Then the calcium and phosphorus contents of callus in fracture gaps and the serum levels of bone - specific alkaline phosphatase ( b - alp ) were determined . [ result ] the calcium and phosphorus contents of callus increased throughout the healing process 结果试验组和对照组骨折间隙内骨痂钙、磷元素的含量均逐渐升高;血中骨特异性碱性磷酸酶的活性分别于术后4 、 8周升至峰值,随后缓慢下降。