Louwrens v Oldwage

The respondent (plaintiff), James Peter Oldwage, consulted his general practitioner and was referred to the appellant (defendant), Dr Henk Douw Louwrens, a vascular surgeon, in June 2000 for severe pain in his right leg. After clinical examination and an angiogram showing occluded arteries and poor blood flow, the defendant diagnosed severe ischaemia and performed an iliac bi‑femoral bypass operation. Subsequently, the plaintiff was diagnosed by a neurosurgeon with a prolapsed lumbar disc and underwent back surgery, which relieved his pain. The plaintiff alleged that the defendant negligently misdiagnosed his condition (which he claimed was neurological rather than vascular), failed to obtain informed consent, and caused claudication in his left leg through the surgery. The High Court found in favour of the plaintiff on negligence, and the defendant appealed to the Supreme Court of Appeal.

The appeal was upheld. The High Court’s finding of negligence was set aside, and judgment was entered in favour of the defendant.

The case is significant for its authoritative restatement of the approach to resolving factual disputes in civil trials, particularly where expert medical evidence is involved. It clarifies the appellate court’s power to reassess facts where credibility findings are not clearly articulated and emphasizes objective probabilities. It also reaffirms principles governing medical negligence, specialist standards of care, and the evaluation of informed consent in South African law.