Post-surgery, a child with hip dysplasia might exhibit temporary loss of muscle tone due to which factor?

The temporary loss of muscle tone observed in a child with hip dysplasia following surgery can primarily be attributed to immobilization in a spica cast. When a child is placed in a spica cast after surgery, the affected limbs, and ultimately the muscles, are restricted from movement for an extended period. This lack of movement can lead to muscle atrophy and reduced muscle tone as the muscles are not engaged in regular activity.

Immobilization prevents the muscles from receiving the normal stimulation required for strength maintenance and growth. This post-surgical care, while necessary for proper healing of the hip joint, creates a temporary state where the muscles surrounding the hip region do not function adequately, leading to a noticeable decrease in muscle tone. Once the cast is removed, and rehabilitation begins, muscle tone typically improves as the child resumes movement and rehabilitation exercises.