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Muscle transplantation is a procedure that has been used to treat muscle damage caused by injury or disease. It involves the transposition and transplantation of whole muscles, with the transplanted muscle connected to an artery, vein, and nerve in its new location to restore function. This technique has been used to restore basic arm or hand function in patients with paralyzing injuries, and recent developments in tissue engineering and vascularization have improved the success of muscle transplants.
| Characteristics | Values |
|---|---|
| Muscle Transplant Possible? | Yes |
| Transplanted Muscle Functionality | Sufficient force and power to maintain posture, move limbs, sustain the patency of sphincters, partially restore symmetry in the face, or serve as, or drive, assist devices in parallel or in series with the heart |
| Transplanted Muscle Recovery Time | The muscle will take some time to begin functioning. Axons must grow 1mm per day until they reach the muscle and cause it to contract |
| Muscle Transplant Applications | Used to treat muscles damaged by injury or disease, or to restore basic arm or hand function to patients who have suffered a paralyzing injury |
| Muscle Transplant Techniques | Microneurovascular repair, engineered tissue grafts, implanted biological scaffold made of extracellular matrix (ECM) from pigs |
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What You'll Learn
- Muscle transplants can be used to restore basic arm or hand function
- Muscle transplants can be used to treat muscle loss from injury or disease
- Muscle transplants can be used to treat paralysis
- Genetically engineered human muscle transplants can enhance neovascularization and myogenesis
- Muscle transplants can be used to treat volumetric muscle loss
Muscle transplants can be used to restore basic arm or hand function
The technique of reversing paralysis through muscle transplants has been used for many decades, but since the 1970s, the development of microneurovascular repair techniques has allowed for whole skeletal muscle transplantation. This involves the transposition and transplantation of whole muscles to treat muscles damaged by injury or disease.
In terms of specific examples, Chuang and associates reported on 38 cases of brachial plexus injury treated with free-functioning gracilis muscle transfer for elbow flexion. In patients with marked overpull of the posterior tibial muscle, transfer of the posterior tibial tendon to the dorsum of the foot combined with other tenotomies or tendon lengthening has been found to give better results than posterior tibial tendon lengthening alone.
In addition to traditional muscle transplants, researchers have also been experimenting with implanted biological scaffolds made of extracellular matrix (ECM) from pigs to coax a person's own stem cells into becoming muscle cells. This technique has been used to treat people who have lost large amounts of muscle from traumatic accidents or military wounds.
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Muscle transplants can be used to treat muscle loss from injury or disease
Muscle transplants are a viable treatment for muscle loss resulting from injury or disease. This procedure, known as free functional muscle transplantation (FFMT), involves transplanting a muscle from one part of the body to another to restore movement. For example, the gracilis muscle from the inner thigh can be transplanted to restore basic arm or hand function in patients who have suffered paralysing injuries.
The concept of muscle transplants is not new, but the development of microneurovascular repair techniques since the 1970s has significantly improved their effectiveness. FFMT is particularly useful in cases where there is no locally available or ideal musculotendinous donor unit. It has been successfully applied in various clinical cases, including brachial plexus palsy, facial palsy, severe Volkmann's ischemia, and severe crushing and traction injuries of the forearm or arm with major muscle loss.
Following a muscle transplant procedure, the patient must remain in the hospital for several days to ensure the vessels supplying the new muscle remain open and functioning. Once the muscle "takes," it will take additional time for it to begin functioning. A nerve is sutured to the nerve controlling the transplanted muscle, and axons must grow from the repair site at a rate of about 1 mm per day until they reach the muscle and cause it to contract.
Transposed and transplanted muscles can develop sufficient force and power to perform various functions, such as maintaining posture, moving limbs, sustaining the patency of sphincters, partially restoring facial symmetry, and assisting devices working in conjunction with the heart. However, there are some deficits associated with muscle transplants, particularly during the first month. These deficits include a decrease in muscle mass and maximum force, which gradually improve, stabilising between 90 and 120 days post-transplant.
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Muscle transplants can be used to treat paralysis
During the procedure, the transplanted muscle must be connected to an artery and a vein in its new location to keep it alive. It must then be connected to a healthy nerve so that it can be used to move the limb. The nerve is sutured to the nerve that controls the transplanted muscle, and the axons must grow from the repair site at a rate of 1mm per day until they reach the muscle and cause it to contract. The patient must remain in the hospital for several days after the procedure to ensure that the vessels to the new muscle continue to flow effectively.
Reinnervated free muscle transplantation has been used to rehabilitate severely impaired extremities in patients with brachial plexus palsy and for functional limb salvage in cases of traumatic muscle loss or radical excision of malignant soft-tissue tumours. In one study, 46 patients received 58 reinnervated free muscle transplantations, with all muscles surviving. The speed and extent of reinnervation of the transplanted muscle depended on the choice of recipient nerve, the patient's age, and the occurrence of postoperative vascular complications.
Microneurovascular muscle transplantation is typically a technique of last resort for unilateral dynamic facial reanimation. However, for congenital and bilateral facial paralysis, these procedures offer patients rehabilitation options that may not otherwise be possible. In 1997, Terzis and colleagues reported on the outcome of 100 free-muscle transplants for facial paralysis, finding that 94% of patients showed a higher postoperative rating, and 80% achieved a moderate or better result.
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Genetically engineered human muscle transplants can enhance neovascularization and myogenesis
Muscle transplants are indeed possible and have been performed for decades to treat muscles damaged by injury or disease. The procedure involves transplanting a whole muscle to another part of the body, which must be connected to an artery and vein to keep it alive and to a nerve to enable movement.
Recent research has shown that genetically engineered human muscle transplants can enhance neovascularization and myogenesis in mouse hosts. The transplants consist of human myoblasts, genetically modified endothelial cells secreting angiopoietin 1 (ANGPT1), and genetically modified smooth muscle cells secreting vascular endothelial growth factor (VEGF). The genetically modified vascular cells have been cleared for clinical trials and can be used to construct autologous vascularized tissues.
Neovascularization is a fundamental aspect of tissue engineering, particularly when constructing thick tissues such as skeletal muscle. By genetically engineering smooth muscle cells to secrete VEGF, the transplants showed improved neovascularization compared to non-secreting controls. This is important as vascularization is essential for maintaining the viability of the implant following transplantation.
Myogenesis was also enhanced in the presence of the genetically modified cells. VEGF administration has been shown to induce muscle regeneration, and the enhanced VEGF secretion from the graft promoted myogenesis. Gene therapy techniques were applied to optimize and accelerate the implantation process and increase the clinical relevance of the isolated cells.
In summary, genetically engineered human muscle transplants have shown enhanced neovascularization and myogenesis in mouse models, with the potential to be used in clinical trials for surgical reconstructions. This approach could address the growing need for tissues and organs in reconstructive surgery, providing an alternative to the current gold standard treatment of autologous flaps, which has limitations in anatomical availability and donor site morbidity.
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Muscle transplants can be used to treat volumetric muscle loss
Muscle transplants are a viable treatment option for volumetric muscle loss. The procedure involves taking an "expendable" muscle and transplanting it to another part of the body to restore movement. For example, the gracilis muscle from the inside of the thigh can be transplanted to replace the bicep in the arm. This procedure can be used to treat patients who have suffered a paralyzing injury and are unable to undergo primary nerve repair.
The transplanted muscle must be connected to an artery and vein in its new location to keep it alive and functioning. Once the muscle is transplanted, it will take some time for it to begin functioning. A nerve is sutured to the nerve that controls the transplanted muscle, and the axons must grow from the repair site at a rate of about 1 mm per day until they reach the muscle and cause it to contract.
Muscle transplants have been used to treat a range of conditions, including brachial plexus palsy, facial palsy, severe Volkmann's ischemia, and severe crushing and traction injuries of the forearm or arm with major muscle loss. The development of microneurovascular repair techniques has improved the success rate of muscle transplants.
In addition to muscle transplants, other treatments for volumetric muscle loss include tendon transfer, nerve transfer, nerve graft, and nerve release. The specific treatment chosen will depend on which techniques offer the best chance of recovery for the patient's condition.
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Frequently asked questions
Yes, muscle transplants are possible and have been performed for decades.
A muscle transplant involves the transplantation of whole muscles to treat muscles damaged by injury or disease.
The transplanted muscle must be connected to an artery and vein to keep it alive and then to a nerve so that it can be used to move the limb.
Muscle transplants can be used to restore basic function to limbs that have been paralysed, even many years after the initial injury.
