title: Variants of the PTB (patellar-tendon-bearing) below-knee prosthesis.
mesh_terms: D001186:Artificial Limbs / Q000266:history / Q000295:instrumentation; D049673:History, 20th Century; D007866:Leg / Q000601:surgery; D010329:Patella; D011474:Prosthesis Design; D014481:United States