Questão jurídica principal
Whether the accident insurer remained liable for benefits after 19 October 2004 for the knee injury and surgery.
Decisão extraída
Yes. Although the cruciate ligament had pre-existed, the accident on 28 August 2004 triggered the knee instability, and the status quo ante had not been restored by 19 October 2004.
Fundamentação extraída
Natural causation exists even if the accident is only a partial cause. The decisive point was that the knee was clinically unremarkable after the earlier treatment, but became unstable only after the later trauma; whether the trauma caused the rupture or merely manifested the pre-existing defect was irrelevant.