Effect of needle size and type, reuse of needles, insertion speed, and removal of hair on contamination of joints with tissue debris and hair after arthrocentesis.
Authors: Adams Stephen B, Moore George E, Elrashidy Mohammed, Mohamed Ahmed, Snyder Paul W
Journal: Veterinary surgery : VS
Summary
# Editorial Summary: Needle Selection and Technique in Equine Arthrocentesis Adams and colleagues examined how needle choice and arthrocentesis technique affect contamination of equine fetlock joints using soft-tissue specimens from cadaver limbs, systematically testing needle gauge (16–22 G), needle type (sharp disposable versus spinal needles with stylet), hair removal methods (unclipped, clipped, shaved), insertion speed, and needle reuse across multiple insertions. Tissue debris was recovered in 91% of samples, whilst hair contamination occurred in 30%, revealing substantial opportunity for reducing intra-articular debris. Twenty-gauge sharp needles inserted through unclipped hair produced the lowest hair contamination; notably, larger-gauge needles, spinal needles with stylets, clipped or shaved hair, and reused needles all significantly increased contamination risk. The findings have clear practical implications: 20 G sharp needles should be the standard for routine arthrocentesis with no need for hair clipping beforehand, needle reuse must be abandoned entirely regardless of clinical convenience, and spinal needles warrant hair removal only if their use cannot be avoided. Since joint infections following arthrocentesis represent a recognised complication, adopting these evidence-based needle and technique modifications offers a straightforward means of reducing contamination-related morbidity without additional cost or complexity.
Read the full abstract on PubMed
Practical Takeaways
- •Use 20 G sharp disposable needles for equine joint arthrocentesis and never reuse needles, as reuse significantly increases joint contamination risk
- •Do not clip or shave hair before arthrocentesis when using sharp needles—leave hair unclipped to minimize hair introduction into the joint
- •If using spinal needles with stylets, clip or shave the area first to reduce long hair contamination of the joint space
Key Findings
- •Tissue contamination occurred in 91% of samples (1145/1260 wells) and hair contamination in 30% (384/1260 wells)
- •20 G sharp disposable needles with unclipped hair and single use produced least hair contamination compared to other gauges and spinal needles
- •Needle reuse, smaller gauges (16 G), spinal needles with stylets, and clipped/shaved hair significantly increased contamination odds ratios
- •Spinal needles transferred many long hairs into joint space even with unclipped hair, contrasting with sharp disposable needles