The veterinarian evaluates the motion pattern of the horse visually to decide which limb is lame. When a horse unloads a limb due to pain a compensatory lameness can be seen in another limb which can be interpreted as lameness by mistake. This could be a very big problem if the wrong limb is examined and treated. The aim of this study is to investigate compensatory lameness mechanisms in clinically lame horses and see if objective motion analysis can distinguish between a primary and a compensatory lameness. The motion pattern will be measured objectively in 100 horses during lameness exams. The results from 30-40 horses, where the lameness can be localized to one limb with diagnostic analgesia, will be analyzed regarding compensatory movements in another part of the body. Increased knowledge on how the horse compensate its motion pattern when suffering from painful orthopedic diseases will improve the diagnostics which is a prerequisite for correct treatment and rehabilitation.