Distal tibial fractures constitute approximately 7–10% of all tibial fractures and continue to present a substantial challenge to orthopaedic surgeons owing to their subcutaneous location, limited soft-tissue envelope, and relatively poor vascular supply [1,2]. The complexity of managing these injuries is further amplified by the need to achieve stable fixation while preserving local biological conditions necessary for fracture healing [3].

Historically, open reduction and internal fixation (ORIF) has been widely used to restore alignment and achieve stable fixation. However, extensive surgical dissection required during ORIF may compromise periosteal blood supply and increase the risk of wound complications, delayed union, and infection [4,5]. Recognition of these limitations has led to the development of biological fixation principles that emphasize preservation of soft tissues and fracture vascularity.

Minimally Invasive Plate Osteosynthesis (MIPO) represents one such advancement and has gained widespread acceptance for treating distal tibial fractures [6,7]. By utilizing indirect reduction techniques and percutaneous plate insertion, MIPO minimizes soft-tissue trauma while maintaining fracture stability [8]. Several studies have demonstrated encouraging results with MIPO, including lower infection rates, improved union rates, and favorable functional outcomes [9–12].

Despite growing evidence supporting MIPO, controversy remains regarding its superiority over conventional ORIF, particularly in elderly populations where osteoporotic bone quality and medical comorbidities may influence outcomes [13,14]. Comparative studies evaluating both techniques within similar patient cohorts remain relatively limited. The present study aimed to compare radiological healing, functional recovery, and complication rates between MIPO and ORIF in patients undergoing operative treatment for distal tibial fractures. We hypothesized that MIPO would result in faster fracture union, superior functional outcomes, and lower complication rates compared with ORIF.

Study Design and Setting A retrospective observational cohort study was conducted involving 45 consecutive patients treated for distal tibia fractures at a tertiary government centre. Inclusion criteria consisted of skeletally mature patients diagnosed with closed or low-grade open distal tibial metaphyseal/diaphyseal fractures who underwent surgical fixation (MIPO or ORIF). Data Collection and Variables Baseline demographic and clinical data retrieved from the institutional orthopaedic database included age, sex, side of injury, mechanism of injury (fall, road traffic accident, or twisting injury), and preoperative delay to surgery. Relevant medical comorbidities—specifically diabetes mellitus, hypertension, osteoporosis, and smoking status—were systematically recorded. Operative parameters included the surgical technique utilized (MIPO vs. ORIF) and whether concomitant fibular fixation was performed. Outcome Definitions Primary endpoints were time to clinical and radiological union (measured in weeks) and functional recovery, which was evaluated at definitive follow-up utilizing the American Orthopaedic Foot & Ankle Society (AOFAS) hindfoot scale. Secondary endpoints consisted of postoperative complications, explicitly defined as delayed union, surgical site infection (superficial or deep requiring intervention), malunion, and implant failure. Statistical Analysis Continuous variables were summarized as means with standard deviations (SD) or medians with interquartile ranges (IQR) based on normality testing (Shapiro-Wilk test). Categorical variables were presented as frequencies and percentages. Independent sample t-tests were used for normally distributed continuous data (AOFAS), while Mann-Whitney U tests were employed for non-parametric continuous data (union time). Categorical variables and complication incidences were compared using Fisher’s exact tests or Chi-square tests where appropriate. Multivariable logistic regression analysis was conducted to identify independent predictors of postoperative complications, adjusting for age, comorbidity status, and surgical technique. Statistical significance was set at p < 0.05.

Baseline Demographics and Comorbidities

The cohort comprised 45 patients (28 males, 62.2%; 17 females, 37.8%) with a mean age of 67.73 ± 5.09 years. Fractures were evenly distributed anatomically (22 right-sided, 23 left-sided). Low-energy falls constituted the predominant mechanism of injury (75.6%), reflecting the geriatric demographic, followed by road traffic accidents (15.6%) and twist injuries (8.9%). The cohort presented with a substantial comorbidity burden, including hypertension (42.2%), diabetes mellitus (35.6%), osteoporosis (28.9%), and active smoking history (17.8%). Preoperative surgical delay averaged 5.89 ± 3.14 days.

Operative Characteristics

Surgical management consisted of MIPO in 29 patients (64.4%) and conventional ORIF in 16 patients (35.6%). Concomitant fibular fixation was performed in 32 cases (71.1%) based on lateral column instability and surgeon discretion. Fibular fixation rates did not differ significantly between the MIPO and ORIF cohorts (p=0.337).

Union and Functional Outcomes

Patients managed with MIPO achieved osseous union significantly faster than those undergoing ORIF. The median time to union was 17.0 weeks (IQR 16–18) for the MIPO group versus 24.0 weeks (IQR 22–26) for the ORIF group (Mann-Whitney U, p<0.001).

Functional recovery mirrored the radiological findings. The MIPO cohort exhibited significantly superior terminal functional capabilities, achieving a mean AOFAS score of 87.31 ± 4.52, compared to 73.69 ± 3.41 in the ORIF group (p<0.001). Multivariable linear regression indicated that prolonged union time was a powerful negative predictor of final AOFAS scores.

Complication Profiles

The overall complication burden was markedly concentrated within the ORIF group (Table 2). Delayed union was pervasive following open fixation, occurring in 100% (16/16) of the ORIF cohort, while no delayed unions (0/29) were recorded in the MIPO cohort (p<0.001). Surgical site infections were identified in 5 of 16 patients (31.3%) managed with ORIF, representing a significantly higher incidence than the single infection (3.4%) observed following MIPO (p=0.016). Implant failures were rare but occurred exclusively in the ORIF group (n=2, 12.5%).

Adjusted multivariable logistic regression confirmed that the utilization of conventional ORIF was a severe independent predictor for postoperative infection (OR 14.12, 95% CI 1.34–149.09, p=0.028), even when controlling for baseline diabetic status.

TABLES

Table 1. Baseline Demographic and Operative Characteristics

Table 2. Comparison of Clinical and Functional Outcomes Between MIPO and Open Reduction

*Statistically significant (p < 0.05).

Table 3. Comparison of the Present Study with Published Literature on Distal Tibial Fracture Fixation

Open rediction 1

Open rediction 2

Closed reduction 1

Closed reduction 2

The present study demonstrates that MIPO is associated with significantly improved radiological and functional outcomes compared with conventional ORIF in the treatment of distal tibial fractures. Patients treated with MIPO experienced faster fracture healing, higher AOFAS scores, and substantially lower rates of delayed union and surgical site infection. The observed reduction in time to union among MIPO-treated patients is consistent with the biological fixation concept, which prioritizes the preservation of periosteal circulation and fracture hematoma [6,8]. Previous studies by Hazarika et al. [7], Gupta et al. [15], and Boraiah et al. [16] similarly reported union times ranging from 16 to 20 weeks following minimally invasive plating techniques. In stark contrast, extensive soft-tissue dissection during ORIF invariably compromises local vascularity and delays the biological processes necessary for primary callus formation, as evidenced by the 100% delayed union incidence in our open cohort. Functional outcomes in the present study also strongly favored MIPO. The significantly higher AOFAS scores observed in the MIPO cohort suggest a more rapid restoration of ankle mechanics and earlier mobilization. Similar findings have been reported in comparative investigations evaluating biological plating techniques across various lower extremity fractures [15–18]. Crucially, this analysis underscores a marked reduction in postoperative infection rates among patients treated with MIPO. Infection occurred in only 3.4% of MIPO cases compared with 31.3% in the ORIF group. These results align with reports by Lau et al. [19], Jain et al. [20], and Lee et al. [21], who emphasized the catastrophic potential of soft-tissue envelope disruption during distal tibial fixation. Furthermore, our logistic regression model robustly identified ORIF as an independent predictor of postoperative infection (OR 14.12), proving that extensive incisional trauma inherently magnifies septic risk regardless of baseline diabetic status. This study carries several strengths, primarily the rigorous direct comparison of two established fixation techniques utilizing validated functional outcome measures within a complex, highly-comorbid geriatric cohort. However, limitations must be acknowledged. The study was conducted at a single center utilizing a retrospective observational design, inherently introducing selection bias regarding which patients received open versus minimally invasive surgery. The relatively modest sample size, while statistically sufficiently powered to detect major outcome divergence, generated wide confidence intervals in regression modeling. Finally, long-term patient-reported outcomes extending beyond initial definitive union were not evaluated.

In the surgical management of distal tibia fractures, MIPO dramatically outperforms conventional Open Reduction and Internal Fixation. By adhering to biologic fixation principles and preserving the vulnerable soft-tissue envelope, MIPO expedites osseous union, minimizes devastating postoperative infections, and restores excellent functional ankle mechanics. Open reduction should be utilized with extreme caution in distal tibial trauma, particularly among older patients with systemic comorbidities who are at highly elevated risk for delayed union and biological failure.

Clinical Relevance

This study suggests that whenever the fracture pattern and local anatomy permit, MIPO should be considered the superior operative modality to optimize recovery profiles in distal tibial fractures.

Acknowledgements

The study team and patients at Nandi Medical College and Research Institute, Chikkaballapur, are acknowledged for contributing to the clinical dataset.

Author Contributions

Study conception and data interpretation: Senior Orthopaedic Investigator. Data curation and analysis planning: Orthopaedic Research Team. Manuscript drafting and revision: Orthopaedic Author Group.

Funding

No external funding was received for this research.

Conflict of Interest

The authors declare that they have no conflicts of interest.

Data Availability Statement

The underlying dataset is available from the corresponding author upon reasonable request, subject to institutional policy and ethics approval.

Ethics Statement

This study was conducted in accordance with the Declaration of Helsinki. Approval was obtained from the Institutional Ethics Committee of Nandi Medical College and Research Institute.

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