Abstract: Objective To study the deduction of injury-causing instruments and its value as judicial evidence. Methods To collect 146 cases involved in injury-causing instruments deduction, which accepted by Judicial Appraisal Center of Wannan Medical College during the period from 1998 to 2007, then to deduce the instrument by analyzing the characters of injuries in body surface. The accuracy of those deductions was evaluated by comparing the deduced instruments with the actual instruments. Results The deduction from sharp injuries was more accurate than that from blunt injuries. Conclusion Sometimes the result of deduction about injury-causing instruments are uncertain, it may be accepted as judicial evidence when supported by other evidences.

Key words: forensic pathology, wounds and injuries, wounds, nonpenetrating, sharp instrument injury, deduction of injury implements