Is myosithis something to worry about when it cause high cpk elevation due to injury calves muscle?

Whoa: Myositis does not result from injury. If your CPK is up from a physical injury to your calf muscles, it's to be expected. If you exercise hard and often, your CPK will be higher -- often much higher -- than the lab's reference range in any case. If you do indeed have an illness in the "myositis" family of muscle diseases unrelated to fitness or injury, you will realize it.