An analysis of frequencies, causes and injury patterns in skiing with emphasis to knee injuries was done. In our clinic next to the slopes of the ski resort Pfronten and the skiing region Ostallgäu skiing injuries contribute with 58% of all stationary treated sports injuries to a big part of our in-patients. Out of all skiing injuries 52% are ligament lesions and 63% concern the knee joint. Thus the knee ligament lesions are leading in our sports related orthopaedic surgery. The results of this analysis were compared with data from Swiss skiing areas and Austrian and German university clinics. Possible ways of injury prophylaxis are presented.