Hmm..

Okay here are some things I am going to ask you to do, and maybe you can try them and tell me what happens (please be careful not to induce any pain).

Firstly while in sitting:

1. Flex your calf muscles and notice the response
- Add resistance on your knees (with your hands) and repeat
Is there a difference?

2. Dorsiflex your ankle and notice the response

3. Evert the ankle (ie. your outside heel should raise from the floor)
- Is there a pain response? In any of these movements?

Finally repeat the above while in standing.

The reason I ask is because I can not quite figure out exactly where you have descibed the source of problems. The lateral collateral refers to the ligaments of the knee which can only be tested for by hands on work by a therapist. If it is truely muscle or tendon then the above should at least give some indication of which muscles are effected. The area you describe is where the ankle everters (Peroni Longus, and Brevis) attach on the Head of the Fibula. Additionally, the hamstings (biceps femoris) has an attachment on the posterio part of the Head of Fibula. If the above is pain free, then the hamstrings may be suspect and another test is necessary.

Cheers