This sort signifies a pure tendinous injury where the extensor tendon is stretched or torn, but no bone is damaged. The hurt takes place on the soft tissue connecting muscle to bone, leading to The shortcoming to straighten the fingertip without having help. The doctor will want to look at https://www.theorthopaedicandpainpractice.com/why-cant-i-straighten-the-tip-of-my-finger/