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"Too many" types of hernia mesh implants are being used on NHS patients with little or no clinical evidence, this programme has been told.
New data shows more than 100 different types of mesh were purchased by NHS Trusts from 2012 to 2018 in England and Scotland, leading to fears over safety.
The meshes can cut into tissue and nerves, leaving some people unable to walk, work or care for children.
The regulator MHRA said there was a clinical need for the devices.
The Royal College of Surgeons of England said: "Our duty is to explain the options and risks to patients, so they can decide what the best course of action is for them."
It is campaigning to improve regulation and monitoring of new devices and implants.
A Department of Health and Social Care spokesperson said: "On the rare occasion where a patient has suffered as a result of a mesh procedure, we are taking steps to improve patient safety - including improving how we listen to patients and how the system learns when concerns are raised."
Anna Collinson reports.