Calcium exchange in bone

Abstract

The percentage of exchangeable bone Ca in unashed compact ox bone has been determined as 33% by the loss of 45 Ca ions both from a radioactive solution, and from bone previously equilibrated with 45 Ca. Results were similar. The time taken for the exchange process to reach equilibrium depends on the size to which the bone has been ground. For particles passing through a 200/in. mesh the initial rapid exchange is completed in 2-4 hours.