clinical Sciences, Sahlgrenska Academy, University of Gothenburg, Sweden
Swedish Hip Arthroplasty Register, Gothenburg, Sweden
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Department of Orthopaedics, Institute of Clinical Sciences, Sahlgrenska Academy, University of Gothenburg, Sweden
Swedish Hip Arthroplasty Register, Gothenburg, Sweden
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Swedish Hip Arthroplasty Register, Gothenburg, Sweden
Department of Orthopaedics, Prince Philip Hospital, HDUHB, Wales
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Finnish Arthroplasty Register, Helsinki, Finland
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Department of Orthopaedics, Institute of Clinical Sciences, Sahlgrenska Academy, University of Gothenburg, Sweden
Swedish Hip Arthroplasty Register, Gothenburg, Sweden
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Department of Orthopaedics, Institute of Clinical Sciences, Sahlgrenska Academy, University of Gothenburg, Sweden
Swedish Hip Arthroplasty Register, Gothenburg, Sweden
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Introduction Total hip arthroplasty (THA) currently comprises a variety of head sizes and bearing types. The size of femoral head used in THA gradually increased from 22 mm in the 1960s to 28 mm in the 1990s, and thereafter to 32 mm in the mid
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. It describes forms of isolated femoral head fractures (infrafoveal fragment Type I or Type II – suprafoveal) or associated with a posterior wall fracture (Type III) or with a femoral neck fracture (Type IV) ( 10 , 11 ). However, the size of the
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system provides a greater effective head size and improved head-to-neck ratio ( Fig. 5 ). Dual mobility is therefore expected to improve the ROM to impingement and joint stability. Laboratory studies have confirmed this assumption and have emphasised the
Region Västra Götaland, Sahlgrenska University Hospital, Department of Orthopaedics, Gothenburg, Sweden
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Department of Orthopaedic Surgery and Traumatology, Odense University Hospital, Odense, Denmark
Institute of Clinical Research, University of Southern Denmark, Odense, Denmark
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Region Västra Götaland, Sahlgrenska University Hospital, Department of Orthopaedics, Gothenburg, Sweden
The Swedish Hip Arthroplasty Register, Gothenburg, Sweden
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standard in many countries. 4 Introduction of metal-on-metal articulations, ceramic-on-ceramic and, above all later on, highly cross-linked polyethylene opened the possibility for the use of bigger head sizes, but recent studies have suggested limited
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sizing can mitigate the risk of symptomatic overhang when reducing the anteversion, whereas the risk of posterior impingement can be minimized by using a bigger head. Sub-hemipherical cups may reduce protrusion of the component and increase joint ROM, but
Division of Orthopaedics and Trauma Surgery, Cantonal Hospital Winterthur, Winterthur, Switzerland
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Faculty of Medicine, University of Berne, Berne, Switzerland
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stainless steel due to wear issues and finally in 1974 by aluminium oxide ceramic heads ( 17 , 19 ). Nevertheless, no long-term advantages could be shown regarding the rotating neck ( 20 ). However, as the head sizes of 32 mm were innovative at that time
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polyethylene (PE), metal-on-metal (MoM) hard-on-hard articulations started to become popular to enable larger head sizes. Opposite to PE bearings, the amount of wear in MoM bearings decreases with head size – as long as they are lubricated properly. This was
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even when selecting a XLPE liner, but in standard routine cases no more than 36 mm is suggested according to the acetabular component size for safety reasons, as there is a lack of information for head sizes larger than 36 mm. The thickness of XLPE
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well-functioning, unrevised implants. In addition, among the implants in a given study, there is often heterogeneity in the bearing surfaces used, head size, offset, stem type, stem alloy and implant manufacturer which may have implications on taper
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first line’, representing an increased vascularity in granulation tissues. ( Fig. 3 ). The issue of the imaging evaluation concerns the integrity of the femoral head, the size of the lesion, the presence of a depression of the femoral head or an
