A Quality Improvement Project to Measure and Improve the Quality of Below-Knee Ankle Cast Application in Emergency Departments

TL;DR

This study aimed to improve the quality of below-knee ankle cast application in emergency departments through education, showing some improvement but no statistical significance.

Contribution

A reproducible quality improvement approach for ankle cast application in emergency settings using targeted education.

Findings

Initial audit showed 27.7% of casts were within the acceptable angle range (80°-100°).

After education, 37.7% of casts were within the acceptable range, with one hospital showing a 22% improvement.

Improvements were not statistically significant, but suggest potential for better outcomes with further training.

Abstract

Background

Ankle fractures are very common injuries seen in an emergency setting. Initial management involves the application of below-knee plaster casts. At our local trauma meetings, we have observed that below-knee casts are often applied incorrectly which can result in suboptimal outcomes for patients and increase the burden on plaster room services if re-application is required. This quality improvement project aimed to assess the quality of below-knee cast applications for ankle fractures in two local district general hospitals (DGHs).

Methodology

We performed a closed-loop audit utilising a retrospective analysis of patients who underwent casting for unstable ankle fractures. Two audit cycles were completed over a 90-day period across two DGHs. Working within our local orthopaedic unit, we created a targeted, multi-disciplinary educational programme led by experienced plaster technicians. Between audit cycles, we organised a single interactive session with specialist nurses in the urgent treatment centre (UTC) of our DGH while a second DGH did the same with junior doctors working in the emergency department. Both sessions demonstrated correct casting techniques and discussed the importance of a neutral ankle position for optimal patient recovery. Our audit criteria were based on AO Foundation guidance, which states that the ankle should be immobilised in a neutral plantigrade position. All patients with an unstable ankle fracture requiring immobilisation in a below-knee cast were included in the audit. We measured the angle of plantarflexion from neutral, with 90° representing a neutral angle. The angle between the axis of the tibia and the sole of the foot was measured and judged to be within an acceptable range if it was between 80° and 100°, representing a stable ankle position. The audit findings were presented in our local audit meeting.

Results

In our first audit cycle, we collected data from 65 patients across both sites (N = 32 for DGH 1 and N = 33 for DGH 2). The mean angle was 108.5° and 18 of the 65 (27.7%) patients had angles of ankle plantarflexion that were in the acceptable range (80°-100°). Following the intervention, we again collected data from 61 patients across both sites (N = 28 for DGH 1 and N = 33 for DGH 2). The mean angle was 106.2° and 23 of the 61 (37.7%) patients had an acceptable angle of ankle plantarflexion (80°-100°). Both of our outcome measures showed an improvement but were not statistically significant. The hospital that provided an educational session for the doctors showed an improvement in acceptable ankle casts of 3% while the hospital which provided an educational session for the UTC team improved by 22%.

Conclusions

We demonstrated a quantifiable approach to assess and improve the quality of below-knee cast application for ankle fractures via a single intervention that would be easily reproducible in other hospitals. We suggest further studies to investigate below-knee cast application quality and its association with patient outcomes as our data and other preliminary sources suggest that current standards are unsatisfactory.

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