Using External Joint Stabilizer - Elbow (EJS-E) for treating elbow instability-biomechanical assessment and clinical...

Area of Science:

• Orthopedic Surgery
• Biomechanics
• Biomedical Engineering

Background:

• Persistent elbow instability poses significant challenges in orthopedic treatment.
• Evaluating novel stabilization techniques is crucial for improving patient outcomes.

Purpose of the Study:

• To assess the efficacy of the External Joint Stabilizer - Elbow (EJS-E) for persistent elbow instability.
• To compare the biomechanical performance of the EJS-E against internal joint stabilizers (IJS).

Main Methods:

• A cohort of 17 patients with elbow instability were treated with EJS-E.
• Clinical outcomes included range of motion, pain scores (VAS), functional scores (MEPS), and radiographic assessment (Broberg and Morrey).
• Biomechanical testing evaluated construct stiffness and maximum strength, particularly in varus loading.

Main Results:

• The EJS-E facilitated restoration of elbow flexion-extension and pronation-supination arcs.
• Patients reported improved functional scores (median MEPS 90) with minimal pain.
• Biomechanical analysis revealed the EJS-E demonstrated significantly higher stiffness and resisting force in varus loading compared to IJS.

Conclusions:

• The EJS-E, applied via a posterior approach, is a viable treatment option for persistent elbow instability.
• The device effectively restores elbow mobility and stability, offering a valuable alternative to existing methods.
• Clinical and biomechanical results support the EJS-E's role in managing complex elbow instability.