Wiktionary (0.00 / 0 votes) Rate this definition: fartlek (Noun) An athletic training technique, used especially in running, in which periods of intense effort alternate with periods of less strenuous effort in a continuous workout.
Knee Problems and Injuries - Check Your Symptoms. Knee Problems and Injuries. Knee Problems and Injuries. Knee Problems and Injuries. Call 911 if a bone is poking through the skin. The hurt limb or joint looks odd, is a strange shape, or is out of its normal position. The skin over the site of an injury is broken. You have signs of nerve or blood vessel damage, such as: Numbness, tingling, or a pins-and-needles feeling.
Other health problems can cause symptoms like those of an ACL injury. They include a bone break or injuries to the knee cushions (menisci) or to other ligaments in the knee. For more information on knee injuries, see: 1  Knee Problems and Injuries.