A survey of treatment preferences of UK surgeons in the treatment of pilonidal sinus disease

The validation of a simple and instrument-free technique to measure the depth of the natal cleft (a cohort study)

AIM

Pilonidal disease is a benign condition mainly affecting the young population. In recent literature, the depth of the natal cleft is thought to impact postoperative outcomes including wound complications and rate of recurrence. Currently there is no agreed method for measuring the depth of the natal cleft; this study proposes a novel and instrument-free technique that can be used as a research tool to measure the depth.

METHOD

This is a single centre study performed at St Mark's Hospital in London, with 63 participants volunteering to take part. Blinded repeated measurements of the natal cleft were taken by two separate clinicians to assess for inter-observer and intra-observer variation.

RESULTS

Agreement was measured and assessed by the Bland-Altman limits of agreement method and intra-class correlation (ICC). The mean difference between repeat measurements for both inter-observer and intra-observer were close to zero (-0.06 and -0.11 respectively). ICC analysis suggested a value of 0.91 for inter-observer agreement, signifying very good agreement between clinicians. Moderate intra-observer agreement was observed, with an ICC value of 0.74.

CONCLUSION

This study offers an alternative simple validated technique to measure the depth of the natal cleft, with good observer agreement. We propose that future studies aiming to analyse the depth of the natal cleft and its relationship with severity and postoperative outcomes use this technique.

Pediatric pilonidal sinus disease: Recurrence rates of different age groups compared to adults

Background

Pilonidal sinus disease uncommon in pre-pubertal children. The preferred treatment for pediatric pilonidal sinus patients remains unclear. A growing body of evidence indicates that pediatric pilonidal sinus disease recurs earlier than in adults. We therefore aimed to investigate recurrence rates and the recurrence rates of different surgical approaches.

Methods

Some 1217 studies on pilonidal sinus disease, encompassing 134,663 patients were eligible. From them, 5807 pediatric patients were identified. Recurrence rates were compared between adults and children.

Results

Pediatric pilonidal sinus patients have a higher 5-year recurrence rate compared to adults (46 % vs. 11.5 %; p < 0.0001). The subgroup of individuals aged 16-18 years appears to experience recurrences 12 months earlier than those below the age of 16. 46.4 % of all pediatric recurrences occur within 5 years.

Conclusions

Pediatric pilonidal sinus disease seems to follow a different course in terms of recurrence rate compared to adults with a substantially increased probability of developing recurrent pilonidal sinus disease within the first five years after surgery. Due to the limited evidence base, especially in terms of the surgical approach, additional data is required to gain a more detailed insight into the matter and to improve surgical care for children and adolescents.

Time trends in incidence of pilonidal sinus disease from 1996 to 2021: A Danish population-based cohort study

AIM

Pilonidal sinus disease (PSD) is a common condition, but no data on disease occurrence exist outside highly selected settings. The aim of this study was to assess time trends in the incidence of PSD in a nationwide setting.

METHOD

Using data from nationwide Danish registries, we identified 48 247 patients recorded with diagnostic or surgical procedure codes representing PSD between 1996 and 2021. We stratified by sex and computed the age-adjusted and age-specific incidence rate, comparing 5-year intervals with the incidence rate ratio (IRR).

RESULTS

The overall incidence of PSD increased from 26.1 to 39.6/100 000 person-years (PY) from the period 1996-2000 to the period 2016-2021 (IRR 1.52, 95% CI 0.78-2.94). The incidence increased from 35.8 to 56.9/100 000 PY (IRR 1.59, 95% CI 0.52-4.89) in male patients and from 16.4 to 22.5/100 000 PY (IRR 1.37, 95% CI 0.68-2.76) in female patients. The peak of age-specific incidence was 215.7/100 000 PY (95% CI 206.1-245.4) among 20-year-old men and 107.9/100.000 PY (95% CI 100.0-114.0) among 18-year-old women. Over the study period, the median age at first hospital contact decreased from 27 years [interquartile range (IQR) 22-34 years) to 25 years (IQR 20-34 years) in men but remained stable around 23 years (IQR 18-32 years) in women. However, for both sexes, the highest increase in incidence was seen in early adolescence.

CONCLUSION

The incidence of PSD has increased significantly over the last decades. The increase is driven primarily by men and boys, with the highest increase in incidence seen in early adolescence. The increased burden of disease is not reflected in the literature, and more studies are warranted to understand the drivers of this development.

Decision regret following surgical management of pilonidal disease

AIM

Surgical decision making in the context of pilonidal disease (PD) can be challenging. Current evidence for the management of PD is inadequate and optimum treatment is not clear. This paper reports on patient experience of shared decision making (SDM) and decision regret following surgical management of PD.

METHOD

The Pilonidal Trial. Studying the Treatment Options (PITSTOP) study (ISRCTN95551898) is a prospective cohort study of patients with PD treated between May 2019 and March 2022. This subanalysis reports the results of quantitative data capture between baseline and 6 months post-procedure. Baseline data consisted of patient and disease characteristics, surgical procedure and impression of SDM. Post-procedure data consisted of operative outcomes and decision regret. Multiple linear regression analysis was used to analyse the relationship between clinical outcomes and decision regret.

RESULTS

Overall, 677 patients were included, and follow-up data to 6 months were available for 476 (71%). Most (59.5%) patients underwent major excisional surgery; 45.1% of patients experienced a postoperative complication. Participant impression of SDM was positive, with a median CollaboRATE mean-score response of 3 (interquartile range: 3-4). Of the patients who underwent a 'leave open' approach, 20.6% were dissatisfied or very dissatisfied with their treatment. Postoperative complications (β = 3.21, 95% CI: -12.75 to 7.25, p < 0.001) and disease recurrence (β = 11.5, 95% CI: -10.6 to 9.4, p < 0.001) were both associated with higher rates of decision regret.

CONCLUSION

The clinical outcomes, postoperative complications and recurrence, were associated with higher levels of decision regret. Surgeons treating patients with PD should practice SDM and ensure that patient priorities inform treatment approach.

Research and practice priorities in pilonidal sinus disease: a consensus from the PITSTOP study

AIM

Pilonidal sinus disease is a common condition treated by colorectal surgeons. There is a lack of literature in the field to guide optimal management of this condition. As part of the PITSTOP study, we aimed to identify policy and research priorities to provide direction to the field.

METHOD

Patients and surgeons were invited to participate. A 'So what, now what' exercise was conducted, informed by data from PITSTOP. This generated statements for research and practice priorities. A three-round online Delphi study was conducted, ranking statements based on policy and research separately. Statements were rated 1 (not important) to 9 (important). Statements that were rated 7-9 by more than 70% of participants were entered into the consensus meeting. Personalized voting feedback was shown between rounds. A face-to-face meeting was held to discuss statements, and participants were asked to rank statements using a weighted choice vote.

RESULTS

Twenty-two people participated in the focus group, generating 14 research and 19 policy statements. Statements were voted on by 56 participants in round 1, 53 in round 2 and 51 in round 3. A total of 15 policy statements and 19 research statements were discussed in the consensus round. Key policy statements addressed treatment strategies and intensity, surgeon training opportunities, need for classification and the impact of treatment on return to work. Research recommendations included design of future trials, methodology considerations and research questions.

CONCLUSION

This study has identified research and policy priorities in pilonidal sinus disease which are relevant to patients and clinicians. These should inform practice and future research.

Classification and stratification in pilonidal sinus disease: findings from the PITSTOP cohort

AIM

Research in pilonidal disease faces several challenges, one of which is consistent and useful disease classification. The International Pilonidal Society (IPS) proposed a four-part classification in 2017. The aim of this work was to assess the validity and reliability of this tool using data from the PITSTOP cohort study.

METHOD

Face validity was assessed by mapping the items/domains in the IPS tool against tools identified through a systematic review. Key concepts were defined as those appearing in more than two-thirds of published tools. Concurrent and predictive validity were assessed by comparing key patient-reported outcome measures between groups at baseline and at clinic visit. The outcomes of interest were health utility, Cardiff Wound Impact Questionnaire (CWIQ) and pain score between groups. Significance was set at p = 0.05 a priori. Interrater reliability was assessed using images captured during the PITSTOP cohort. Ninety images were assessed by six raters (two experts, two general surgeons and two trainees), and classified into IPS type. Interrater reliability was assessed using the unweighted kappa and unweighted Gwet's AC1 statistics.

RESULTS

For face validity items represented in the IPS were common to other classification systems. Concurrent and predictive validity assessment showed differences in health utility and pain between groups at baseline, and for some treatment groups at follow-up. Assessors agreed the same classification in 38% of participants [chance-corrected kappa 0.52 (95% CI 0.42-0.61), Gwet's AC1 0.63 (95% CI 0.56-0.69)].

CONCLUSION

The IPS classification demonstrates key aspects of reliability and validity that would support its implementation.

Real-world practice and outcomes in pilonidal surgery: Pilonidal Sinus Treatment Studying The Options (PITSTOP) cohort

BACKGROUND

Numerous surgical approaches exist for the treatment of pilonidal disease. Current literature on treatment is of poor quality, limiting the ability to define optimal intervention. The aim of this study was to provide real-world data on current surgical practice and report patient and risk-adjusted outcomes, informing future trial design.

METHODS

This UK-wide multicentre prospective cohort study, including patients (aged over 16 years) who had definitive treatment for symptomatic pilonidal disease, was conducted between May 2019 and March 2022. Patient and disease characteristics, and intervention details were analysed. Data on patient-reported outcomes, including pain, complications, treatment failure, wound issues, and quality of life, were gathered at various time points up to 6 months after surgery. Strategies were implemented to adjust for risk influencing different treatment choices and outcomes.

RESULTS

Of the 667 participants consenting, 574 (86.1%) were followed up to the study end. Twelve interventions were observed. Broadly, 59.5% underwent major excisional surgery and 40.5% minimally invasive surgery. Complications occurred in 45.1% of the cohort. Those who had minimally invasive procedures had better quality of life and, after risk adjustment, less pain (score on day 1: mean difference 1.58, 95% c.i. 1.14 to 2.01), fewer complications (difference 17.5 (95% c.i. 9.1 to 25.9)%), more rapid return to normal activities (mean difference 25.9 (18.4 to 33.4) days) but a rate of higher treatment failure (difference 9.6 (95% c.i. 17.3 to 1.9)%). At study end, 25% reported an unhealed wound and 10% had not returned to normal activities.

CONCLUSION

The burden after surgery for pilonidal disease is high and treatment failure is common. Minimally invasive techniques may improve outcomes at the expense of a 10% higher risk of treatment failure.