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It seems that the soft cast was quite tight and compromised the blood supply of the nerve. This can take 48-72 hours to return back to normal. Ketoprofen is good as an anti-inflammatory, so you can continue with it. The extremes of temperatures are avoided; so if you want to use compresses, be careful, as the sensations are not normal and may not perceive the temperature sensation correctly. You may use luke warm moist compresses. Talking to your orthopedic specialist also would be prudent.
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Yes. You can continue with the Ketoprofen and warm compresses. Barefoot walking and not touching is a good idea, though just be careful while walking, taking good care of the foot.
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The nerves injury due to blood supply compromise also gets better and this blood supply disruption with the cast is partial, so there is all the good chance that it would recover fully. It is not a direct nerve injury usually but secondary to decreased blood supply to nerve.
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