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The Markle sign or jar tenderness is a clinical sign in which pain in the right lower quadrant of the abdomen is elicited by dropping from standing on the toes to the heels with a jarring landing. It is found in patients with localised peritonitis due to acute appendicitis. It is similar to rebound tenderness, but may be easier to elicit when the patient has firm abdominal wall muscles. Abdominal pain on walking or running is an equivalent sign.