Which type of paralysis affects only one limb?

Monoplegia refers specifically to paralysis that affects only one limb, typically an arm or a leg. This condition can arise from various causes such as stroke, brain injury, or other neurological conditions impacting motor function in a localized manner.

Understanding the other terms can help clarify why they do not apply in this context. Hemiplegia involves paralysis on one side of the body, affecting both the arm and leg on that side. Diplegia indicates paralysis affecting symmetrical parts of the body, often both legs or both arms, commonly seen in conditions like cerebral palsy. Paraplegia refers specifically to paralysis that affects both legs, usually due to spinal cord injury or other medical conditions.

Therefore, monoplegia is the correct term for paralysis that strictly impacts a single limb.