The patients were divided randomly into three groups : group A , the patients with remained length of tibial stump ranging from @ to @ mm , including @ males and @ females , with an average age of ( @ @ ) years old ; group B , the patients with remained length of tibial stump ranging from @ to @ mm , including @ males and @ females , with an average age of ( @ @ ) years old ; group C , the patients with remained length of tibial stump less than @ mm , including @ males and @ females , with an average age of ( @ @ ) years , old .