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
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. Reverse Hill Sachs lesions > 25% of the humeral head articular surface in size are often unstable after closed reduction and they also require surgical intervention. Open reduction and surgical stabilization are indicated in such cases with defects 25% to
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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determine the critical size of a defect which needs to be treated. This was the very beginning of our serial studies of shoulder stability related to the glenoid and humeral head defects. We created anteroinferior glenoid bony defects of four different sizes
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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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suggestion that a partial radial head fracture must be of sufficient size (at least 30% of the articular surface) and displacement (at least 2 mm) to be considered a displaced fracture (Mason type II, as opposed to nondisplaced Mason type I) ( 15 ). Despite
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radiographs of the pelvis reveal all the information needed to determine which additional radiographic assessment is necessary. The radiograph should be systematically reviewed on the representation of the femoral heads in size and location, a symmetrical
