One of the most frequent injuries occurring in volleyball is evidently yumper’s knee, which could separate player from practice and playing for several months. Becau- se occurrence of this syndrome of overstressing are common despite the modern techni- ques of medical treatments, it is therefore crucial to find the real source of this problem as wel as developing new preventive measures. Examples of what could be done as a prevention of this syndrome is given in the summary of this paper
