Sometimes during hip replacement surgery it is necessary for the surgeon to need to fit a larger or smaller implant, depending on the condition the original hip is in. This can cause the leg length to change.
There are many ways to manage a change in leg length after surgery, but for this to class as negligence, there would need to be proof that the surgeon or medical professional in charge of obtaining informed consent failed to alert the patient of this risk. Surgeons should try to achieve symmetrical leg length after hip replacement surgery, but as discussed this isn’t always achievable.