Marrone v Employers Mutual Ltd

The Supreme Court of South Australia considered a question of law referred by the Full Bench of the Workers Compensation Tribunal concerning the interpretation of section 43(6) of the *Workers Rehabilitation and Compensation Act 1986* (SA). The dispute arose from Mr Marrone's claim for lump sum compensation for non-economic loss, where he suffered disabilities to his right elbow, forearm, and shoulder due to repetitive lifting, and subsequently developed a left shoulder disability due to compensatory overuse and aggravation of a pre-existing condition. The compensating authority, Employers Mutual Ltd, accepted that the left shoulder disability occurred due to the compensatory overuse following the right-sided injuries.

The central legal issue before the Court was whether, for the purposes of section 43(6), two or more disabilities with multiple causes are to be treated as arising from the same trauma only if the same event or series of events causes both disabilities, or if it is sufficient that at least one of the separate causes of these disabilities is common to both. This question arose from the Tribunal's finding that Mr Marrone's left shoulder disability, while developing gradually and having multiple contributing factors, was causally linked to the initial trauma of 8 June 2006, which caused his right-sided injuries.

The Court reasoned that section 43(6) applies when one and the same trauma causes two or more compensable disabilities. It held that the phrase "same trauma" in section 43(6) requires that all events in a series must have operated as a cause of both impairments. The Court distinguished this provision from section 54(7)(b) of the Act, noting that section 43(6) focuses on the physical occurrence of the trauma causing the disabilities, rather than the legal rights arising from it. The Court concluded that the text and context of section 43(6), supported by High Court authority in *Manser v Spry*, indicate that a comprehensive series of events must have caused both disabilities for them to be treated as arising from the same trauma.

The Court answered the question posed by the Tribunal in the affirmative, indicating that the disabilities must arise from the same trauma in the sense that the same event or series of events causes both.