In which condition do muscles gradually degenerate with fat and fibrous tissue replacing them?

Muscular dystrophy is a group of inherited disorders characterized by progressive muscle degeneration and weakness. In this condition, the muscle fibers gradually undergo degeneration and are replaced by fat and fibrous tissue. This replacement impairs the muscles' ability to function properly, leading to the characteristic muscle weakness and loss of mobility associated with muscular dystrophy.

People with muscular dystrophy may experience difficulty performing everyday activities due to muscle atrophy and the replacement of healthy muscle tissue. The condition can vary in terms of symptoms and severity, but the underlying process of degeneration and replacement of muscle tissue with fat and fibrous tissue is a hallmark of muscular dystrophy.

Other options like cerebral palsy focus on movement and posture due to brain damage, hemophilia refers to a blood clotting disorder, and achondroplasia is a genetic disorder affecting bone growth, none of which involve the specific degeneration of muscles with replacement by fat and fibrous tissue.