Dominic Stone
Skeletal muscle accounts for 40%–45% of total body mass and is necessary for generating forces for movement. While minor tears and bruises can be overcome without intervention, muscle injuries can lead to extensive scarring, fibrous tissue, and loss of function. Muscle strains, or pulled muscles, are a common injury in sports, causing stretching of the muscle fibers and leading to partial or complete tears. These injuries can result from explosive movements in sports or sudden increases in exercise intensity. While most muscle strains heal without surgery, severe injuries may require reconstructive procedures. The body's natural muscle regeneration process involves the presence of diverse cell types, gene expression changes, and growth factors.
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What You'll Learn
Muscle regeneration strategies
Skeletal muscle has the capacity to regenerate after injury. However, this regeneration requires interventional support for large volumes of muscle loss. Muscle regeneration is a complex and well-coordinated process that involves the presence of diverse cell populations, the up and down-regulation of various gene expressions, and the participation of multiple growth factors.
Surgical Techniques
Surgical techniques are used to treat muscle injuries, particularly those that involve a large volume of muscle loss. Whole muscle grafting, for example, involves transplanting a donor muscle onto the underlying muscle of the host animal or human.
Physical Therapy
Physical therapy can be used to support muscle regeneration and improve functional muscle recovery. Mechanical stimulation is one therapeutic alternative that can help in this regard.
Biomaterials
Biomaterials, such as biological scaffolds composed of extracellular matrix (ECM) proteins, are commonly used in regenerative medicine and surgical procedures for tissue reconstruction and regeneration. These scaffolds provide a structural and biochemical framework that promotes the repair of volumetric muscle loss.
Muscular Tissue Engineering
Muscular tissue engineering involves the use of stem cells, growth factors, and biological scaffolds to repair and regenerate muscle tissue. The combination of these elements has shown promising results in animal models, stimulating skeletal muscle repair and promoting myoblast differentiation and fusion to form myofibers.
Cell Therapy
Cell therapy, such as the transplantation of muscle stem cells, is another strategy for muscle regeneration. While this approach holds promise, more research is needed before it can become a standard treatment option. Regulatory T cells (Treg) and macrophagic populations also play a role in muscle regeneration, influencing the inflammatory response and the behaviour of satellite cells.
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Muscle repair techniques
Surgical Techniques
Surgical techniques are required for large volumes of muscle loss. Whole muscle grafting is one such technique, where a cutaneous incision is made, and the muscle is excised from the muscle bed and connective tissue. The excised muscle is then transplanted and sutured over the underlying muscle.
Physical Therapy
Physical therapy, including mechanical conditioning, massage therapy, and physical manipulation of injured skeletal muscles, has been shown to benefit muscle biology and function. Mechanical stimulation, such as ultrasound-guided intra-tissue percutaneous electrolysis (EPI technique), is a promising treatment for muscle injuries.
Biomaterials and Muscular Tissue Engineering
Biomaterials and tissue engineering are also strategies to support muscle repair. For instance, osteopontin, a protein secreted by skeletal muscle cells, is critical for muscle regeneration following injury.
Nutrition and Hydration
Nutrition and hydration are key to supporting muscle repair. Consuming adequate protein and maintaining hydration help repair muscle damage and reduce the risk of injury.
Rest
Allowing for adequate rest and recovery is essential to muscle repair. This gives time for the formation of scar tissue and the regeneration of muscle fibres. Longer immobilisation, however, can have adverse effects, including atrophy of healthy muscle.
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Surgical procedures for muscle repair
Skeletal muscle, which accounts for 40%–45% of the total body mass, has the capacity to regenerate after injury. However, for large volumes of muscle loss, this regeneration requires interventional support. Surgical intervention is generally considered for muscle injuries with 2 or more overlying compartments, such as the muscle quadriceps femoris, or when there is a persisting extension pain for more than 4-6 months in a previously injured muscle.
In cases of extensive muscle loss, such as volumetric muscle loss (VML), biological scaffolds are used as an augmentation to modify the tissue repair mechanism and promote the synthesis of more muscle tissue. There are several commercially available scaffold brands derived from swine and bovine tissue. Cell-based therapy with scaffolds has been shown to enhance functional recovery.
Additionally, debridement, a specific surgical technique, is employed to remove damaged, loose, or necrotic tissue from the injured area, aiding in better healing. Haematoma drainage and fasciotomy may also be necessary when symptomatic nerve and/or vascular compression is detected.
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Physical therapy for muscle recovery
Physical therapy is an important component of the recovery process for people dealing with medical conditions, injuries, or surgeries. It can be used to treat conditions like rotator cuff tears or meniscal injuries in the knee, helping to strengthen supporting muscles and improve range of motion. Physical therapy can also be useful in preparing patients for surgery, both mentally and physically. Therapists employ modalities like heat or cold therapy, massage, and stretching to help loosen tight muscles, reducing pain and stiffness.
There is no one-size-fits-all approach to muscle recovery. However, physical therapists can help patients develop a personalized recovery plan that will help them perform at their best. For example, physical therapists can teach patients pain management strategies, such as relaxation techniques or breathing exercises, to help them better cope with their pain. These strategies enable patients to regain control over their pain levels and improve their overall mental and emotional well-being.
To promote muscle repair and regeneration, different strategies have been developed, including surgical techniques, physical therapy, biomaterials, and muscular tissue engineering as well as cell therapy. Physical therapy can be instrumental in mitigating pain during the recovery process, allowing patients to gain the strength and confidence they need to reintegrate into their daily activities. By focusing on specific exercises and techniques tailored to the patient's needs, physical therapists can help build muscle strength and flexibility, improve range of motion, and reduce pain and discomfort.
Additionally, physical therapy can help address underlying imbalances and weaknesses in the body, helping to alleviate pain, improve mobility, and restore function, thereby reducing the need for surgery. It can also be a valuable tool in avoiding surgery and promoting optimal health and function for those dealing with medical conditions or injuries. One of the primary goals of physical therapy is to help patients build strength and flexibility in the areas most vulnerable to injury, such as the back, hips, knees, and ankles.
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Cell therapy for muscle regeneration
Skeletal muscle is one of the most abundant tissues in the human body, accounting for 40%–45% of total body mass. It has a certain threshold up to which it can regenerate lost tissue upon injury. However, in cases of large volumes of muscle loss, this regeneration requires interventional support.
Cell therapy has emerged as a promising strategy for skeletal muscle repair and regeneration. The regenerative capacity of skeletal muscle tissue is based on stem cells and their ability to self-renew and differentiate into new muscle tissue. Satellite cells, a rare population of muscle-specific progenitor cells, play a central role in muscle maintenance and regeneration. Under normal conditions, these cells remain quiescent, but upon injury, they become activated, enter the cell cycle, and generate proliferating myoblasts.
Recent pre-clinical and clinical data suggest that cell therapy may provide a viable treatment option for skeletal muscle injuries. In vivo studies have shown that MuSCs (muscle stem cells) can be isolated and transplanted into donor muscle, resulting in robust engraftment and improved muscle function in mouse models of Duchenne muscular dystrophy and sarcopenia. While early-phase clinical trials in patients with Duchenne muscular dystrophy did not show significant strength recovery, advancements in understanding cell behaviour and mechanistic bases have led to new paradigms in cell therapies.
To enhance the regenerative capacity of cells, physical, chemical, and signalling cues can be presented through biomaterials. For instance, co-culturing CD3 + T-cells with MuSCs has been found to facilitate the large-scale expansion of MuSCs. Additionally, natural and synthetic materials such as fibrin, alginate, and polycaprolactone-based polymers can be used as scaffolds to generate skeletal muscle tissues in vitro.
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Frequently asked questions
Yes, skeletal muscle has the capacity to regenerate after injury. However, this is only possible up to a certain threshold. Large volumes of muscle loss will require interventional support.
Large volumes of muscle loss can lead to extensive scarring, fibrous tissue, and loss of muscle function. This is known as "volumetric muscle loss" (VML) and can substantially impact a patient's quality of life.
VML is often caused by high-energy traffic accidents, blast trauma, combat injuries, or sports injuries. Surgical and orthopedic situations can also lead to VML, such as compartment syndrome or tumor resection.
Treatments for muscle loss include surgical techniques, physical therapy, biomaterials, and muscular tissue engineering. Stem cell therapy has also shown promising results in animal models.
To prevent muscle loss, it is important to avoid activities that cause pain and further injury to the muscle. Giving adequate time for the muscle to heal is crucial, as returning too soon can lead to re-injury.
