Flexion tests used in pre-purchase examinations and lameness investigation have welfare implications and interpretation challenges that owners and vets should understand.
Flexion test welfare involves the discomfort of the procedure itself and the consequential welfare of horses whose lameness is correctly or incorrectly diagnosed based on test results. A horse held in forced limb flexion for 60-90 seconds experiences discomfort - the procedure is not pain-free. The more significant welfare concern is for horses whose lameness is missed because tests are not sensitive enough, or horses whose management is incorrectly altered based on false positive results. Understanding flexion test limitations helps owners and vets make better decisions: a positive flexion test indicates further investigation is warranted, not necessarily that a horse should be rested or treated before a specific diagnosis is established.