Healthcare System Transition in Kazakhstan and Its Impact on Inguinal Hernia Repair Outcomes: A Multidisciplinary Comparative Analysis of TEP, TIPP, and Open Lichtenstein Procedures

Introduction

Inguinal hernia repair (IHR) is among the most frequently performed surgical procedures worldwide, with an estimated annual volume exceeding 20 million operations. Beyond its prevalence, the condition carries a substantial socioeconomic burden, primarily affecting the quality of life and productivity of working-age individuals who often serve as the primary economic support for their households. Recent updates to international standards, specifically the HerniaSurge 2023 guidelines, provide a strong recommendation for laparoscopic techniques, such as Totally Extraperitoneal (TEP) and Transabdominal Preperitoneal (TAPP) repair. These recommendations are based on high-level evidence demonstrating accelerated functional recovery and a reduced incidence of chronic postoperative pain.^1,2

Despite this consensus, the integration of minimally invasive techniques into routine clinical practice remains inconsistent, particularly in transition economies.^3,4 In such settings, the “clinical gold standard” often encounters structural and economic barriers. In Kazakhstan, the introduction of Compulsory Social Health Insurance (CSHI) has established a hybrid financing model during a period of systemic reform.⁵ In this evolving environment, reimbursement mechanisms may inadvertently influence clinical workflows. Specifically, funding models historically predicated on bed-day occupancy can create a misalignment where rapid clinical recovery and early discharge might be perceived as an administrative disadvantage.⁶ This fiscal logic can potentially delay the adoption of evidence-based surgical innovations that prioritize patient-centered outcomes.

In this context, the present study evaluates the implementation of posterior approach repairs specifically laparoscopic TEP and open Transinguinal Preperitoneal (TIPP) as dual-value interventions aimed at restoring patient quality of life while improving institutional resource management. To address the gap between clinical performance and organizational efficiency, we introduce the SBI as an exploratory descriptive tool. The study aims to provide a multidisciplinary analysis of how transitioning from traditional anterior repair (Lichtenstein) to modern preperitoneal techniques can optimize surgical throughput and institutional turnover within a rapidly changing healthcare system.

Materials and Methods

Ethical Statement and Study Design

This study utilized a hybrid prospective - retrospective cohort design to evaluate clinical, functional, and institutional outcomes of inguinal hernia repair. The study was conducted at the Medical Center Hospital of the Presidential Affairs Administration of the Republic of Kazakhstan (Almaty, Kazakhstan) between January 2021 and December 2023.

The study protocol was approved by the Institutional Review Board of Kazakhstan’s Medical University, “Kazakhstan School of Public Health” (Protocol No. A114; approved on December 20, 2019). The study adhered to the ethical principles of the Declaration of Helsinki. Written informed consent was obtained from all patients participating in the prospective phase (12-month quality-of-life follow-up). For the retrospective collection of perioperative data, institutional records were de-identified to ensure patient confidentiality.

Patient Selection and Eligibility Criteria

The total study population consisted of 505 adult patients (age ≥18 years) diagnosed with primary unilateral inguinal hernia. Inclusion Criteria: Primary unilateral or bilateral reducible inguinal hernia; ASA (American Society of Anesthesiologists) physical status I–III; and availability of complete 12-month follow-up data. Exclusion Criteria: Recurrent hernias; emergency presentations (incarcerated or strangulated hernias); history of major pelvic or lower abdominal surgery; and patients with cognitive or linguistic barriers preventing the completion of survey instruments.

Surgical Interventions

Patients underwent one of three standardized procedures, performed by senior surgical staff with a median experience of 14 years (range 10–22 years), according to European Her-nia Society (EHS) guidelines:

Lichtenstein Open Repair (LOR): A standard anterior tension-free repair using a polypropylene mesh. This group represents the conventional open approach.

Transinguinal Preperitoneal (TIPP) Repair: An open preperitoneal technique. For this comparative analysis, TIPP is classified as an open procedure and analyzed separately from laparoscopic techniques.

Totally Extraperitoneal (TEP) Repair: A laparoscopic, minimally invasive surgery (MIS) approach performed via a three-port preperitoneal access.

Propensity Score Matching (PSM)

To minimize selection bias and control for confounding variables inherent in non-randomized studies, a matched comparative subgroup of 138 patients was extracted from the total population (N=505). A 1:1:1 nearest-neighbor matching algorithm was employed with a caliper width of 0.2 standard deviations of the logit of the propensity score. Patients were matched based on three key prognostic indicators: age, biological sex (male), and baseline symptom severity (as measured by preoperative EuraHS-QoL scores). The balance of the matched cohorts was verified using Standardized Mean Differences (SMDs), where an SMD < 0.1 was considered indicative of negligible group imbalance.

Clinical and Patient-Reported Outcome Measures (PROMs)

Clinical Outcomes

Data were collected on operative time (minutes), length of stay (LOS, days), and postoperative complications (seroma, hematoma, surgical site infection) classified according to the Clavien-Dindo system.

Functional and Quality of Life (QoL) Metrics

The European Hernia Society Quality of Life (EuraHS-QoL) questionnaire was used to assess functional recovery at 12 months postoperatively. This instrument evaluates three domains: pain intensity, activity restriction, and cosmetic dissatisfaction. Binary outcomes for “activity limitation”, “cosmetic dissatisfaction”, and “postoperative pain frequency” were derived using a predefined cutoff of >3 on a 0–10 Likert scale. The 12-month postoperative follow-up was established through a hybrid approach combining mandatory in-person clinical examinations in the outpatient department and supplementary structured telephonic questionnaires to ensure comprehensive data collection.

Economic Evaluation and Institutional Efficiency

Cost-Utility Analysis

An economic evaluation was performed from the healthcare provider (hospital) perspective. Quality-of-life scores were converted into utility weights using a validated crosswalk method to calculate Quality-Adjusted Life Years (QALYs). Direct medical costs included surgical consumables, anesthesia, and bed-day charges based on 2023 institutional rates. A 12-month time horizon was applied.

System Burden Index (SBI)

To assess resource utilization patterns, we utilized the SBI as an exploratory descriptive indicator. The SBI normalizes the mean LOS of specific subgroups (eg., specific funding models or surgical techniques) against the overall institutional mean LOS for inguinal hernia repair:

An SBI > 1.0 identifies patient cohorts or administrative channels where hospitalization duration exceeds the institutional average, potentially indicating resource consumption driven by reimbursement structures or administrative logistics rather than clinical necessity.

Statistical Analysis

Statistical analysis was conducted using IBM SPSS Statistics version 26.0. Continuous variables are reported as mean ± standard deviation (SD). For the three-group comparison, differences were assessed using one-way ANOVA with Bonferroni post-hoc tests for continuous data and Chi-square (χ2) or Fisher’s exact tests for categorical proportions. A p-value < 0.05 was considered statistically significant. For the economic model, Incremental Cost-Effectiveness Ratios (ICERs) were calculated to assess the dominance of MIS over open techniques.

Results

Baseline Patient Demographics and Clinical Characteristics

Baseline equivalence was established across the matched study groups (n=138) to ensure comparability. As demonstrated in Table 1, the Lichtenstein Open Repair (LOR), Totally Extraperitoneal (TEP), and Transinguinal Preperitoneal (TIPP) groups showed no significant differences in age (p=0.312), gender distribution (92.8% male across all groups; p=0.999), or preoperative EuraHS-QoL scores for pain (p=0.189), activity restriction (p=0.409), and cosmetic dissatisfaction (p=0.393). These results confirm that the propensity score matching successfully balanced the cohorts across key prognostic variables before intervention.

Table 1 General Characteristics and Preoperative Quality of Life Profiles (n=138)

Clinical Safety and Patient-Reported Outcomes

Postoperative outcomes demonstrated significant differences in recovery profiles between the surgical groups (Table 2). Patients in the LOR group reported a significantly higher frequency of postoperative pain at 12 months (51.8%) compared to the TEP group (26.2%, pairwise p=0.013). Functional reintegration followed a similar pattern, with 57.1% of LOR patients reporting activity limitations versus 35.7% in the TEP cohort (p=0.042). Seroma formation occurred in 4.7% (n=2) of the TEP group, 5.0% (n=2) of the TIPP group, and 3.5% (n=2) in the LOR group (p=0.892), with all cases resolving via conservative management.

Table 2 Postoperative Clinical Outcomes and Complications (n=138)

Regarding clinical safety, no major early complications or recurrences were recorded in the TEP or TIPP cohorts during the 12-month follow-up. The LOR group experienced one case of wound infection and one early recurrence. Cosmetic dissatisfaction was the most significant differentiator, reported by 76.8% of LOR patients compared to 11.9% in the TEP group and 10.0% in the TIPP group (p<0.001). Figure 1 provides a visual comparison of these functional outcomes, demonstrating the superior functional restoration profile of the TEP and TIPP techniques.

Figure 1 Comparison of Patient-Reported Outcomes (LOR, TEP, and TIPP). Radar chart illustrating functional outcomes across three dimensions: Pain, Physical Activity, and Cosmetic Defect. Values are normalized; lower scores indicate superior clinical performance. TEP (Green) and TIPP (Blue) demonstrate a concentrated inner profile, indicating marked superiority in functional restoration compared to the LOR (Red) group.

Institutional Efficiency and Economics

The analysis of the broader population (N=505) revealed that resource utilization was associated with the funding model (Table 3). Patients treated under Government Quotas experienced the longest hospital stays (8.31 ± 2.1 days), resulting in an SBI of 1.28. In contrast, Paid (Commercial) services demonstrated an SBI of 0.83.

Table 3 Resource Utilization and SBI Metrics by Funding Source (N=505)

Transitioning from the institutional mean LOS (6.47 days) to a standardized laparo-endoscopic protocol (mean TEP LOS: 1.8 days) suggests a theoretical “Bed-Day Recovery” of 4.7 days per patient. Figure 2 illustrates the cost-effectiveness plane, identifying TEP as the dominant strategy, providing maximum health utility gains at op-timal costs.

Figure 2 Cost-Effectiveness Plane of Inguinal Hernia Repair Techniques. Scatter plot representing 1,000 bootstrap simulations. The y-axis shows health utility gains (QALY equivalents) derived from EuraHS-QoL scores, and the x-axis reflects incremental direct and indirect costs in local currency units. The gray dashed line represents the Willingness-to-Pay (WTP) threshold. TEP (Green square) and TIPP (Blue triangle) are positioned in the “Cost-Effective Zone” (above the WTP threshold). TEP is identified as the dominant strategy, providing the highest health utility gains relative to incremental costs compared to Lichtenstein repair (Red circle).7–10

Discussion

The clinical results of this study reinforce the established evidence base suggesting that laparo-endoscopic (TEP) and open preperitoneal (TIPP) repairs offer superior functional recovery and lower postoperative pain compared to the Lichtenstein open anterior repair. While these clinical advantages are well-documented in international guidelines, such as the HerniaSurge 2023 consensus,¹ this study provides a novel analysis of how these outcomes intersect with institutional resource utilization and healthcare financing in a transition economy.

A notable finding, beyond the direct clinical comparisons, is the observed mean length of stay (LOS) across all techniques (6.47 days), which remains considerably higher than typically reported in European standards (often less than 24–48 hours for comparable procedures). This prolonged LOS in Kazakhstan is largely attributable to deeply entrenched legacy reimbursement models, where hospital funding is historically tied to bed-day accumulation. Furthermore, a more conservative post-surgical care culture and the current lack of widespread “Day Surgery” or rapid-discharge infrastructure in many public healthcare facilities also contribute to these extended inpatient durations, rather than specific deficiencies in pain management or anesthesia protocols.

A key finding of our analysis is the observed reduction in length of stay (LOS) associated with MIS compared to the institutional mean. The theoretical “bed-day recovery” of 4.7 days (the difference between the institutional mean of 6.47 days and the TEP mean of 1.8 days) suggests a significant opportunity for institutional capacity optimization. In urban centers like Almaty, where surgical volume is often constrained by inpatient bed turnover rather than operating room availability, the transition to standardized MIS protocols could serve as a mechanism to alleviate structural bottlenecks. However, our projections regarding increased hospital throughput remain theoretical capacity models and would require broader logistical adjustments to be realized at scale.

The socio-economic implications are particularly relevant given that 92.8% of the study cohort comprised working-age males. In the context of Kazakhstan’s labor market, faster functional recovery directly correlates with reduced productivity loss. Prolonged hospitalization and delayed vocational reintegration represent a quantifiable economic burden^11. Our results suggest that MIS is not merely a technical refinement but a value-based intervention that supports the socio-economic reintegration of surgical patients, aligning with contemporary enhanced recovery after surgery (ERAS) principles foundational to healthcare sustainability.^12,13

The exploratory analysis using the SBI identified significant disparities in resource consumption across funding channels. The SBI of 1.28 for government-funded cases (Mean LOS 8.31 days) compared to the commercial sector (SBI 0.83) indicates that public-sector hospitalization duration is 28% higher than the institutional average. This observed “implementation gap” aligns with findings by Aliyeva et al (2025), who reported significant disparities in healthcare satisfaction and delivery patterns between insured and uninsured populations in Almaty, suggesting that financing models are a primary determinant of health system performance and resource distribution in the region.¹⁴

While these results suggest that reimbursement models predicated on bed-day occupancy may inadvertently disincentivize rapid discharge, they should be interpreted with caution. Potential confounders, such as differences in patient comorbidity burden, social support factors, and administrative referral patterns between government and private sectors, were not fully adjusted for in this analysis. Nevertheless, the data support the ongoing transition in Kazakhstan toward outcome-based surgical packages to better align financial incentives with clinical recovery milestones.^15,16

Regarding clinical safety, the absence of recurrence in the TEP and TIPP cohorts over the 12-month follow-up period reflects the technical standardization of preperitoneal mesh placement.¹⁷ However, we acknowledge that a 12-month horizon is insufficient to definitively establish long-term recurrence rates. Laparo-endoscopic proficiency also provides a technical foundation for managing future surgical complexity, such as chronic pain or complex mesh issues, which are increasingly managed through minimally invasive salvage procedures.^13,18 The successful adoption of these techniques in Kazakhstan is contingent upon a professional culture of clinical accountability and the ongoing modernization of institutional protocols.¹⁹

Limitations

Several limitations must be acknowledged. First, the study was conducted at a single medical center in Almaty, which may limit the generalizability of the findings to rural or lower-tier healthcare facilities in Kazakhstan. Second, the hybrid prospective–retrospective design and non-randomized patient allocation introduce the risk of selection bias, although we utilized propensity score matching to mitigate this. Third, the study was not powered to detect significant differences in rare outcomes, such as long-term recurrence or chronic mesh infection. Finally, the (SBI) is an exploratory indicator developed for this study; it has not been externally validated and should be treated as a descriptive normalization of LOS rather than a definitive performance metric.

Conclusion

This study demonstrates that laparo-endoscopic TEP and open preperitoneal TIPP techniques provide superior functional outcomes and higher patient satisfaction compared to the Lichtenstein open repair in a transition-economy setting. Beyond individual clinical benefits, these techniques facilitate significant reductions in hospital bed-day consumption.

The findings highlight an “implementation gap” between international clinical evidence and local institutional resource utilization, particularly within government-funded sectors.²⁰ The exploratory SBI identifies public-sector resource turnover as a primary target for institutional reform. To achieve the theoretical gains in hospital throughput, healthcare policy should prioritize a shift from reimbursement logic based on bed-day occupancy toward value-based care models. Standardizing minimally invasive inguinal hernia repair is a key strategy for optimizing institutional capacity and improving the socio-economic efficiency of surgical services in Kazakhstan.