Novel Method for Routine Ultrasound-Guided Serum Collection for Biomarker Analysis Around the Knee Joint

Area of Science:

• Biomedical engineering
• Medical diagnostics
• Biomarker research

Background:

• Systemic blood biomarkers lack sensitivity for joint-specific pathologies like osteoarthritis (OA) due to dilution.
• Synovial fluid (SF) analysis offers localized insights but is invasive and impractical for repeated monitoring.
• Current methods limit effective monitoring of joint conditions and treatment response.

Purpose of the Study:

• To introduce and evaluate a novel, less invasive ultrasound-guided venous blood sampling technique.
• To assess the feasibility of collecting joint-proximal blood samples as an alternative to SF aspiration.
• To explore the potential of this method for improved joint-specific biomarker discovery and monitoring.

Main Methods:

• Medically qualified researchers trained in ultrasound-guided venipuncture using a standardized gel model.
• Blood samples collected from the saphenous vein (SV) proximal to the knee in 32 participants.
• A tourniquet was applied proximally to enhance SV dilation for easier blood collection.

Main Results:

• Successful serum collection achieved in over 80% of participants.
• The technique demonstrated minimal adverse effects, including minor bruising and transient nerve irritation.
• Key procedural insights involved optimal site selection, pressure application, and tourniquet use.

Conclusions:

• The ultrasound-guided SV sampling technique is feasible and acceptable for localized biomarker collection.
• This method holds potential for advancing biomarker research in joint-specific conditions.
• Further validation with paired SF comparisons is necessary to confirm diagnostic utility and therapeutic applications.