I usually wear  a leg brace when I bowl in my bowling league on Wednesday nights but I seem to have lost it. Is there something I can use in place of a leg brace?

If you need a temporary solution, you might consider using a compression sleeve or an ACE bandage for some support. Kinesiology tape can also provide stability if applied correctly. Just be mindful of how your leg feels while bowling and avoid pushing too hard. Hope you find a good solution.