S.C. Code Ann. § 42-1-172

(A) "Repetitive trauma injury" means an injury which is gradual in onset and caused by the cumulative effects of repetitive traumatic events. Compensability of a repetitive trauma injury must be determined only under the provisions of this statute. (B) An injury is not considered a compensable repetitive trauma injury unless a commissioner makes a specific finding of fact by a preponderance of the evidence of a causal connection that is established by medical evidence between the repetitive activities that occurred while the employee was engaged in the regular duties of his employment and the injury. (C) As used in this section, "medical evidence" means expert opinion or testimony stated to a reasonable degree of medical certainty, documents, records, or other material that is offered by a licensed and qualified medical physician. (D) A "repetitive trauma injury" is considered to arise out of employment only if it is established by medical evidence that there is a direct causal relationship between the condition under which the work is performed and the injury. (E) Upon reaching maximum medical improvement, the employee may be entitled to benefits pursuant to Section 42-9-10, 42-9-20, or 42-9-30. Medical benefits for compensable repetitive trauma injuries shall be as provided elsewhere in this title.