Horse Flexion Tests and Lameness Welfare

How equine flexion tests used to evaluate lameness create welfare concerns and how better diagnostic approaches are evolving.

Key Facts

Flexion tests apply pressure to horse joints and limbs for 60-90 seconds before trotting to exacerbate lameness signs
Research shows flexion tests have poor specificity - a significant proportion of sound horses also show positive results
Prolonged or forceful flexion tests cause pain in horses, particularly those with underlying pathology being identified
Flexion tests are widely used in pre-purchase examinations despite their documented limitations in diagnostic accuracy
More objective lameness assessment tools including force plates, inertial measurement units, and nerve blocks provide better diagnostic information
Veterinary guidelines increasingly recommend minimizing flexion duration and force to reduce unnecessary pain
The use of diagnostic nerve blocks to identify pain sources is considered more welfare-appropriate than repeated flexion testing

Welfare Considerations

Flexion tests illustrate a tension between veterinary practice norms and welfare-conscious care - a widely used diagnostic procedure that causes pain in a proportion of horses, with questionable diagnostic value in many contexts. The welfare harm is real: horses with joint or soft tissue pathology experience genuine pain during forceful or prolonged flexion, and positive results in sound horses can lead to unnecessary treatment or rejection in sale. The movement toward objective lameness assessment tools that do not require painful manipulation represents a welfare improvement. Veterinary culture around flexion testing is slowly changing, but advocacy for more objective and less aversive lameness assessment approaches is warranted.

What You Can Do

Discuss lameness assessment methods with your veterinarian and request minimal force and duration flexion tests
Support development and adoption of objective lameness assessment technology in equine practice
Ask equine veterinarians about their lameness assessment protocols and preferences for objective tools
Choose equine veterinarians who are familiar with and willing to use inertial measurement unit lameness evaluation
Support equine welfare research that evaluates the pain response to flexion testing and develops better alternatives