Definition: Given an abstract, generate a keyword (a noun phrase) that best describes the focus or contribution of the paper. Such keywords can be directly from the given abstract or outside it.
Input: Abstract: Two cases of osteochondritis dissecans of the talar dome treated by closed percutaneous drilling are presented to illustrate a procedure for high-risk patients. The operation is performed with the aid of an image intensifier. The ostoechondral fragment is percutaneously drilled to avoid open operation and osteotomizing the medial malleolus.

Case Report