How does an orthosis function to substitute for ligaments?

An orthosis functions to substitute for ligaments primarily by protecting the joint against excessive translatory movement. Ligaments are critical components in stabilizing joints, providing support and restricting movements that could lead to injury. When a ligament is compromised, either due to injury or condition, an orthosis can be applied to mimic the constraints that the ligament would typically provide.

By restricting certain movements, particularly translatory movements—the sliding or gliding of bones in relation to one another—the orthosis helps to stabilize the joint. This stabilization is crucial in maintaining proper joint mechanics, preventing further injury, and allowing for healing.

While enhancing muscle strength, improving range of motion, and increasing joint stability are relevant considerations in orthotic management, the primary role of an orthosis in this context is to mimic the function of ligaments by controlling and protecting the joint against undesirable movements. This protective function allows for rehabilitation and improves overall joint stability over time.