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Medical AI Inquiry: You was designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.  Labels: BACKGROUND, OBJECTIVE, METHODS, RESULTS. Meshes: Angiogenesis Inducing Agents, Animals, Compartment Syndromes, Debridement, Disease Models, Animal, Fracture Healing, Male, Muscle Fibers, Skeletal, Muscle Strength, Muscle, Skeletal, Osteogenesis, Distraction, Osteotomy, Rabbits, Recovery of Function, Regeneration, Tibia, Tibial Fractures, Time Factors, Vascular Endothelial Growth Factor A.
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Does vEGF improve skeletal muscle regeneration after acute trauma and reconstruction of the limb in a rabbit model? Context: Complicated tibial fractures with severe soft tissue trauma are challenging to treat. Frequently associated acute compartment syndrome can result in scarring of muscles with impaired function. Several studies have shown a relationship between angiogenesis and more effective muscle regeneration. Vascular endothelial growth factor (VEGF) is associated with angiogenesis but it is not clear whether it would restore muscle force, reduce scarring, and aid in muscle regeneration after acute musculoskeletal trauma. Therefore, we asked whether local application of VEGF (1) restores muscle force, (2) reduces scar tissue formation, and (3) regenerates muscle tissue. We generated acute soft tissue trauma with increased compartment pressure in 22 rabbits and shortened the limbs to simulate fracture débridement. In the test group (n = 11), a VEGF-coated collagen matrix was applied locally around the osteotomy site. After 10 days of limb shortening, gradual distraction of 0.5 mm per 12 hours was performed to restore the original length. Muscle force was measured before trauma and on every fifth day after trauma. Forty days after shortening we euthanized the animals and histologically determined the percentage of connective and muscle tissue. Recovery of preinjury muscle strength was greater in the VEGF group (2.4 N; 73%) when compared with the control (1.8 N; 53%) with less connective and more muscle tissue in the VEGF group. The recovery of force was related to the percentage of connective tissue versus muscle fibers.
assistant
Local application of VEGF may improve restoration of muscle force by reducing connective tissue and increasing the relative amount of muscle fibers. Final Decision: yes