What is the rationale for the location of the knob/handle on a door?
Moving the handle from the hinge increases the moment arm, which increases the amount of torque given the same force applied.
After a total knee arthroplasty, what component of rehabilitation is most predictive of successful outcome?
Quadriceps strength in both the affected and unaffected limb has been demonstrated to have the highest correlation to outcome (not ROM, gait speed, balance)
What are the core muscles and what is their purpose?
The "core" consists of a variety of muscles creating a container resembling a short cylinder. The diaphragm creates the top, while the bottom is composed of the pelvic floor muscles. The sides consist of the external and internal obliques, as well as the small transverse abdominus. The core muscles are designed to transmit force from the lower extremity to the upper extremities. If the muscles can create more stiffness, the body is more efficient at transmitting forces and can therefore produce more power with upper extremity movements like throwing, pushing, pulling, etc.