Self Medication With Oral Morphine After Total Knee Arthroplasty.
Self Medication With Oral Morphine After Total Knee Arthroplasty.
The study aims to compare two post operative pain management strategy's, traditional nurse
 dispensed pain control versus patient self medication. The investigators aim to establish if
 patients who self medicate have differing pain levels than those who take nurse dispensed
 oral morphine.
Inclusion Criteria:

 -  Patients requiring total knee replacement surgery willing to provide written, informed
 consent.

 Exclusion Criteria:

 -  Unable to safely self medicate.

 Allergy to morphine.

 Unable to provide consent.

 Contraindication to the standardised anaesthetic or standard postoperative care.

 Not consenting to an element of the standardised anaesthetic.

 Pre-operative use of strong opiates e.g. Oramorph, MST, Oxynorm.