Flexion tests are widely used in equine pre-purchase examinations but generate significant controversy around their interpretation, reproducibility, and welfare impact on horses being evaluated.
Flexion test welfare raises questions that the equine veterinary profession is actively debating: the diagnostic value of a test that produces false positives in a significant proportion of sound horses must be weighed against the discomfort of prolonged forced flexion for all horses tested. A test that causes discomfort in a sound horse while providing ambiguous diagnostic information about a lame horse is difficult to justify in welfare terms. The 90-second protocol in particular is viewed by some welfare-conscious practitioners as unnecessarily prolonged given that additional time does not consistently improve diagnostic accuracy. Buyer pressure to perform extensive flexion testing (multiple joints, extended hold times) conflicts with welfare considerations. The broader pre-purchase examination welfare question - what burden is it ethical to impose on a horse to satisfy a purchaser's risk tolerance - is rarely formally addressed in equine practice guidelines.