Sounds like you can prove notice. Do what the doctors tell you and talk to a MI personal injury trial lawyer instead of the store or its insurer.
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As a general rule premises owners are liable to invitees who are injured on the owner's premises, but only if the owner was somehow negligent or created a dangerous condition. There is a rule in Michigan that if a condition of a premises is "open and obvious" that the premises owner has not duty to the invitee as to such a condition as it is presumed the invitee can avoid an obvious danger.
The open and obvious defense would not apply to a contractor that installed a hazardous device on the premises.
Your case against Aldi would be arguable, but probably tough. Although if you engage them in conversation about paying medical bills and any other economic losses, it is possible they may pay without regard to the open and obvious doctrine. It is also possible they have a medical pay policy that may cover your medical bills without regard to arguments about fault.
If an outside contractor improperly installed the canopy/structure, you may have a claim against them.
However, whether the claim is economically worth a lawyers time really depends on the extent of your injury, scarring, medical treatment, permanency of injuries, etc.
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