zauberflöte
alpha
- Joined
- Mar 8, 2013
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- 72
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@TomT I thought I'd move the dual mobility stuff over to your thread if that's ok with you? I was up until 1:30 last night looking up mobility of hip implants!!! I looked up the Dual Mobility and it's a cool concept but I couldn't tell if it provided more absolute ROM than a traditional single cup, so I started down that rabbit hole willingly. I learned WAY more than I ever dreamed was known about the ins and outs of implants and how they fit us. Being as it was so late, I know I don't remember correctly, but in one article, a team of surgeons created a bunch of computer modelings of various human acetabular shape possibilities and then, still in the model, stuck various cups and various balls on various angles of stems and measured the ROMs of each possibility thirteen ways from Thursday. They measured to "component impingement" and also to "bone/tissue impingement". It was a fascinating read. Either that writeup or the other one I read said that in the end it was all up to human anatomy and the skill of the OS anyway. So!
So now that has me all thinking about my vastly different cups (and probably the balls are different sizes too, can't put my hands on my last xray). One cup is a fairly perfect hemisphere, and the other (in xray anyway) appears to have an inward lip on it, like a beret or tam, sort of. When I saw the image, I asked him if that was going to change anything in mobility and whatnot, and he said no.
They feel very different when I'm asking extremes of them, different things hurt on each, but it feels like soft tissue difference. I can't really do passive ROM tests on myself so don't know if there's a significant difference. I have never been flexible, so I assume my limitations are the same old "this won't do that!" that they were 50 years ago... only 50 years more so.
But I love Shugaplum's story in the Amazing Hip Recoveries. She was at the time in her early 20's, a ballet dancer and teacher, and very flexible, as they all are. Her 5-month "after" photo shows her nearly back to pre-pain ROM already, and as we know, ballet asks extreme extremes. So.... if I were 25, I really expect that these hips I have now would do for me exactly what my natural ones did.
It appeared to me that the Dual Mobility simply provides an extra layer of longevity, as the little inside cup is the one you'd be using most of the time. The advantage may not be ROM, it may be durability. I dunno! I hope I haven't bored you to tears!!!!
So now that has me all thinking about my vastly different cups (and probably the balls are different sizes too, can't put my hands on my last xray). One cup is a fairly perfect hemisphere, and the other (in xray anyway) appears to have an inward lip on it, like a beret or tam, sort of. When I saw the image, I asked him if that was going to change anything in mobility and whatnot, and he said no.
They feel very different when I'm asking extremes of them, different things hurt on each, but it feels like soft tissue difference. I can't really do passive ROM tests on myself so don't know if there's a significant difference. I have never been flexible, so I assume my limitations are the same old "this won't do that!" that they were 50 years ago... only 50 years more so.
But I love Shugaplum's story in the Amazing Hip Recoveries. She was at the time in her early 20's, a ballet dancer and teacher, and very flexible, as they all are. Her 5-month "after" photo shows her nearly back to pre-pain ROM already, and as we know, ballet asks extreme extremes. So.... if I were 25, I really expect that these hips I have now would do for me exactly what my natural ones did.
It appeared to me that the Dual Mobility simply provides an extra layer of longevity, as the little inside cup is the one you'd be using most of the time. The advantage may not be ROM, it may be durability. I dunno! I hope I haven't bored you to tears!!!!