Key legal question
Whether the surgeon breached the duty of care and is liable for contractual damages and moral harm
Extracted holding
The appellants did not prove a violation of medical standards or a breach of the surgeon’s duty of diligence.
Extracted reasoning
The cantonal courts relied on an expert report deemed reliable; the appellants' alternative explanations for the detachment of the prosthetic head were speculative and merely appellatory. The occurrence of the complication alone did not establish a breach of duty.