In 1966, Henricson, Norberg and Olsson refined the definition of CHD describing it as: «A varying degree of laxity of the hip joint permitting subluxation during early life, giving rise to varying degrees of shallow acetabulum and flattening of the femoral head, finally inevitably leading to osteoarthritis.» (info.antechimagingservices.com)
In young dogs, hip dysplasia usually is caused by conformational abnormalities that cause a «poor fit» between the head of the femur and the pelvic acetabulum, which in turn causes laxity of the hip joint. (petwave.com)
Hip Dysplasia advanced beyond the point where a Total Hip Replacement is not possible due to extensive bone being worn away along with acetabulum. (globalvetspecialists.org)