求助一个句子的翻译

The terms \"promote bone growth\" and \"increase bone mineralization\" refer to the observable physical changes in bone and are intended to be neutral as to the mechanism by which changes in bone occur.
前半部分很好翻，后半部分实在是有点头大，请各位指点一下。

“促进骨骼生长”以及“增加骨骼矿物质含量”指能看得见的身体骨骼变化，且由于骨骼发生变化的机制的限制，该说法有一定的不确定性。
FYI

be neutral as to the mechanism by which changes in bone occur.
可以理解为

be independent  of the mechanism by which changes in bone occur.
不依赖于骨头变化的发生机制