Variables Affecting Thigh Girth Measurement and Observer Reliability in Dogs

Area of Science:

• Veterinary Surgery
• Canine Orthopedics
• Biomechanical Measurement

Background:

• Accurate limb measurements are crucial for assessing surgical outcomes in veterinary orthopedics.
• Standardized techniques for thigh girth measurement in dogs are needed to ensure reliable data collection.
• Previous studies have not fully explored the impact of stifle position and measurement location on thigh girth reliability.

Purpose of the Study:

• To identify variables affecting thigh girth measurements in dogs.
• To evaluate inter- and intra-observer reliability of thigh girth measurements.
• To determine optimal conditions for consistent and accurate thigh girth assessment in canine stifle surgery.

Main Methods:

• Ten dogs underwent experimental cranial cruciate ligament transection and stifle stabilization.
• Thigh girth was measured at 50% and 70% of thigh length (TL) with the stifle in flexed, standing, and extended positions.
• Measurements were taken pre- and post-surgery, with and without sedation, and with clipped and unclipped hair, using a standardized spring tension tape measure.

Main Results:

• Thigh girth was significantly greater at 50% TL compared to 70% TL (P = 0.001).
• Full stifle extension resulted in significantly less thigh girth (P = 0.006).
• Measurements were highly reliable between observers (ICC > 0.98) when the stifle was in the extended position.

Conclusions:

• Thigh girth measurement is a potentially useful outcome measure in canine stifle surgery when standardized techniques are employed.
• Optimal measurement involves the extended stifle position at 70% thigh length in lateral recumbency, with the dog relaxed or sedated.
• Further research is recommended to validate these findings across diverse clinical scenarios.