Abstract: Summary The condylar osteochondroma of exogenous type is usually treated by surgical resection, but the scope of resection is usually based on surgeon's experience, which leads to a certain risk of recurrence and injuries of important vessels and nerves. We reported a case of a giant condylar osteochondroma of exogenous type, preoperative planning was conducted using computer-aided design (CAD) technique (Proplan 1.3) for determining the boundary between the tumor and the articular surface of condyle, and designing the virtual tumor resection plane, surgical approach and remove-out path of the tumor. Rapid prototyping (RP) technique was used to make osteotomy template based on the preoperative planning. The application of digital template could improve the accuracy of the giant condylar tumor resection and help to preserve the uninvolved condyle. The use of digital template could reduce injuries to the nerves and vessels, as well as save the operation time.

Key words: Digital osteotomy template, Osteochondroma, Surgical treatment