Myelopathy myo-lop-a-thee. Myel ['spinal cord'] opathy ['problem'] is a disease of the spinal cord. This can be distingiushed from a radiculopathy or neuropathy based on the symptoms and findings during a doctors examination. Myelopathy is therefore a descriptive term and many different disease processes can cause it.
Taekwondo is a martial art that was developed by the Koreans with tactical preferences for kicks over hands (although both are included), while Karate is a Japanese development of hand fighting which was refined in Okinawa, and likely brought there from early hand fighting in China.
-Karate is a term for many different martial arts such as kyushin, shotokan, and goju-ryu. Like Katana said, Okinawan karate uses joint-locks, sweeps, punches, kicks, even stand up grappling. Many of the techniques in karate focus on power and strength that are way more than 20% effective in a fight.