UK cohort study to investigate the prevention of parastomal hernia

ISRCTN ISRCTN17573805
DOI https://doi.org/10.1186/ISRCTN17573805
Secondary identifying numbers CPMS 35821
Submission date
27/11/2017
Registration date
01/02/2018
Last edited
27/09/2024
Recruitment status
No longer recruiting
Overall study status
Completed
Condition category
Surgery
Prospectively registered
Protocol
Statistical analysis plan
Results
Individual participant data
Record updated in last year

Plain English Summary

Background and study aims
During abdominal surgery, it is sometimes necessary to create a stoma (an opening) to divert faeces from the bowel into an external pouch or bag. Unfortunately, the formation of the stoma can be associated with future complications, including the risk of developing a parastomal hernia (PSH). A PSH is an incisional hernia, immediately adjacent and related to the stoma that occurs when the fascia (a band of connective tissue) in the abdominal wall splits. Contents of the abdomen, e.g. fatty tissue or intestine, can be forced through the split in the fascia causing a bulge in the skin. PSH are relatively common and affect approximately 40% of patients within 2 years of their bowel surgery. Complications of PSH can be severe and are known to negatively influence patients’ quality of life. Specifically, PSH can make it difficult to attach stoma bags which can cause the bag contents to leak and smell, irritate the surrounding skin and make patients anxious and avoid social situations. PSH can also cause pain and serious problems, e.g. bowel obstruction, which need emergency treatment in hospital. PSH are difficult to manage and in most cases treatment involves specialist stoma care with expensive appliances. In some cases, a surgeon may reoperate to repair the hernia but additional surgery is risky and recurrence of a hernia is not uncommon. Therefore, it is very important to prevent a PSH forming in the first place. Both patient and surgical factors are believed to influence the development of PSH. Of the surgical factors, the size and shape of the incision in the body wall, the use of mesh when the stoma is formed and, if mesh is used, exactly how it is used, have all been described as potentially important considerations. However, the way in which surgeons create stomata is very varied and research is needed to investigate whether these factors influence the risk of developing a PSH. The aim of this study is to establish the incidence of PSH over a period of two years and to evaluate the effects of key technical surgical steps that influence the risks of PSH formation.

Who can participate?
Adults aged 18 and older who are undergoing a surgery to create a stoma.

What does the study involve?
Participants are approached about the study before their surgery by a stoma care nurse or other appropriately trained and qualified member of the direct care team and given a patient information leaflet. Once the participant has consented, baseline details will be collected prior to their surgery and the participant is asked to complete a baseline questionnaire. Details about their surgery are collected by the surgical team in theatre. Post-operative data is collected by the stoma care nurses or research nurses at discharge. Participants are asked to complete questionnaires at set intervals (about 6 weeks after surgery and then at 6, 12, 18 and 24 months after surgery). Participants are given the option to complete the questionnaires by post or online. If the participant agrees, they may continue to complete the 6 monthly questionnaires up to the end of the whole study period (at 30, 36, 42 and 48 months after surgery). The questionnaires include quality of life questionnaires and questionnaires about symptoms relating to their stoma. Participants are also asked if they have been admitted to hospital or had a CT scan since their last questionnaire. Any CT scans the participant has had are requested from the hospital and reviewed by surgical trainees. Participants also consent for details to be collected from NHS Digital and databases containing records of contacts with stoma care nurses and stoma products prescribed periodically throughout the study.

What are the possible benefits and risks of participating?
There are no direct benefits or risks with participating. This is because nothing about their operation or aftercare will change. We simply wish to collect details about their surgery and recovery to better understand why some patients develop parastomal hernias and others do not. This information will be very useful to the NHS and future patients.

Where is the study run from?
This study is being run by University of Bristol (UK) and takes place in hospitals in the UK.

When is the study starting and how long is it expected to run for?
October 2016 to January 2024

Who is funding the study?
National Institute for Health Research (UK)

Who is the main contact?
Miss Lucy Ellis (Scientific)
cipher-study@bristol.ac.uk

Contact information

Miss Lucy Ellis
Scientific

CIPHER Study Coordination Team
University of Bristol
Bristol Trials Centre
1-5 Whiteladies Road
Bristol
BS8 1NU
United Kingdom

ORCiD logoORCID ID 0000-0001-8179-5172
Phone +44 (0)117 455 9216
Email Cipher-study@bristol.ac.uk

Study information

Study designObservational cohort study
Primary study designObservational
Secondary study designCohort study
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 titleThe CIPHER study: UK Cohort study to Investigate the prevention of Parastomal HERnia
Study acronymThe CIPHER study
Study hypothesisCurrent study hypothesis as of 30/04/2024:

The CIPHER study aims to establish the incidence of symptomatic and clinically confirmed PSH during a minimum of 2 years follow up. Additionally, CIPHER aims to evaluate the effects of key technical surgical steps during index stoma formation on the risk of subsequent PSH formation.

_____

Previous study hypothesis:

The CIPHER study aims to establish the incidence of symptomatic and radiologically confirmed PSH during a minimum of 2 years follow up. Additionally, CIPHER aims to evaluate the effects of key technical surgical steps during index stoma formation on the risk of subsequent PSH formation.
Ethics approval(s)West Midlands - Black Country Research Ethics Committee, 08/11/2017, ref: 17/WM/0401
ConditionColorectal surgery for hernia
InterventionOnce a participant has consented, baseline details are collected prior to their index surgery and the participants are asked to complete a baseline questionnaire. Intra-operative details are collected by the surgical team. Post-operative data is collected at discharge. Participants are followed up for a minimum of 2 years post index surgery and are asked to complete questionnaires at set intervals (about 6 weeks after surgery and then 6, 12, 18 and 24 months after surgery). Participants have the option to complete the questionnaire by post or online. If the participant agrees, they may continue to complete the 6 monthly questionnaires up to the end of the whole study period (maximum 4 years).

The questionnaires include quality of life questionnaires (EQ-5D-5L & SF-12) and questionnaires to ascertain symptoms of PSH. Participants are also asked if they have been admitted to hospital or had a CT scan since their last questionnaire. Any CT scans are requested from the hospital and reviewed by surgical trainees to ascertain whether PSH is radiologically evident.

Participants consent for details to be collected from NHS Digital and databases containing records of contacts with stoma care nurses and stoma products prescribed periodically throughout the study. Patient involvement in the study finishes once all questionnaires have been submitted.
Intervention typeOther
Primary outcome measureCurrent primary outcome measure as of 30/04/2024:

PSH incidence during follow-up after index surgery to form a stoma (an incident PSH is defined as symptoms of PSH and clinical PSH) are assessed using a custom-designed questionnaire and participants’ reports of having “been told by a nurse or doctor that you have a parastomal hernia” at 6, 12, 18 and 24 months after surgery.

_____

Previous primary outcome measure:

PSH incidence during follow-up after index surgery to form a stoma (an incident PSH is defined as symptoms of PSH and anatomical PSH) are assessed using a custom-designed questionnaire and CT scans at 6 weeks and 6, 12, 18 and 24 months after surgery.
Secondary outcome measuresCurrent secondary outcome measures as of 08/09/2021:

1. Intensive care unit (ICU) stay (days) are recorded during admission for index surgery
2. Hospital stay (days) are recorded during admission for index surgery
3. Surgical site infection is measured using a questionnaire during admission for index surgery and 30 days afterward
4. Other complications are documented using the Clavien Dindo classification and the Comprehensive Complication Index at discharge
5. Symptoms of PSH are measured using a questionnaire at 12 months after index surgery
6. Generic health status is assessed using the EQ-5D-5L, SF12 scales at baseline and follow up time points: 6 weeks, 6, 12, 18, and 24 months after index surgery
7. Appointments with SCNs and advice about stoma care products
8. PSH repair is assessed using procedure codes for stoma formation in HES, information from SCNs
9. Health and social care resource use is measured using HES data at the end of the study
10. PSH identified from CT scan assessment by surgical trainees if CT scan is reported by participants in questionnaires at 6 weeks, 6, 12, 18, and 24 months after index surgery

_____

Previous secondary outcome measures:

1. Intensive care unit (ICU) stay (days) are recorded during admission for index surgery
2. Hospital stay (days) are recorded during admission for index surgery
3. Surgical site infection is measured using a questionnaire during admission for index surgery and 30 days afterwards
4. Other complications are documented using the Clavien Dindo classification and the Comprehensive Complication Index at discharge
5. Symptoms of PSH are measured using a questionnaire at 12 months after index surgery
6. Generic health status is assessed using the EQ-5D-5L, SF12 scales at baseline and follow up time points: 6 weeks, 6, 12, 18 and 24 months after index surgery
7. Appointments with SCNs and advice about stoma care products
8. PSH repair is assessed using procedure codes for stoma formation in HES, information from SCNs
9. Health and social care resource use is measured using HES data at the end of the study
Overall study start date01/10/2016
Overall study end date29/01/2024

Eligibility

Participant type(s)Patient
Age groupAdult
Lower age limit18 Years
SexBoth
Target number of participantsPlanned Sample Size: 4000; UK Sample Size: 4000
Total final enrolment2500
Participant inclusion criteria1. Aged 18 years or over
2. Able to give written informed consent
3. Undergoing elective or expedited surgery to create a stoma; either an ileostomy or colostomy
Participant exclusion criteriaCurrent exclusion criteria as of 19/12/2018:
1. Lacking the capacity to consent
2. Having emergency surgery
3. Previous abdominal wall stoma
4. Life expectancy <12 months from the index procedure
5. Having surgery with intention of forming a double-barrelled stoma
6. Having surgery with intention of forming a urostomy

Previous exclusion criteria:
1. Lacking the capacity to consent
2. Having emergency surgery
3. Previous abdominal wall stoma
4. Life expectancy <12 months from the index procedure
5. Having surgery with the intention of forming a loop ileostomy
6. Having surgery with intention of forming a double-barrelled stoma
7. Having surgery with intention of forming a urostomy
Recruitment start date11/12/2017
Recruitment end date30/06/2021

Locations

Countries of recruitment

  • England
  • Scotland
  • United Kingdom
  • Wales

Study participating centres

Royal Devon University Healthcare NHS Foundation Trust
Royal Devon University NHS Ft
Barrack Road
Exeter
EX2 5DW
United Kingdom
University Hospital Bristol NHS Foundation Trust
Upper Maudlin Street
Bristol
BS2 8HW
United Kingdom
North Bristol NHS Trust
Southmead Road
Bristol
BS10 5NB
United Kingdom
Royal Cornwall Hospitals NHS Trust
Treliske
Truro
TR1 3LQ
United Kingdom
Yeovil District Hospital NHS Foundation Trust
Yeovil Hospital
Higher Kingston
Yeovil
Somerset
BA21 4AT
United Kingdom
Royal Bolton Hospital NHS Foundation Trust
Royal Bolton Hospital
Minerva Road
Farnworth
Bolton
BL4 0JR
United Kingdom
Salisbury NHS Foundation Trust
Salisbury District Hospital
Salisbury
Wiltshire
SP2 8BJ
United Kingdom
University Hospitals of Morecambe Bay NHS Foundation Trust
Westmorland General Hospital
Burton Road
Kendal
LA9 7RG
United Kingdom
Doncaster & Bassetlaw Teaching Hospitals NHS Foundation Trust
Doncaster Royal Infirmary
Armthorpe Road
Doncaster
South Yorkshire
DN2 5LT
United Kingdom
North West Anglia NHS Foundation Trust
Peterborough City Hospital
Bretton Gate
Bretton
Peterborough
PE3 9GZ
United Kingdom
Basildon and Thurrock University Hospitals NHS Foundation Trust
Nether Mayne
Basildon
SS16 5NL
United Kingdom
Blackpool Teaching Hospitals NHS Foundation Trust
Blackpool Victoria Hospital
Whinney Heys Road
Blackpool
FY3 8NR
United Kingdom
Queen Elizabeth Hospital King's Lynn NHS Foundation Trust
Gayton Road
King's Lynn
PE30 4ET
United Kingdom
East Lancashire Hospitals NHS Trust
Royal Blackburn Teaching Hospital
Haslingden Road
Blackburn
BB2 3HH
United Kingdom
Sherwood Forest Hospitals NHS Foundation Trust
Sherwood Forest Hospitals
King's Mill Hospital
Mansfield Road
Sutton in Ashfield
NG17 4JL
United Kingdom
Warrington and Halton Hospitals NHS Foundation Trust
Warrington Hospital
Lovely Lane
Warrington
WA5 1QG
United Kingdom
University Hospitals Coventry and Warwickshire NHS Trust
University Hospital
Clifford Bridge Road
Coventry
CV2 2DX
United Kingdom
East Kent Hospitals University NHS Foundation Trust
Kent and Canterbury Hospital
Ethelbert Road
Canterbury
CT1 3NG
United Kingdom
Royal Surrey County Hospital NHS Foundation Trust
Royal Surrey County Hospital
Egerton Road
Guildford
GU2 7XX
United Kingdom
Manchester University NHS Foundation Trust (Wythenshawe Hospital)
Wythenshawe Hospital
Southmoor Road
Wythenshawe
Manchester
M23 9LT
United Kingdom
Manchester University NHS Foundation Trust (Manchester Royal Infirmary)
Manchester Royal Infirmary
Oxford Rd
Manchester
M13 9WL
United Kingdom
East and North Hertfordshire NHS Trust
Lister Hospital
Coreys Mill Lane
Stevenage
SG1 4AB
United Kingdom
Tameside and Glossop Integrated Care NHS Foundation Trust
Fountain Street
Ashton-under-Lyne
OL6 9RW
United Kingdom
Norfolk and Norwich University Hospitals NHS Foundation Trust
Colney Lane
Norwich
NR4 7UY
United Kingdom
Countess of Chester Hospital NHS Foundation Trust
The Countess Of Chester Health Park   
Chester
CH2 1UL
United Kingdom
Plymouth Hospitals NHS Trust
Derriford Road
Crownhill
Plymouth
PL6 8DH
United Kingdom
Wirral University Teaching Hospital NHS Foundation Trust
Arrowe Park Hospital
Arrowe Park Rd
Birkenhead
Wirral
CH49 5PE
United Kingdom
Colchester Hospital University NHS Foundation Trust
Colchester Hospital
Turner Road
Colchester
CO4 5JL
United Kingdom
East Cheshire NHS Trust
Macclesfield District General Hospital
Victoria Rd
Macclesfield
SK10 3BL
United Kingdom
University Hospitals Birmingham NHS Foundation Trust
Queen Elizabeth Hospital Birmingham
Mindelsohn Way
Edgbaston
Birmingham
B15 2GW
United Kingdom
Sheffield Teaching Hospitals NHS Foundation Trust
Northern General Hospital
Herries Road
Sheffield
S5 7AU
United Kingdom
Mid Cheshire Hospitals NHS Foundation Trust
Leighton Hospital Middlewich Road
Crewe
Cheshire
CW1 4QJ
United Kingdom
The Newcastle Upon Tyne Hospitals NHS Foundation Trust
Freeman Hospital
Freeman Road
High Heaton
Newcastle upon Tyne
NE7 7DN
United Kingdom
North Tees and Hartlepool NHS Foundation Trust
Hardwick Road
Stockton on Tees
Cleveland
TS19 8PE
United Kingdom
University Hospital of Wales Cardiff
Heath Park
Cardiff
CF14 4XW
United Kingdom
Kingston Hospital NHS Foundation Trust
Galsworthy Road
Kingston upon Thames
KT2 7QB
United Kingdom
United Lincolnshire Hospitals NHS Trust
Pilgrim Hospital Boston
Sibsey Road
Boston
PE21 9QS
United Kingdom
Chesterfield Royal Hospital NHS Foundation Trust
Calow
Chesterfield
S44 5BL
United Kingdom
Croydon Health Services NHS Trust
530 London Road
Thornton Heath
Croydon
CR7 7YE
United Kingdom
Ipswich Hospital NHS Trust
Heath Road
Ipswich
IP4 5PD
United Kingdom
London North West Healthcare NHS Trust
St. Mark's Hospital
Watford Road
Harrow
HA1 3UJ
United Kingdom
Cambridge University Hospitals NHS Foundation Trust
Hills Road
Cambridge
CB2 0QQ
United Kingdom
Imperial College Healthcare NHS Trust
The Bays
South Wharf Road
St Mary's Hospital
London
W2 1NY
United Kingdom
Salford Royal NHS Foundation Trust
Stott Lane
Salford
M6 8HD
United Kingdom
Poole Hospital NHS Foundation Trust
Longfleet Road
Poole
BH15 2JB
United Kingdom
Oxford University Hospitals NHS Foundation Trust
John Radcliffe Hospital
Headley Way
Headington
Oxford
OX3 9DU
United Kingdom
Barking Havering and Redbridge University Hospitals NHS Trust
Queen's Hospital
Rom Valley Way
Romford
RM7 0AG
United Kingdom
Ashford and St Peter's Hospitals NHS Foundation Trust
St Peter's Hospital
Guildford Road
Chertsey
KT16 0PZ
United Kingdom
Stockport NHS Foundation Trust
Stepping Hill Hospital
Poplar Grove
Hazel Grove
Stockport
SK2 7JE
United Kingdom
Derby Teaching Hospital NHS Foundation Trust
Uttoxeter Road
Derby
DE22 3NE
United Kingdom
City Hospitals Sunderland NHS Foundation Trust
Sunderland Royal Hospital
Kayll Rd
Sunderland
SR4 7TP
United Kingdom
Mid Yorkshire Hospital NHS Trust
Pinderfields Hospital
Aberford Road
Wakefield
WF1 4DG
United Kingdom
Raigmore Hospital Inverness (NHS Highland)
Old Perth Road
Inverness
IV2 3UJ
United Kingdom
Royal Alexandra Hospital Paisley (NHS Greater Glasgow & Clyde)
Castlehead
Paisley
PA2 9PJ
United Kingdom
Wrightington Wigan and Leigh NHS Foundation Trust
Wrightington Hospital
Hall Lane
Appley Bridge
Wigan
WN6 9EP
United Kingdom
Gateshead Health NHS Foundation Trust
Fontwell Dr
Gateshead
NE8 4YL
United Kingdom
Great Western Hospitals NHS Foundation Trust
Marlborough Road
Swindon
SN3 6BB
United Kingdom
Heart of England NHS Foundation Trust
Bordesley Green East
Birmingham
B9 5SS
United Kingdom
Nottingham University Hospitals NHS Trust
Queen's Medical Centre
Derby Road
Nottingham
NG7 2UH
United Kingdom
Morriston Hospital Swansea (ABM University Health Board)
Heol Maes Eglwys Morriston
Cwmrhydyceirw
Swansea
SA6 6NL
United Kingdom
Leeds Teaching Hospitals NHS Trust
St James's Hospital
Beckett Street
Leeds
LS9 7TF
United Kingdom
Portsmouth Hospitals NHS Trust
Queen Alexandra Hospital
Cosham
Portsmouth
PO6 3LY
United Kingdom
University Hospitals Derby and Burton NHS FT
Queens hospital
Belvedere Rd
Burton-on-Trent
DE13 0RB
United Kingdom
University Hospitals Southampton NHS Foundation Trust
Southampton General Hospital
Tremona Road
Southampton
SO16 6YD
United Kingdom
Aintree University Hospitals NHS Foundation Trust
Lower Lane
Fazakerley
Liverpool
L9 7AL
United Kingdom
Glasgow Royal Infirmary (NHS Greater Glasgow and Clyde)
84 Castle Street
Glasgow
G4 0SF
United Kingdom
Calderdale and Huddersfield NHS Foundation Trust
Huddersfield Royal Infirmary
Acre Street
Lindley
Huddersfield
HD3 3EA
United Kingdom
The Royal Wolverhampton NHS Trust
New Cross Hospital
Wolverhampton Road
Wolverhampton
WV10 0QP
United Kingdom
Dorset County Hospital NHS Foundation Trust
Williams Avenue
Dorchester
DT1 2JY
United Kingdom
Worcestershire Acute Hospitals NHS Trust
Charles Hastings Way 
Worcester
WR5 1DD
United Kingdom
Western General Hospital Edinburgh (NHS Lothian)
Crewe Rd S
Edinburgh
EH4 2XU
United Kingdom
Chelsea and Westminster Hospital NHS Foundation Trust
Chelsea and Westminster Hospital
369 Fulham Road
London
SW10 9NH
United Kingdom
University Hospitals of Leicester NHS Trust
Leicester General Hospital
Gwendolen Road
Leicester
LE5 4PW
United Kingdom
The Christie NHS Foundation Trust
Wilmslow Road
Manchester
M20 4BX
United Kingdom
South Warwickshire NHS Foundation Trust
Warwick Hospital
Lakin Road
Warwick
CV34 5BW
United Kingdom
St Helens and Knowsley Teaching Hospitals NHS Trust (Whiston Hospital)
Whiston Hospital
Warrington Rd
Rainhill
Prescot
L35 5DR
United Kingdom
Gloucestershire Hospitals NHS Foundation Trust
Gloucestershire Royal Hospital
Great Western Road
Gloucester
GL1 3NN
United Kingdom
George Elliot Hospital NHS Trust
George Eliot Hospital
College Street
Nuneaton
CV10 7DJ
United Kingdom
Medway NHS Foundation Trust
Medway Maritime Hospital
Windmill Road
Gillingham
ME7 5NY
United Kingdom

Sponsor information

Royal Devon University Healthcare NHS Foundation Trust
Hospital/treatment centre

Royal Devon & Exeter Hospital
Barrack Road
Exeter
EX2 5DW
England
United Kingdom

Funders

Funder type

Government

National Institute for Health Research
Government organisation / National government
Alternative name(s)
National Institute for Health Research, NIHR Research, NIHRresearch, NIHR - National Institute for Health Research, NIHR (The National Institute for Health and Care Research), NIHR
Location
United Kingdom

Results and Publications

Intention to publish date01/04/2026
Individual participant data (IPD) Intention to shareYes
IPD sharing plan summaryAvailable on request
Publication and dissemination planThe findings will be presented at national/international conferences, published in peer-reviewed academic journals, professional media (e.g. to SCNs) and accessible formats in newsletters to patients, in accordance with advice from the PPI group about how best to do this effectively. The findings will also be reported as a briefing paper to commissioners (e.g. commissioning groups, NICE) and to other health care stakeholders with an interest in the research.
IPD sharing planThe study data may be shared for other research (by researchers in NHS or academic institutions) relating to patients who have stomas at any time, providing the data are used for objectives that do not overlap with the CIPHER study objectives. Data relating to CIPHER study objectives may be shared for secondary research after the publication of the main results. NHS digital data (HES data) will not be shared. Data will only be shared where participants have agreed for it to be used in future ethically approved research. In all instances, sharing of anonymised individual patient data should be conditional on assurance from the researcher that the proposed use of the data is compliant with the MRC Policy on Data Preservation and Sharing regarding scientific quality, ethical requirements and value for money. A minimum requirement with respect to scientific quality will be a publicly available pre-specified protocol describing the purpose, methods and analysis of the research, e.g. a study protocol or a protocol for a Cochrane systematic review. The second file containing patient identifiers would be made available for record linkage or a similar purpose, subject to confirmation that the secondary research protocol has been approved by a UK REC or other similar, approved ethics review body.

Study outputs

Output type Details Date created Date added Peer reviewed? Patient-facing?
Protocol article 01/07/2021 09/06/2021 Yes No
Other publications What should be included in case report forms? Development and application of novel methods to inform surgical study design: a mixed methods case study in parastomal hernia prevention 05/10/2022 06/10/2022 Yes No
HRA research summary 28/06/2023 No No
Protocol file version 5.0 05/01/2024 30/04/2024 No No

Additional files

ISRCTN17573805 CIPHER_Protocol V5.0 05Jan24.pdf

Editorial Notes

27/09/2024: The intention to publish date has been changed from 01/04/2025 to 01/04/2026.
30/04/2024: The following changes were made to the trial record:
1. The primary outcome measure was changed.
2. The study hypothesis was changed.
3. The overall end date was changed from 01/12/2022 to 29/01/2024.
4. Uploaded protocol (not peer-reviewed) as an additional file.
06/10/2022: Publication reference added.
21/09/2022: The intention to publish date was changed from 31/07/2023 to 01/04/2025. IPD sharing statement added.
14/09/2022: Total final enrolment added. The overall trial end date was changed from 01/09/2022 to 01/12/2022.
13/06/2022: The scientific contact's details have been changed.
10/06/2022: The sponsor name has been changed from Royal Devon and Exeter NHS Foundation Trust to Royal Devon University Healthcare NHS Foundation Trust following a merger. The trial participating centre has been updated accordingly.
08/09/2021: The secondary outcome measures have been updated.
09/06/2021: The following changes have been made:
1. The recruitment end date has been changed from 30/06/2021 to 30/06/2021.
2. The overall trial end date has been changed from 30/04/2022 to 01/09/2022.
3. The intention to publish date has been changed from 01/12/2022 to 31/07/2023.
4. The scientific contact has been updated.
5. Publication reference added.
6. 77 Trial participating centres have been added.
8. The plain English summary has been updated to reflect the changes above.
13/07/2020: The trial contact details have been made publicly visible.
10/01/2020: The recruitment end date has been changed from 10/12/2019 to 30/06/2021.
27/03/2019: The condition has been changed from "Specialty: Surgery, Primary sub-specialty: Colorectal Surgery; UKCRC code/ Disease: Oral and Gastrointestinal/ Other diseases of the digestive system" to "Colorectal Surgery for hernia" following a request from the NIHR.
19/12/2018: The participant exclusion criteria have been changed.