A group of researchers from MIT have created a new type of amputation surgery that will help amputees gain better control of their skeletal muscles and sense where their “phantom arm” is in space. In most cases, amputees usually have muscle pairs that control the affected joints. The team of researchers has now discovered that reconnecting these muscle pairs and allowing them to maintain their normal pull-out relationship, offers much greater sensory feedback. better for people.
15 patients were examined
As part of the study, 15 patients who received this new type of surgery were able to control their muscles more closely. Named as a myoneural agonist-antagonist interface, the surgery helped the patients feel more freedom of movement and less pain in the affected limb. Shriya Srinivasan, MIT postdoc and lead author of the study, said the study shows that the best patients can flex their muscles. Other authors of the study include Samantha Gutierrez-Arango and Erica Israel, senior research support associates at Media Lab; Ashley Chia-En Teng, MIT undergraduate; Hyungeun Song, a graduate student in the Harvard-MIT Program in Health Sciences and Technology; Zachary Bailey, former visiting researcher at Media Lab; Matthew Carty, visiting scientist at Media Lab; and Lisa Freed, Media Lab research scientist.
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During normal limb rotation, the muscles that control limb movement are restricted. This cuts back sensory feedback and makes it much harder for amputees to feel where their prosthetic organs are in space. Srinivasan, who was a member of the Biomechatronics group is now on one muscle contract, the other has no antagonist activity. Even with modern prostheses, people always see the prosthesis.
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The researchers also found that AMI patients reported less pain and a greater sense of freedom of movement in their amputated limbs. They developed a modified version of the surgery that can be performed on people who already have a traditional fracture. Known as “regenerative AMI”, this process involves grafting small sections of muscle to become a muscle agonist and antagonist for an amputated joint. The researchers are also working on developing an AMI method for other types of fuel.
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