Paramedic Patella Reduction Reduces Hospital Transport and Dislocation Time

Optimizing the Management of Acute Patellar Dislocation

Acute patellar dislocation is a common orthopedic emergency frequently involving rupture of the medial patellofemoral ligament, the primary stabilizer against lateral displacement [1]. While conservative management is common, approximately 25% of patients experience recurrent instability, and 50% report persistent symptoms such as pain and functional limitations that diminish quality of life [2]. Surgical intervention may be indicated to improve outcomes, as data show significantly lower re-dislocation rates compared to conservative care (p = 0.023) and superior functional recovery on the Kujala score, a 100 point scale assessing patellofemoral function (89.83 versus 80.94; p = 0.017) [3]. The socioeconomic impact is also substantial, with orthopedic trauma resulting in a mean of 102.3 days absent from work and a 13% rate of employment loss at one year post-injury [4]. Traditional prehospital protocols focus on stabilization and analgesia, yet delays in definitive joint relocation may exacerbate joint morbidity, which refers to the permanent damage of articular structures and cartilage, and prolong patient distress [5]. This study evaluates whether shifting definitive relocation from the emergency department to the initial paramedic encounter improves clinical trajectories.

Evaluating Prehospital Intervention via Interrupted Time Series

The researchers conducted a retrospective study utilizing emergency medical service electronic patient care data from the state of Victoria, Australia, to assess a significant shift in prehospital orthopedic care. The study population included 1,210 consecutive patients who presented to paramedics with acute patella dislocation between September 1, 2021, and August 31, 2023. This cohort was divided into two distinct phases to evaluate the impact of a clinical protocol change: a pre-implementation group consisting of 622 patients and a post-implementation group consisting of 588 patients. In November 2022, Ambulance Victoria introduced a guideline recommending out-of-hospital patella reduction by paramedics, whereas prior care was largely limited to analgesia and stabilization during transport. To measure the impact of this intervention over the two-year study period, the authors employed an interrupted time series analysis (a statistical method used to evaluate the impact of an intervention over time by comparing longitudinal trends before and after a specific implementation date). For the practicing clinician, this analysis provides a high-resolution view of how protocol shifts in the prehospital setting translate to emergency department workload and patient distress. The researchers focused on whether the new guideline could achieve effective analgesia, defined as a reduction of 50% or more from the initial pain score, while simultaneously reducing the time patients spent with a dislocated joint. By utilizing a large, state-wide dataset, the study provides evidence on the feasibility of paramedic-led reduction, which achieved a 91.8% success rate and contributed to a median dislocation duration that was 71 minutes shorter than the pre-implementation baseline (p < 0.001).

High Success Rates and Accelerated Joint Relocation

The clinical efficacy of the paramedic-led protocol was demonstrated by a high procedural achievement rate in the field. Among the patients who underwent the procedure, the success rate of paramedic reduction attempts was 91.8%. This high level of proficiency suggests that the maneuver, which typically involves extending the knee while applying medial pressure to the patella, can be safely and effectively delegated to prehospital clinicians. For the practicing physician, these findings indicate that the vast majority of patellar dislocations can be resolved before the patient ever reaches the emergency department, potentially simplifying the subsequent clinical encounter to a confirmatory examination and discussion of follow-up care. The most significant clinical benefit observed in the study was the substantial decrease in the time patients spent in an injured state. The median estimated duration of dislocation was 71 minutes shorter among patients who received a successful reduction compared to those who did not (p < 0.001). Specifically, patients with successful reduction had a median dislocation duration of 47 minutes (interquartile range: 32 to 65 minutes). In contrast, patients without successful reduction experienced a median dislocation duration of 118 minutes (interquartile range: 96 to 157 minutes). This reduction in time to relocation is clinically relevant as it minimizes the duration of acute pain and may reduce the risk of secondary soft tissue or chondral injury, such as osteochondral fractures or articular cartilage shearing, associated with prolonged joint displacement.

Analgesic Efficacy and Reduced Procedural Burden

Patella dislocation is a common and painful form of orthopedic injury cared for by paramedics in the prehospital environment. Historically, standard care for these patients has been limited to the administration of analgesia and transport to an emergency department, a sequence that inherently delays definitive joint relocation and prolongs the duration of acute distress. To evaluate the impact of the new paramedic-led reduction protocol on patient comfort, the researchers utilized a specific metric for effective analgesia, which was defined as a reduction of 50% or more from the initial pain score. The study found that the shift toward active field reduction did not compromise pain management. Following the introduction of the guideline, there was no significant step change in the proportion of patients reporting substantial analgesia, with a marginal difference of 0.8% (95% CI -6.6%, 8.1%; p = 0.832). In addition to maintaining consistent pain control, the guideline significantly altered the procedural requirements for these patients. The researchers documented a significant reduction in the rate of intravenous access, which fell by 17.3% (95% CI -25.9%, -8.7%; p < 0.001). This decrease in invasive interventions suggests that successful joint relocation in the field may alleviate the need for the intravenous medications often required for pain management or procedural sedation in the hospital setting. Ultimately, the introduction of the guideline was associated with similar rates of effective analgesia and significant reductions in intravenous access, transport rate, and total case duration. For the practicing physician, these findings indicate that paramedic-led reduction facilitates a more efficient clinical course, achieving definitive stabilization while minimizing the necessity for invasive procedures and reducing the overall burden on emergency medical resources.

Impact on Emergency Department Utilization and Case Efficiency

Beyond the clinical benefits of immediate joint relocation, the implementation of the paramedic-led reduction guideline demonstrated a substantial impact on healthcare system utilization. The researchers observed that transport to the hospital decreased significantly by 38.4% (95% CI -48.2%, -28.7%; p < 0.001) following the introduction of the new protocol. For the practicing emergency physician, this shift represents a meaningful reduction in the volume of low-acuity orthopedic presentations, potentially alleviating emergency department crowding and allowing for the reallocation of hospital resources toward more complex cases. By successfully managing patellar dislocations in the prehospital setting, paramedics effectively transitioned a subset of patients from mandatory hospital admission to community-based recovery or outpatient follow-up. The efficiency of the emergency medical service itself also improved under the new guidelines. The study reported that the total case duration was significantly reduced by 32.9 minutes (95% CI -50.8, -15.0; p < 0.001). This metric, which measures the time from the initial dispatch of the ambulance to the moment the crew becomes available for the next call, suggests that field reduction is not only clinically effective but also operationally superior to the traditional model of analgesia followed by transport. A reduction of over half an hour per case enhances the availability of emergency units within the system, ensuring that paramedics can respond more rapidly to subsequent high-priority medical emergencies.

References

1. Pang L, Mou K, Li Y, et al. Double-Limb Graft Versus Single-Limb Graft Medial Patellofemoral Ligament Reconstruction for Recurrent Patellar Dislocation: A Meta-analysis of Randomized Controlled Trials and Cohort Studies. American Journal of Sports Medicine. 2022. doi:10.1177/03635465221130448

2. Blønd L, Askenberger M, Stephen JM, et al. Management of first‐time patellar dislocation: The ESSKA 2024 formal consensus—Part 1. Knee Surgery, Sports Traumatology, Arthroscopy. 2025. doi:10.1002/ksa.12620

3. Pavone V, Perricone E, Pirrone GS, et al. A Systematic Review Comparing Conservative and Surgical Approaches in the Management of Patellofemoral Instability. Applied Sciences. 2025. doi:10.3390/app15052585

4. O’Hara NN, Isaac M, Slobogean GP, Klazinga N. The socioeconomic impact of orthopaedic trauma: A systematic review and meta-analysis. PLoS ONE. 2020. doi:10.1371/journal.pone.0227907

5. DePhillipo NN, Larson CM, O’Neill OR, LaPrade RF. Guidelines for Ambulatory Surgery Centers for the Care of Surgically Necessary/Time-Sensitive Orthopaedic Cases During the COVID-19 Pandemic. Journal of Bone and Joint Surgery. 2020. doi:10.2106/jbjs.20.00489