Additionally, 17% of the Magnum hips needed unplanned stem revisions because of the difficulties experienced during head removal. However, the authors experienced difficulties in 29% of the M2a-Magnum revisions and had to use special tools to extract the heads. The authors did not experience difficulties removing any of the M2a-38 heads. The authors then compared the results of the M2a-Magnum group to the M2a-38 group. The authors also measured operation time, blood loss, infection, bone fractures, and any health complications after revision surgery. The authors of this study measured the difficulty of removing the femoral head based on how many special tools they had to use. Additionally, all patients had Biomet-brand stems. 70 of them were M2a-Magnum heads, and 54 of them were M2a-38 heads. This study looks at 124 MoM THA implants that underwent revision surgery. This makes it very difficult to remove the head during revision. However, with the Biomet M2a Magnum device, there is so much grinding and corrosion that occurs between the head and the titanium adapter that the two can get stuck together. Usually, during revision surgery, it is not necessary to remove the stem, and the modular head can be removed easily by using a punch and a mallet. Another Biomet device, the M2a-38, is similar to the M2a-Magnum, but one key difference is that it does not have a separate titanium taper like the M2a-Magnum. One common MoM device is the Biomet M2a-Magnum, which is made up of several components: a cup, a femoral head, a titanium taper adapter, and a stem. Although the use of MoM THAs has gone down, many people still have them and will require revisions in the future, so it is important to understand what might happen during revision. Revisions occur because of pseudotumors (which are enlarged masses of tissue that resemble tumors), dislocations, bone fractures around the implant, and infections. The survival rate of large-diameter MoM THA implants can be as low as 51% after 6 years. MoM THAs often fail and require revision surgery. In response to their second question, the authors found that difficult revisions did result in longer operative times, more bleeding, and a higher risk of bone fracture and joint infection after surgery. In response to their first question, the authors found that, yes, Biomet M2a-Magnum implants are more difficult to revise than Biomet M2a-38 devices. First, are Biomet M2a-Magnum implants more difficult to revise than the Biomet M2a-38? Second, in cases where the M2a-Magnum was harder to revise because of problems with the modular head, were there more surgical complications (such as operative time, bleeding, a risk of fracture, or joint infection)? The authors of this study wanted to answer two questions. This study analyzes the results of 124 Metal-on-Metal THA revision surgeries, all of them involving Biomet devices. These difficulties have been reported to the FDA, but the frequency and complications of these difficulties are unknown. The authors of this study have had a lot of difficulties removing the titanium sleeve adapter in the Biomet M2a Magnum hips. This happens frequently in implant devices that have a titanium sleeve between the head and stem. However, it can actually be incredibly difficult – sometimes impossible – to remove because it can get welded to other components over time. One common component is the modular head it is supposed to be easy to remove during revision surgery. Metal-on-Metal total hip arthroplasty (MoM THA) implants are made up of a variety of components. Title: Modular to Monoblock: Difficulties of Detaching the M2a-Magnum Head Are Common in Metal-on-metal Revisions Abstract
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