I'm obese & in '08 had 2 torn ligaments + ankle in a cast + swollen foot for 3 months. till date i want to use orbitrack but can't because foot swells.

Weight control...: ...By diet to achieve a weight closer to your ideal may be your only option at present. Combine aggressive weight loss through diet with modest exercise until your weight is low enough to tolerate the weight bearing of your elliptical.

Ankle Sprain: Ligaments and tendons have longer healing times because they have poor blood supply, and are made of thick, fibrous tissues. Swelling may last for many months after a soft tissue injury. If it does not heal or you feel unstable, go to your podiatrist and have an MRI performed to see if the ligaments are ruptured. May require surgery to fix the ligaments.

See below: You need to be fot with a compression brace to stabilize the ankle ; then you might be able to use the exercise apparatus.