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(2°) and distances (1 mm), 60 has been used to plan THAs with stems featuring modular neck designs. However, these components have been proven to perform poorly in a number of material and design combinations. 61 , 62 Studies so far have
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months. Aseptic loosening rates for short-stemmed THA are double compared with conventional stems at ten years (2.7% compared with 1.3%). However, revision rates vary according to the type of implant. Femoral stems with modular necks show a double
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THA initially concerned raised blood cobalt and chromium ions, 27 loosening of components, 28 soft-tissue reactions around the hip 29 and osteolysis. 30 Wear at the ball and socket interface as well as modularity at the head—neck
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transfemoral approach utilizing a non-modular stem and chisel perforation for all limbs of the osteotomy; however, this technique had high rates of stem subsidence and nonunion. Fink et al 32 reported higher rates of union using an osteotomy technique that
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acetabular shell, the dual mobility cup (DMC) combines Charnley’s low-friction principle with the McKee–Farrar concept of an increased femoral head-to-neck ratio to maximize stability. 4 , 5 Despite promising results in reducing instability in France
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decreases head-neck taper corrosion Ceramic is known for its inert and electrically insulating properties. In an in vitro study analysing fretting corrosion between zirconia ceramic heads and cobalt-alloy stems compared with metal (cobalt-alloy) heads
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femur. These were universally managed with cabling and restricted weight bearing post-operatively. In all cases, a standard, non-modular, stem was used. Eight of the hips demonstrated evidence of osteolysis secondary to polyethylene wear. This mainly
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–82) 20 30 Not reported Uncemented Not reported SPS family (Symbios) including 36 stems with modular neck (50 hips) Huo et al . (19) 59 53 57.4 (27–79) 29 24 DDH: 16; Primary OA: 16; Osteonecrosis: 16; Ankylosing spondylitis: 9
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dislocation. Factors that decrease the head-to-neck ratio will increase the risk for dislocation. There are theoretical advantages in using larger head sizes with regard to stability. The improved head-to-neck ratio reduces component impingement and
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provides an overview of the hip–spine relationship and its implications for patients undergoing total hip arthroplasty (THA). A crucial step in THA is to position the cup in such a way to obtain a stable joint without neck-cup impingement or edge loading
