Well that's a nifty keepsake huh? Nothing like a chunk of medical grade titanium extracted from your leg by your hottie spiderwife during a back alley surgery in your house overseen by a cat providing you with illegal non habit forming opioids.
It's more likely to be 316L stainless steel. Titanium has really strong osteointegration and wouldn't be used for fracture fixation.
Source: I'm a biomedical engineer.