The woman has been released from Royal Stoke University Hospital with a broken wrist and serious cuts, but is now recovering at home with family.
A police cordon was in place outside Central Square nightclub as investigators took photographs and tried to establish what might have happened.
The fire service were in attendance, as were a number of road ambulances and several police vehicles.
A police spokeswoman said: "The 87-year-old lady involved in the incident has been released from Stoke hospital with a broken wrist and lacerations but she is now recovering at home with family."
A 34-year-old man was arrested in connection with the incident and will return to the police station at a later date.
Anyone with any information should call police on the non-emergency 101 number quoting incident reference number 0249s of November 22.
Alternatively, contact Crimestoppers anonymously on 0800 555111 or at crimestoppers-uk.org