Crutch having joint structure

A crutch having a joint structure, the crutch comprising

• a stationary section supported on a floor at a lower end of the stationary section, and extending from a lower portion to an upper portion thereof;
• and
• a rotary section coupled to the stationary section so as to be rotatable relative to the stationary section with respect to a rotational axis provided at the upper portion of the stationary section,
• wherein the rotary section is configured by coupling a hand grip part for supporting a wearer's hand in a state where the wearer wears the crutch and a forearm part supporting a forearm of the wearer,
• further including a locking mechanism configured to inhibit a relative rotation between the stationary section and the rotary section at a preset fixed angle corresponding to a state in which the wearer wears the crutch in a standing posture,
• wherein the locking mechanism comprises a protrusion formed to be protruded outward from the stationary section and a through hole formed by penetrating the rotary section to correspond to a shape of the protrusion, such that as the protrusion passes through the through hole, a relative rotation between the stationary section and the rotary section is inhibited, and
• wherein the protrusion and the through hole are located on the rotational axis between the stationary section and the rotary section, and the protrusion is formed in a column shape having a triangular cross section.