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• W2680333278 abstract "Femoral offset restoration is related to low rates of wear and dislocation. Replication of the native hip anatomy improves prosthesis survival, whereas increasing the femoral offset elevates the torque stresses, thus inducing a risk of suboptimal stem fixation. Although the Corail (DePuy Synthes, St Priest, France) uncemented stem has an excellent record of fixation, an unexpectedly number of aseptic loosenings has been noted in our institution. We sought to characterize the clinical parameters observed in a group of patients who have experienced metaphyseal aseptic loosenings with the collarless version of the Corail uncemented femoral component; describe the radiographic findings in this group of patients; expose the intraoperative findings in the cases that needed revision surgery and to calculate a possible frequency of this complication. We present a series of 15 metaphyseal debondings of the collarless version of the Corail uncemented stem in primary total hip arthroplasty. Eleven men and four woman with an average age of 60 years old (range: 42 to 81 years old) and a previous history of osteoarthritis presented with thigh pain and limping at an average of 33 months postoperative (range: 5 to 100 months). Seven cases presented a Dorr´s classification type A femur and 8 cases a type B femur. In 10 of the 15 cases a 36 mm ceramic on ceramic bearing surface was implanted and in 5 a 28 mm diameter ceramic on polyethylene pair. Radiographic assessment of the failures evidenced an increase in femoral offset of 6.2 mm in average (range: 0 to 17 mm). Nine of the 15 cases had a standard offset stem and 3 an extended offset stem. Leg length discrepancy was in average 2.4 mm (range: 0 to 8 mm). None of the failures presented a more than 2 mm subsidence. Alignment of these stems was in average 2.1 degrees of varus (range: 0 to 5 degrees). Six cases were revised to a long cemented or uncemented stem, 2 cases were lost and 7 cases are awaiting revision surgery. Although the incidence of this complication was low (15 failures in 855 cases in 10 years = 1.75%), we are concerned about the real magnitude of this problem, as this mode of failure was observed up to 8 years after implantation. Enhanced lateralization of the hip, independently of the type of stem, may have played a role in the infrequent early failures of this popular design. Routine use of “fine tunning” preoperative planning in order to avoid offset enhancement is strongly reccommended, as this was the only suspected factor that was present in almost all the failures we observed." @default.
• W2680333278 created "2017-06-30" @default.
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• W2680333278 date "2017-06-01" @default.
• W2680333278 modified "2023-09-27" @default.
• W2680333278 title "METAPHYSEAL DEBONDING OF THE CORAIL COLLARLESS UNCEMENTED STEM: REPORT OF 15 CASES" @default.
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