How many years can an implanted plate be stored in the body? I
The requirements for implanted metallic materials are "harmless to the human body"
Different materials, the use of life will be different. Titanium use of the longest life, up to more than 20 years.
Only in this premise can be allowed to use in the human body. So do not worry about this.
As for the useful life, the main consideration is the material in the human body electrolytic durability of the environment corrosion. For sports joints, but also consider wear