Olivia Unwin1, Mohammed Hassaballa2, James Murray3, William Harries4, Andrew Porteous5. 1. University of Bristol, Senate House, Tyndall Avenue, BS8 1TH Bristol, United Kingdom. Electronic address: ou0794@my.bristol.ac.uk. 2. Bristol Knee Group, Avon Orthopaedic Centre, Southmead Hospital, BS10 5NB Bristol, United Kingdom. Electronic address: mahassaballa@gmail.com. 3. Bristol Knee Group, Avon Orthopaedic Centre, Southmead Hospital, BS10 5NB Bristol, United Kingdom. Electronic address: james.murray@nbt.nhs.uk. 4. Bristol Knee Group, Avon Orthopaedic Centre, Southmead Hospital, BS10 5NB Bristol, United Kingdom. Electronic address: william.harries@nbt.nhs.uk. 5. Bristol Knee Group, Avon Orthopaedic Centre, Southmead Hospital, BS10 5NB Bristol, United Kingdom. Electronic address: andrew.porteous@nbt.nhs.uk.
Abstract
BACKGROUND: MIS TKA has been shown to offer a reduced in-patient stay, but no clinical difference at two years. Whilst there may be a benefit from earlier discharge, we need to ensure that there are no detrimental effects in the medium and long-term following MIS-TKA. To report the mid-term result from a prospective randomised controlled trial (RCT) comparing MIS-TKA with standard approach for TKA. METHODS: Using knee score questionnaires, we collected patient reported outcome measures (PROMs) regarding pain and function. Sixty-six patients (from an eligible cohort of 83 patients) completed the mid-term postal follow-up. RESULTS: There was no significant difference between groups for change in score from pre-operative to final follow-up in all three PROMs. Mean MIS and standard group improvement was: AKSS 53 and 51 (p=0.7644), OKS 15 and 16 (p=0.2341) or WOMAC 15 and 15 (p=0.9900) respectively. Both groups showed improvement in pain and function with no significant difference between groups. There was no difference between groups for revision due to malalignment at a mean six year follow-up. CONCLUSIONS: In addition to the early benefits regarding hospital stay and complications, we have found that at a mean of six years there was no increase in malalignment, pain or function with MIS techniques.
RCT Entities:
BACKGROUND: MIS TKA has been shown to offer a reduced in-patient stay, but no clinical difference at two years. Whilst there may be a benefit from earlier discharge, we need to ensure that there are no detrimental effects in the medium and long-term following MIS-TKA. To report the mid-term result from a prospective randomised controlled trial (RCT) comparing MIS-TKA with standard approach for TKA. METHODS: Using knee score questionnaires, we collected patient reported outcome measures (PROMs) regarding pain and function. Sixty-six patients (from an eligible cohort of 83 patients) completed the mid-term postal follow-up. RESULTS: There was no significant difference between groups for change in score from pre-operative to final follow-up in all three PROMs. Mean MIS and standard group improvement was: AKSS 53 and 51 (p=0.7644), OKS 15 and 16 (p=0.2341) or WOMAC 15 and 15 (p=0.9900) respectively. Both groups showed improvement in pain and function with no significant difference between groups. There was no difference between groups for revision due to malalignment at a mean six year follow-up. CONCLUSIONS: In addition to the early benefits regarding hospital stay and complications, we have found that at a mean of six years there was no increase in malalignment, pain or function with MIS techniques.