Tetraparesis

Partial weakness or reduced voluntary movement affecting all four limbs, commonly caused by cerebral palsy, spinal cord injury, or neuromuscular disease. Tetraparesis sits on a spectrum with tetraplegia (complete paralysis of all four limbs) and has significant implications for input accessibility: users may rely on alternative controllers, switch access, eye tracking, head tracking, voice input, or shared-control arrangements. Spastic tetraparesis additionally involves involuntary muscle tightness that further reduces input precision.