Total hip replacements in the dog have become well established over th
e past 20 years as an effective method for treating disabling hip cond
itions. A fixed head prosthesis has been the mainstay during most of t
his period. Return to normal function with this prosthesis has been re
ported at 95 per cent. Although patient selection, pre- and post surgi
cal care, the surgical technique and the treatment or prevention of co
mplications has been continually improved, it was not until recently t
hat the prosthesis and its instrumentation were improved. Now a modula
r prosthesis with improved instrumentation gives the veterinary surgeo
n 'state of the art' implants and instruments. The prosthesis is easie
r to implant, the surgeon has greater flexibility in surgery and impro
ved results are expected. Total hip replacement continues to be an eff
ective way to give dogs a pain-free, mechanically sound hip joint.