Question: Freshly parturated cows not able to stand?

I've seen 3 cows recently parturated all of them in recumbency not able to stand. All conventional treatments have been used starting from calcium therapy. Hypertonic glucose solutions. Intalyte. Phosphorus. Liver extracts. Multivitamins. Antibiotics.Analgesics. Everything but I myself think that they are having symptoms of lameness in one or more legs resulting in recumbency although no fracture or something like that and is like an sporadic outbreak what may be the cause and treatment thereof. Any special examination necessary for diagnosis?

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