A 14-year-old patient reports to the emergency room followin…

A 14-year-old patient reports to the emergency room following a cycling accident where he fell off his bike and struck a tree with his arm.  X-rays show that this patient has a fractured humerus. The patient presents with significant weakness with elbow and wrist extension. Based on the patient’s motor weakness, you suspect that the fracture occurred in the region of which bony landmark of the humerus? (Hint: First ask yourself which terminal branch of the brachial plexus is likely affected.) 

A patient arrives at your clinic with knee pain after incurr…

A patient arrives at your clinic with knee pain after incurring a blow to the anterior tibia during a soccer game. You perform a test that involves applying pressure to the anterior proximal tibia and attempting to move the tibia posteriorly on the femur. What ligament of the knee are you testing?