Parastomal Hernia: Rethinking Prevention and Repair in Contemporary Colorectal Surgery

Abstract

Parastomal hernia (PSH) remains the most common long-term complication following permanent stoma formation. Reported incidence exceeds 50% in long-term follow-up cohorts [1, 2]. Although many hernias remain asymptomatic, clinically significant PSH can lead to pain, stoma dysfunction, appliance-related difficulties and, in some cases, obstruction or strangulation requiring urgent intervention [1]. The condition affects quality of life and increases healthcare utilisation [3-5]. However, it remains both challenging to prevent and difficult to manage definitively.

Despite increasing interest in prophylactic and reparative strategies, there is no universally accepted standard for prevention or repair [2]. Recent randomised trials [6-10] have raised doubts about the long-term efficacy of prophylactic mesh reinforcement, whereas repair techniques continue to evolve in a landscape shaped by surgeon experience, institutional resources and patient-centred considerations. This perspective benchmarks contemporary Australian and New Zealand practice, as described in a recently published binational CSSANZ survey [11], against current international guideline recommendations for PSH prevention and repair. Areas of alignment and discordance are highlighted, and potential drivers of practice variation are explored. Based on these observations, we propose a pragmatic framework to support evidence-informed, context-sensitive decision-making.

The construction of a stoma, particularly in the emergency setting, is frequently delegated to junior trainees under supervision and training in ostomy site selection can be inconsistent [12]. Technical decisions at this point, including siting within the rectus, fascial incision configuration, trephine diameter and fixation method, influence downstream parastomal hernia risk [1, 13].

There is general agreement that the stoma should traverse the rectus abdominis muscle and that the skin marking and siting process be deliberate and protocolised [12, 14]. The fascial aperture should be calibrated to minimise tension while avoiding constriction; larger defects are associated with higher hernia risk, although precise thresholds remain uncertain [13, 15]. Although robust evidence is limited, many surgeons favour a linear vertical fascial incision and controlled trephine diameters (typically 21–25 mm for end ileostomy and 26–30 mm for end colostomy) based on principles of mechanical advantage and tissue preservation [15, 16]. A uniform approach to technical details, supported by institutional protocols, may reduce variability and optimise outcomes [12, 14].

The concept of prophylactic mesh placement at the time of end stoma formation has been examined extensively in elective end colostomy settings. Early single-centre randomised trials suggested reductions in PSH incidence with retromuscular or sublay polypropylene mesh [17, 18], informing European Hernia Society recommendations that prophylactic reinforcement may be considered in selected higher-risk patients undergoing elective end colostomy [2]. However, subsequent multicentre trials including STOMAMESH, GRECCAR-7 and the five-year STOMA-CONST follow-up of PREVENT have not demonstrated a durable reduction in PSH with prophylactic mesh [7, 8, 10]. Although the intervention was generally safe and not associated with increased mesh-related complications or stoma dysfunction, the absence of long-term efficacy has tempered enthusiasm.

As a result, contemporary Australasian practice appears correspondingly conservative. In a recent binational CSSANZ survey, routine use of prophylactic mesh at index stoma formation was uncommon, reported by fewer than 15% of colorectal surgeons [11], a pattern reflected in surgeon surveys from North America and Europe [19-21]. Where used, it is typically reserved for elective cases with perceived higher risk, most often with lightweight synthetic mesh in a retromuscular position [22], although funnel-shaped intraperitoneal placement has emerging short-term data [23], longer follow-up is awaited [24]. The divergence between guideline permissiveness and real-world uptake likely reflects the weight placed on neutral long-term multicentre trial data, uncertainty regarding optimal technique and patient selection, and variation in institutional access and downstream considerations for future repair.

Prior to considering operative repair, patients should undergo structured assessment and optimisation within a multidisciplinary framework. Specialist stoma care nurses play a central role in appliance refitting, skin care, symptom assessment and patient education and many patients can be managed satisfactorily with conservative measures. Recent data highlight the importance of stoma nurse input, expectation setting and optimisation of modifiable risk factors prior to elective repair [25]. Elective surgery should therefore be reserved for patients with persistent symptoms, recurrent appliance failure, or complications despite appropriate non-operative management. These principles align with regional survey data demonstrating low procedural volumes and heterogeneous operative approaches, supporting structured pathways and early specialist input for complex or recurrent disease [11].

When operative repair is indicated, the Sugarbaker method, which involves lateralisation of the bowel and an intraperitoneal onlay mesh, is frequently employed due to favourable recurrence rates observed in retrospective series and meta-analyses [26-28]. Extraperitoneal and hybrid approaches, including retromuscular techniques, are used selectively depending on patient anatomy, prior repairs and surgeon experience [29]. Keyhole configurations have been associated with higher recurrence in comparative studies and are increasingly reserved for selected cases in which alternative techniques are not feasible [29].

Long-term durability remains a key limitation of parastomal hernia repair. Nationwide Danish registry data demonstrate that the cumulative risk of reoperation for recurrence after PSH repair increases steadily with time, reaching approximately 40% at 15 years and is higher than for other ventral hernia subtypes [30]. These findings support structured preoperative counselling regarding realistic long-term expectations and reinforce the value of referral pathways and specialist input for complex or recurrent disease.

Minimally invasive techniques have expanded the reconstructive options available to surgeons. Laparoscopic and robotic approaches offer the potential for reduced morbidity and improved recovery, particularly in elective settings [26, 31, 32]. However, access to advanced platforms remains uneven and experience with these techniques is often limited to high-volume centres. The establishment of standardised referral pathways for complex hernia repair may help ensure that patients receive the most appropriate care based on operative complexity and institutional expertise.

Emergency presentations such as incarcerated or strangulated PSH require tailored intraoperative decision-making that prioritizes bowel viability, contamination status and preservation of future reconstructive options [1, 2, 33]. Current PSH-specific guidelines generally favor reduction and suture-based repair in the emergency setting, even in the absence of gross contamination, recognising that the use of mesh and choice of plane may complicate or limit subsequent definitive repair [2, 34].

Although randomised and meta-analytic data from broader abdominal wall hernia surgery suggest that synthetic mesh can be used safely in selected clean-contaminated fields, these findings are not parastomal hernia-specific and should be extrapolated with caution [35-37]. Surgeons may stratify their approach accordingly, reserving mesh repair for cases without resection and opting for tissue-based or staged repair strategies when contamination is present [1, 2, 33]. The role of biologic or biosynthetic mesh in contaminated settings remains uncertain, with limited high-quality data and substantial cost and several analyses report no superiority over synthetic mesh or tissue repair [36, 37].

Stoma re-siting during emergency surgery is generally avoided unless mandated by technical factors or local contamination, since relocation adds morbidity and does not reliably prevent hernia at the new site [5, 38].

Although international guidelines increasingly articulate best-practice principles for PSH prevention and repair, significant variation persists across Australasia [39]. This variation is evident in prophylactic mesh uptake, operative approach and emergency decision-making and is influenced by low procedural volumes, access to minimally invasive platforms and surgeon experience, as demonstrated in recent regional survey data [11].

Fellows and trainees may have limited exposure to elective and emergency PSH repairs during core training, raising the need for enhanced curricular inclusion, simulation and case-based learning. High-volume centres could be leveraged as regional hubs to support training, audit and research. The capture of stoma-related variables in existing colorectal registries, including stoma type, location, formation technique and repair method, may allow for longitudinal outcome evaluation and help define quality indicators.

To address these gaps, we propose a pragmatic framework for parastomal hernia prevention and repair (Figure 1). This framework integrates procedural, contextual and system-level considerations to guide surgical decision-making and support training, audit and quality improvement efforts.

Parastomal hernia remains a frequent and burdensome complication of stoma formation. Although significant technical refinements have been made in stoma construction and elective mesh-based repair has become standard practice, uncertainty persists regarding optimal prophylaxis, emergency management and standardised training. Variability in access, experience and institutional pathways across Australia and New Zealand highlights the need for practical guidance and system-level support.

We propose a pragmatic framework that integrates evidence-based principles with survey-informed insights from local surgical practice. This framework outlines technical priorities at the time of index stoma creation, operative strategies based on urgency and contamination and the importance of registry linkage and workforce development. In doing so, it seeks to align decision-making with surgical context and encourage consistent, high-quality care for patients with, or at risk of, parastomal hernia.

The authors have nothing to report.

Data sharing not applicable to this article as no datasets were generated or analysed during the current study.