It would take several months for you to start walking normally again after an injury in your foot. Being able to walk on heels after a broken ankle would take a lot of trial and error. It could get you years of training for your injured foot to endure the pressure and weight of your body while wearing those heeled shoes. If you have done your rehab and you're already walking just fine, do not immediately wear those 5-inch shoes of yours. It's different when you walk on flat slippers than with heels. The tendency is, the tension may cause another damage from your previous injury. You want to find a pair that would not shock your feet. Say start with 1-inch pairs of heels, then increase the height to 2-inches, then 3-inches, and so on. However, you must know how high you can manage without enduring any lingering pain on your toes. When you have those perfect pairs, test them around the house or your neighborhood. Just do short distances first and make sure you're not walking on a rough and rocky path. If you feel like you're getting it, you could go shopping wearing those heels.