Abstract
The forces and moments applied to the leg by the ski during skiing are compared to the forces necessary to cause injury to the tibia and ligaments at the knee and to standard recommendations for ski release binding adjustment. These forces and moments of recreational skiing are shown to be similar to, or greater than, those capable of causing injury to the knee and tibia. The adjustment of release bindings by current standards unavoidably permits forces of sufficient magnitude to cause injury to the skier. Release bindings cannot be adjusted to guarantee that the forces transmitted to the boot are below an injury threshold for a large fraction of the population. The role of muscle contraction in skiing safety requires complete recognition in the knowledge base on skiing safety.

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