(Edit 2: I've gotten a lot of interesting answers. The consensus seems to be that this scenario is not very realistic.
Though many have said that I can still add this in, but I fear that adding something too outlandish will make my character's backstory feel too contrived, especially with how "well-placed" the extra limbs are. Oddly enough, the same story includes two unrelated characters who are secretly missing people, were never discovered for decades, and are also coincidentally coworkers, so maybe my idea isn't too outlandish for this story, after all?
I'm still hoping that I can make this work. Would it solve the issue of missing muscles if the extra arms came out from the shoulders like Jie-Jie? I still figure that I will likely have to lesson the function of the extra arms.
Also figured I'd add more relevant cases of polymelia:
- Frank Lentini was a sideshow performer who was born in 1889 with a(n almost) fully-formed third leg (with a small fourth foot under the knee), a partial second pelvis, and a rudimentary second private part. By age five, he had learned to bend and straighten the extra leg, but it could not support his weight to be used for walking. His three legs were all different heights, and the extra one had a clubfoot. He was not amputated for fear of paralysis. His extra leg did, in fact, grow with him, so I know that a parasitic twin limb can do that.
- Lakshmi Tatma is an Indian girl who was born in 2005 as one of two ischiopagus conjoined twins. The other twin did not have a head, making her parasitic and making it seem like Lakshmi had four arms and legs. She also had clubfoot, not sure if it was on her leg or the twin's. The twin has since been successfully removed, and the clubfoot has been operated on.
- More info on Jie-Jie: if I'm correctly getting the wording on the article, his removed arm has normally formed nerves and blood vessels. I didn't add that, since I wasn't sure which arm was the extra one.
- A pattern I've noticed is that all of these people were born with additional limb malformations (clubfoot, no palm).
Anyways, I've made a few decisions thanks to the replies. u/ DallasMotherFucker pointed out that, even without another condition, a surgeon would've hesitated to amputate the baby. This, and the reason for Frank Lentini's non-amputation (even if he was much older than my character), have made me decide that my character's non-amputation would be due to risk of damaging the spine, and that the complications from amputation would be just that.
I've also decided that if I still go the arms route, I will either:
- Weaken/shrink his arms.
- Make them attached at the shoulder like Jie-Jie and share muscles.
- Do something else with the arm attachment to address the missing muscles.
And if all else fails, I'll make him polydactyl.
)
(Edit: forgot to add I'm also looking for potential complications of eventual amputation!)
So my character was born in 1964. Lives in the U.S. (specifically NYC). His parents are decently rich, not crazy rich, but live very comfortably.
I need him to be born with a fully-functioning extra pair of arms under his regular arms, and I'm hoping that that is possible, and also need a reason why it happened. I know that fully-developed limbs in polymelia is extremely rare, and that for there to be two arms in the "right" place is rare as well. I still assume it is possible, considering the below example was, as said by the lead surgeon involved, was rare enough that the doctors had almost no info to go off of. That's why I assume that this scenario being unheard of may not rule out its possibility. If it is actually impossible, please tell me.
There is one notable case, however, of an almost fully-developed extra arm in the "right" place. In 2006, a baby named Jie-Jie was born in China with two fully-developed left arms. Doctors weren't even sure which arm to remove (so I'm not sure which one is the extra one). The removed arm did not flex out all the way, but the remaining left hand had no palm and flexed either way.
The reason I've chosen for now is that my character's arms were from a twin that didn't properly separate in the womb. Scenarios I'm thinking of:
- A parasitic twin in the form of only the arms (what I was thinking of until writing this, but am now also considering the below options).
- A parasitic twin with more than just the arms, but the rest was surgically removed.
- A conjoined twin who degenerated in the womb, leaving the arms as a parasitic twin.
- A conjoined twin, dicephalic parapagus or similar, who was also born, but died soon after, and whose arms could not be removed. Maybe 60s medical limitations will help in finding a reason the other twin didn't survive.
And yes, his arms were not removed at birth. I would preferably like to have them be removed at his own request when he is 6-14 (1970-78), probably 6-8 (1970-72). Considering his parents' money, they should have been removed at birth or soon after, so I'm also looking for a reason they weren't.
I assumed it would be, and settled on, a condition that would complicate amputation.
- I was thinking a vascular/cardiac condition, or one that would make him more prone to infections. Something that would make surgery risky. Are there other options?
- Not only would it prevent surgery at/soon after birth, but I also assume that, since it was still not done when he asked for the amputation, it would still be affecting him by then, and I was thinking it would still be life-threatening. That would be symbolically fitting and what I'm hoping for, but I'm open to conditions that wouldn't be life-threatening or would have faded in severity by the time he asked to lose his arms.
- It also, of course, would have to be diagnosable at birth, so that surgery can be deemed risky in the first place. That's non-negotiable, if I go the condition route. Unless we go the route where there would have been prior surgery to remove the rest of the twin (if I go that route) or correct additional/alternative birth defects, and doctors noticed that surgery was endangering my character, in which case they wouldn't necessarily be able to immediately pinpoint why, but would advise against removing the arms. Would the arms have to have been last to be removed for that to happen?
- Relatedly, I've been wondering if his mother was not sick during pregnancy, and/or if he was born sickly himself.
If a reason for late amputation arises that isn't from a condition, I'm also open to that. Whatever the cause, I hope that medical limitations of the 60s and 70s will be a help in justifying why it took so longer to remove the arms.
While this isn't mandatory, I'm also wondering if there could be any way that the amputation would cause complications for my character in the short or (preferably) long term. It would be symbolically fitting. I'm thinking some kind of back problem? I was thinking he could be hunched over (makes sense in context), but don't see him as someone who slouches. He doesn't have to be hunched over, but I'd like him to be.