The "Give Your Heart a Break" singer tweeted photos of crazy-bad leg bruising, her crutches and her cast Friday ... Lovato has yet to comment on how long she'll be on crutches, or the severity ...

The “Freedom Leg” is an “off-loading prosthetic” which lets you ditch the crutches and keep on walking ... It straps to your thigh and the angled composite bars replace the rest of ...