How does a cadaver model work for testing ultrasound diagnostic capability for rheumatic-like tendon damage?

Area of Science:

• Orthopedics and Rheumatology
• Medical Imaging and Ultrasound Technology
• Anatomical Pathology and Biomechanics

Background:

• Rheumatoid arthritis (RA) commonly affects tendons, leading to characteristic damage.
• Accurate detection of RA-induced tendon lesions is crucial for patient management.
• Ultrasound (US) is a key imaging modality for assessing tendon pathology.

Purpose of the Study:

• To determine if a cadaver model with surgically induced tendon damage can serve as a surrogate for detecting RA-like tendon lesions.
• To evaluate the intraobserver and interobserver agreement in grading tendon tears using US.
• To assess the concordance between US findings and surgically created lesions in the cadaver model.

Main Methods:

• Surgically induced partial or complete tears, or no damage, in 20 fresh-frozen cadaveric ankle/foot tendons (tibialis anterior and posterior).
• Three musculoskeletal US-expert rheumatologists independently assessed tendons twice over two rounds.
• Grading of tendon damage (none, partial, complete) and assessment of US imaging quality using Likert scales.

Main Results:

• Satisfactory technical performance for US imaging quality in the cadaver models (Likert scale > 2.9).
• Good intraobserver (κ=0.62) and interobserver (κ=0.71) agreement in US grading of tendon damage.
• Acceptable concordance (70-100%) between US findings and surgically induced lesions, with higher reliability for the tibialis anterior tendon.

Conclusions:

• A cadaver model with surgically created tendon damage is a valuable tool for evaluating the metric properties of US in detecting RA tendon lesions.
• The model demonstrates good reliability and acceptable concordance, supporting its use in research and training for musculoskeletal US.
• Findings suggest potential for improved US-based diagnosis and monitoring of tendon involvement in rheumatoid arthritis.