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This can be something serious like a fractured bone.At the age of 88 the bones are mostly very weak and osteoporosis usually sets in such bones.These weak bones are liable to fractures even with minor trauma.I would suggest you to take him to ER and get evaluated . For relief of pain he can take some pain medicines like Tylenol and Ibuprofen with omeprazole but he needs evaluation at the earliest.
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Another thing which need to be ruled out is the possibility of any spinal cord lesion which can occur after trauma to the back and the victim can,t move due to loss of muscle power in the lower limbs and that too need immediate evaluation.