1. Types, Range, Muscles Involved
   1. Shoulder
   2. Elbow
   3. Hip
   4. Knee
      1. pivotal hinge joint
         1. Topic
      2. articulation
         1. flexion
            1. semimembranosus
            2. semitendinosus
            3. biceps femoris
            4. gracilis
            5. sartorius
            6. popliteus
            7. gastrocnemius
         2. extension
            1. quadriceps
            2. Tensor fasciae latae
            3. some assistance only
   5. Ankle