a. What bones does it appear were removed?
b. Harry's arm maintains it's basic shape pretty well. Do you think this would be the case if bones were really removed from an arm? What do you think it would look like? How is the skeleton involved in maintaining structure?
c. Harry still has all his muscle and nerves, but seems unable to move his arm himself. What role does the skeleton play in movement?
d. Are there any natural physical proceses that can remove bones? In Roger Highfield's The Science of Harry Potter, Clinton Rubin suggests that perhaps Lockhart's spell activated and accelerated the action of osteoclasts, that destroy other cells? What are real conditions (medical or environmental) that can result in bone loss?