I can't either! I think I injured mine at work awhile back. Now I can't bend my thumb. I got x-rays from my doctor and she said nothing was broken but I am in soo much pain. Even when I am not moving my thumb I feel constant pressure on the part where the thumb bends forward.
You may not be able to for multiple reasons. Pain? Neurological? or just can't. haha sorry not much help here.
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