Poor control of blood sugar at the time of an operation is known to increase the risk of poor wound healing and infections. This could delay your recovery and may even result in the failure of a joint replacement operation.
Target is blood sugar between 4-10mmol/l and HbA1c less than 69mmol/mol, (8.5%). If your HbA1c is more than 69mmol/mol then it suggests inadequate control of blood sugar.
Ideally you should attempt to achieve these targets prior to your operation and seek advice from your GP or hospital diabetes team.
More information is available in the leaflet at the foot of this page.