ISRCTN ISRCTN03013488
DOI https://doi.org/10.1186/ISRCTN03013488
ClinicalTrials.gov number NCT01352247
Secondary identifying numbers HTA 08/14/08; Version 1
Submission date
08/04/2009
Registration date
09/04/2009
Last edited
06/05/2020
Recruitment status
No longer recruiting
Overall study status
Completed
Condition category
Musculoskeletal Diseases
Prospectively registered
Protocol
Statistical analysis plan
Results
Individual participant data

Plain English Summary

Background and study aims
Osteoarthritis is a condition that causes the joints to become painful and stiff. Osteoarthritis of the knee affects a large proportion of the population and this is set to increase over time. Quite often the arthritis is limited to one area of the joint, particularly the inside of the joint. Patients can either have a partial knee replacement or a total knee replacement. The partial knee replacement, as its name suggests, involves the removal and replacement of only the diseased part of the joint. Total knee replacement involves the removal and replacement of the entire knee joint. Total knee replacement is easier to do and considered more reliable (lower failure/revision rate), but it involves cutting away healthy parts of the joint. Partial knee replacement retains healthy tissue and usually achieves better functional results, but is more difficult to do and can have an increased failure/revision rate. There are also significant cost advantages for the healthcare system for partial knee replacements. Unfortunately we currently do not know which type of replacement is best for these particular patients. Hence, the aim of this study is to directly compare the clinical and cost-effectiveness of total knee replacements versus partial knee replacements for patients with osteoarthritis.

Who can participate?
Patients aged 40 or over with osteoarthritis

What does the study involve?
The study is carried out at the local hospital where the patient would normally have their knee replacement. Patients recruited to the study are randomly allocated to undergo either total or partial knee replacement surgery. Patients are then followed up for 10 years after the surgery. The measurements taken to assess which type of knee replacement is better are predominantly patient based. This means that the measurements directly assess how the patient, rather than the surgeon, feels about the outcome after their operation.

What are the possible benefits and risks of participating?
Not provided at time of registration

Where is the study run from?
University of Oxford (UK)

When is the study starting and how long is it expected to run for?
November 2009 to December 2018

Who is funding the study?
NIHR Health Technology Assessment Programme - HTA (UK)

Who is the main contact?
Prof. David Beard
david.beard@ndorms.ox.ac.uk

Study website

Contact information

Prof David Beard
Scientific

Nuffield Department of Orthopaedic, Rheumatology & Musculoskeletal Sciences
Windmill Road
Headington
Oxford
OX3 7LD
United Kingdom

ORCiD logoORCID ID 0000-0001-7884-6389
Phone +44 (0)1865 227695
Email david.beard@ndorms.ox.ac.uk
Ms Loretta Davies
Scientific

Surgical Intervention Trials Unit
NDORMS
Botnar Research Centre
University of Oxford
Nuffield Orthopaedic Centre
Windmill Road
Oxford
OX3 7LD
United Kingdom

Phone +44 (0)1865 737210
Email loretta.davies@ndorms.ox.ac.uk

Study information

Study designMulticentre prospective superiority randomised controlled trial
Primary study designInterventional
Secondary study designRandomised controlled trial
Study setting(s)Hospital
Study typeTreatment
Participant information sheet Not available in web format, please use the contact details to request a patient information sheet
Scientific titleClinical and cost-effectiveness of total knee replacements versus partial knee replacements for patients with medial compartment osteoarthritis: a multicentre randomised controlled trial
Study acronymTOPKAT
Study hypothesisTo assess the clinical and cost-effectiveness of total knee replacements versus partial knee replacements for patients with medial compartment osteoarthritis.

More details can be found at: http://www.nets.nihr.ac.uk/projects/hta/081408
Ethics approval(s)Oxfordshire REC C, 04/09/2009, ref: 09/H606/88
ConditionOsteoarthritis/avascular necrosis
InterventionTotal knee replacement surgery versus unicompartmental knee replacement surgery. Patients will be followed up for 10 years post surgery. Going on the average waiting list times of 3 months, the approximate involvement in the study for each participant (recruitment, treatment and follow up) would be 10 years and 3 months.
Intervention typeProcedure/Surgery
Primary outcome measureOxford Knee Score: a patient based validated and effective measure of change over time questionnaire. Both the absolute and the change scores will be analysed at 5- and 10-year points post-operation.
Secondary outcome measures1. American Knee Society Score: to measure the range of motion and function of the knee, measured at 2 months, 1, 5 and 10 years post-surgery
2. UCLA Activity Score: to measure how active the patient is, measured at 2 months, 1, 5 and 10 years post-surgery
3. X-ray to check for immediate problems, assess the outcome of surgery, complications and make long-term predictions, measured at 2 months, 1, 5 and 10 years post-surgery
4. EQ-5D: to provide data for the economic evaluation, measured at 2 months, 1, 2, 3, 4, 5, 7 and 10 years post-surgery
5. Lund Score: to measure patient satisfaction, measured at 2 months, 1, 2, 3, 4, 5, 7 and 10 years post-surgery
6. Other outcomes, e.g., kinematic and gait assessments, measured at 2 months, 1, 5 and 10 years post-surgery
Overall study start date01/11/2009
Overall study end date31/12/2018

Eligibility

Participant type(s)Patient
Age groupAdult
SexBoth
Target number of participants500
Total final enrolment528
Participant inclusion criteria1. Medial osteoarthritis with exposed bone on both femur and tibia or avascular necrosis
2. Functionally intact anterior cruciate ligament (superficial damage or splitting is acceptable)
3. Full thickness lateral cartilage
4. Correctable intra-articular varus deformity (suggestive of functionally intact medical cruciate ligament)
5. Medically fit showing an American Society of Anaesthesiologists (ASA) grade 1 or 2
6. Expectancy of over 10 years of active life
7. Aged 40 years or over, either sex
Participant exclusion criteria1. Require revision knee replacement surgery
2. Have rheumatoid arthritis or other inflammatory disorders
3. Are likely to benefit from a specific prosthesis type
4. Are unlikely to be able to perform required clinical assessment tasks
5. Have symptomatic foot, hip or spinal pathology
Recruitment start date01/01/2010
Recruitment end date30/09/2013

Locations

Countries of recruitment

  • England
  • Northern Ireland
  • Scotland
  • United Kingdom
  • Wales

Study participating centres

Nuffield Department of Orthopaedic, Rheumatology & Musculoskeletal Sciences
Oxford
OX3 7LD
United Kingdom
Royal Gwent Hospital
Aneurin Bevan University Health Board
Cardiff Road
Newport
NP20 2UB
United Kingdom
Musgrave Park Hospital
Belfast Health and Social Care Trust
Stockman's Lane
Belfast
BT9 7JB
United Kingdom
Chesterfield Royal Hospital
Chesterfield Royal Hospital NHS Foundation Trust
Calow
Chesterfield
S44 5BL
United Kingdom
University Hospital of North Durham
County Durham and Darlington NHS Foundation Trust
North Road
Durham
DH1 5TW
United Kingdom
Royal Blackburn Teaching Hospital
East Lancashire Hospitals NHS Trust
Haslingden Road
Blackburn
BB2 3HH
United Kingdom
Great Western Hospital
Great Western Hospitals NHS Foundation Trust
Marlborough Road
Swindon
SN3 6BB
United Kingdom
Harrogate District Hospital
Harrogate and District NHS Foundation Trust
Lancaster Park Rd
Harrogate
HG2 7SX
United Kingdom
Hull Royal Infirmary
Hull and East Yorkshire Hospitals NHS Trust
Anlaby Road
Hull
HU3 2JZ
United Kingdom
Medway Maritime Hospital
Maidstone and Tunbridge Wells NHS Trust
Windmill Road
Gillingham
ME7 5NY
United Kingdom
Pinderfields Hospital
Mid Yorkshire Hospitals NHS Trust
Aberford Road
Wakefield
WF1 4DG
United Kingdom
Milton Keynes University Hospital
Milton Keynes University Hospital NHS Foundation Trust
Standing Way
Eaglestone
Milton Keynes
MK6 5LD
United Kingdom
Woodend Hospital
NHS Grampian
Eday Road
Aberdeen
AB15 6XS
United Kingdom
Southmead Hospital Bristol
North Bristol NHS Trust
Southmead Road
Westbury-on-Trym
Bristol
BS10 5NB
United Kingdom
The Cumberland Infirmary
North Cumbria University Hospitals NHS Trust
Newtown Road
Carlisle
CA2 7HY
United Kingdom
University Hospital of North Tees
North Tees and Hartlepool NHS Foundation Trust
Hardwick
Stockton on Tees
TS19 8PE
United Kingdom
Royal United Hospitals Bath
NHS Foundation Trust
Combe Park
Bath
BA1 3NG
United Kingdom
King’s Mill Hospital
Sherwood Forest Hospitals NHS Foundation Trust
Mansfield Road
Sutton-in-Ashfield
NG17 4JL
United Kingdom
Torbay Hospital
South Devon Healthcare NHS Foundation Trust
Lowes Bridge
Torquay
TQ2 7AA
United Kingdom
Stepping Hill Hospital
Stockport NHS Foundation Trust
Poplar Grove
Hazel Grove
Stockport
SK2 7JE
United Kingdom
Hillingdon Hospitals
The Hillingdon Hospitals NHS Trust
Pield Heath Road
Uxbridge
UB8 3NN
United Kingdom
Ipswich Hospital
Ipswich Hospital NHS Trust Heath Road
Ipswich
IP4 5PD
United Kingdom
Leicester General Hospital
University Hospitals of Leicester NHS Trust
Gwendolen House
Gwendolen Road
Leicester
LE5 4QF
United Kingdom
Royal Stoke University Hospital
University Hospitals of North Midlands NHS Trust
Newcastle Road
Stoke-on-Trent
ST4 6QG
United Kingdom
Southampton General Hospital
University Hospital Southampton NHS Foundation Trust
Tremona Road
Southampton
SO16 6YD
United Kingdom
Lincoln County Hospital
United Lincolnshire Hospitals NHS Trust
Greetwell Road
Lincoln
LN2 5QY
United Kingdom
Pilgrim Hospital Boston
United Lincolnshire Hospitals NHS Trust
Sibsey Road
Boston
PE21 9QS
United Kingdom
Yeovil District Hospital
Yeovil District Hospital NHS Foundation Trust
Higher Kingston
Yeovil
BA21 4AT
United Kingdom

Sponsor information

University of Oxford (UK)
University/education

Clinical Trials and Research Governance Unit
Manor House
John Radcliffe Hospital
Headington
Oxford
OX3 9DZ
England
United Kingdom

Phone +44 (0)1865 743002
Email heather.house@admin.ox.ac.uk
Website http://www.admin.ox.ac.uk/rso/clinical
ROR logo "ROR" https://ror.org/052gg0110

Funders

Funder type

Government

Health Technology Assessment Programme
Government organisation / National government
Alternative name(s)
NIHR Health Technology Assessment Programme, HTA
Location
United Kingdom

Results and Publications

Intention to publish date31/12/2019
Individual participant data (IPD) Intention to shareNo
IPD sharing plan summaryData sharing statement to be made available at a later date
Publication and dissemination planPlanned publications include a final report to the funding body, National Institute for Health Research (NIHR), as well as publications in high-impact peer reviewed journals. The main trial results paper is planned for 2019.
IPD sharing planThe data sharing plans for the current study are unknown and will be made available at a later date.

Study outputs

Output type Details Date created Date added Peer reviewed? Patient-facing?
Protocol article protocol 12/09/2013 Yes No
Results article early results 01/10/2017 13/05/2019 Yes No
Results article 5-year results 31/08/2019 22/07/2019 Yes No
Results article results 01/04/2020 06/05/2020 Yes No

Editorial Notes

06/05/2020: Publication reference added.
22/07/2019: Publication reference added.
13/05/2019: Publication reference and total final enrolment added.
10/10/2017: The following changes were made to the trial record:
1. The recruitment start date was changed from 01/11/2009 to 01/01/2010.
2. Trial participating centres added.
3. Publication and dissemination plan and IPD sharing statement added.
06/10/2017: The overall trial end date was changed from 31/10/2016 to 31/12/2018.
04/03/2016: Plain English summary added.
17/09/2009: The overall trial start and end dates were changed from 01/06/2009 and 01/06/2023 to 01/11/2009 and 31/10/2016, respectively.