A technique of needle redirection at a single craniolateral site for injection of three compartments of the equine stifle joint.

The study evaluates and supports the accuracy of a needle redirection technique used to inject three compartments of the equine stifle joint from a single craniolateral site.

Objective and Sample

• The main aim of this research was to establish the precision of a method that involves needle redirection at a single craniolateral site for the injection of three different compartments of the equine stifle joint.
• The researchers also sought to describe the external needle position and find out the exact location of the needle tip inside each joint compartment.
• The study was conducted on 24 equine cadaver stifle joints.

Procedures and Methods

• The stifle joints were placed in a tailored stand for the procedures.
• After the placement of the needle, its external position and measurements were recorded meticulously.
• Every joint compartment was injected with a mixture containing iodinated contrast medium, water, and dye. These included the medial and lateral compartments of the femorotibial joint and the femoropatellar joint.
• Verification of successful entrance into each joint compartment was done through radiography, assessment of the intra-articular location of the needle tip, and gross dissection.
• Statistical techniques such as Student t tests and an ANOVA were employed to compare means.

Results

• The overall success rate of accurate needle placement was found to be 79.1% (19 out of 24), while individual joint compartments had an accuracy of at least 87.5% (21 out of 24).
• The average needle insertion depth to access each stifle joint compartment was established as 5.71 cm.
• The mean angles of insertion, relative to the long axis of the tibia, were 82.1°, 80.3°, and 18.5° for the medial femorotibial joint compartment, lateral femorotibial joint compartment, and femoropatellar joint, respectively.

Conclusions and Clinical Relevance

• The results of this research indicated that the tested needle redirection technique is reliable and accurate for successful injection of the three compartments of the equine stifle joint.
• The findings are of high clinical relevance, as they inform the veterinary field about a proven technique for joint injections. Such injections often form part of treatments for various joint diseases and conditions in equines.