Firstly welcome aboard, we're always happy when a new member joins us online.
With regards to your exercise with a sore leg, you need to mix up exercises that help strengthen your leg with ones that don't put too much pressure on it.
Swimming, aqua aerobics and bike riding are obvious choices for those that don't put any/much pressure on your leg.
Bike riding would be perfect because it is low/no impact but still helps to strengthen your leg muscles and bones.
To strengthen the leg, I would use specific strength training (weights) exercises such as light squats, 45 degree leg press, leg extensions, lunges, etc. You'll find these exercises in the workouts section of this website. I've put a direct link below to make it easier for you to find:
In addition to these, walking, stair and hill climbing (small hills, not mountains!) will all help to strengthen your leg and help you burn all those unwanted calories.
Stretching the muscles around you old injury is also very important.
In the next few weeks we're planning on adding a full body stretching routine to our workouts section, so look out for that.
If the pain in your leg persists, you may also want to consider visiting an osteopath or a physiotherapist, who may be able to help identify the cause and provide a solution to your problem.
If you need one, there are many great osteopaths listed in your state in the weightloss directory of this site.
Here's a link:
Hope all or some of the above is helpful.
Good luck with the leg and the weight loss and I'm sure I speak for all members of this forum when I say that we look forward to speaking to you and hearing about your weight loss successes regularly.