# Treatment Strategies for Isolated LC-1 Pelvic Injuries: A Comparative Cohort Study of Percutaneous Posterior-Only vs. Combined Anterior–Posterior Fixation

## TL;DR

This study compares two treatment methods for a specific type of pelvic injury and finds that combined fixation may lead to better early recovery outcomes.

## Contribution

The study provides comparative evidence on the effectiveness of combined versus posterior-only fixation for LC-1 pelvic fractures.

## Key findings

- Combined fixation was associated with lower postoperative pain scores in the first six weeks.
- Patients receiving combined fixation used less opioids and had earlier physiotherapy clearance.
- Preoperative pain was higher in the combined fixation group, but postoperative outcomes were more favorable.

## Abstract

Background: The management of lateral compression type 1 (LC-1) pelvic fractures remains controversial. Posterior fixation alone has traditionally been practiced without clearly defined indications for supplementary anterior stabilization. Direct comparative evidence between posterior-only and combined anterior–posterior fixation remains scarce. This study evaluated whether institutional criteria reliably identify patients who benefit from additional percutaneous anterior fixation. Methods: A retrospective cohort study was conducted at a level I trauma center and included adults with LC-1 fractures treated exclusively by percutaneous fixation. Combined anterior–posterior fixation was performed when predominant anterior pain and radiographic compromise indicated instability. Primary outcomes were pain trajectory (Numeric Rating Scale), inpatient opioid use, physiotherapy clearance, and ward mobility. Results: Thirty-seven patients were analyzed (combined = 14; posterior-only = 23). Preoperative pain was higher in the combined group (median 7 vs. 6; median difference 1 [95% CI 0 to 2]; p = 0.0036). Postoperatively, pain scores were lower in the combined group at 1–6 weeks (median difference −1 [95% CI −2 to 0]; p < 0.05). Opioid consumption was reduced (193 mg vs. 312 mg; median difference −200 mg [95% CI −280 to −120]; p < 0.001), and physiotherapy clearance occurred earlier (4 vs. 7 days; median difference −3 [95% CI −5 to −1]; p = 0.020). Conclusion: Our current indications to perform combined fixation were associated with favorable early outcomes in pain control and physiotherapy clearance among patients with LC-1 fractures showing anterior compromise. These results support a selective combined approach, though interpretation must remain cautious given the small retrospective cohort. Further prospective studies are warranted to validate these findings and refine patient selection.