INJURY ON DUTY Any unit employee who suffers an injury while working during the course of his/her employment for the County shall be entitled to injury leave until said employee is able to return to work or is terminated in any manner and subject to any limitations imposed by this Article or State Law. Injury means a sudden and tangible happening of a traumatic nature, producing an immediate or prompt result and resulting from external force, including injuries to artificial members. Any injury sustained by an employee while engaging in an athletic or social event sponsored by the employer shall be deemed not to have arisen out of or in the course of employment unless the employee received remuneration for participating in such event. For purposes of this Article, coronary thrombosis, coronary occlusion, or any other ailment or disorder of the heart, and any death or disability ensuing therefrom, shall not be deemed to be an injury by accident sustained arising out of and in the course of the employment except for Sheriff employees who are covered by state statutes.