The outcome of Austin Moor vs Bipolar hemiarthoplasty in elderly patients in terms of harris hip score and charnley hip score

Aim: to determine the outcome of hemiarthroplasty using unipolar and bipolar prosthesis and to evaluate their results in terms of harris hip score and charnley hip score. place and duration of study: the study was conducted at khawaja muhammad safdar medical college/allama iqbal memorial teaching hospital,sialkot from january,2010 to january,2013. methods: total 44 patients; 22 in each group were selected for the study which was conducted from january,2010 to january,2013 at khawaja muhammad safdar medical college/allama iqbal memorial teaching hospital,sialkot and were followed up for a period of 1 year to 3 years with an average follow up of 2.3 years. in unipolar group there were 14 male (63.63%) and 8 female (36.36%) where as the bipolar group had 16 male (72.72%) and 6 female (27.27%). in unipolar group right side was involved in 9 cases (64.28%) and left side in 5 cases (35.7%) while in bipolar group right side was involved in 12 patients (75%) and left side in 4 patients (25%). results: seventeen patients (36.36%) had gardon type-iii fracture and 27 patients (61.36%) had gardon type-iv fracture neck of the femur. all patients were assessed post operatively via harris hip score and charnley hip score and radiologically with special reference to fracture of implant,dislocation of implant,acetabular erosion,acetabulum protusia,loosening,calcar resorption and osteolysis. results in terms of harris hip score were excellent in 17 patients (77.26%),good in 3 patients (13.63%) and poor in 2 patients (9.09%) where as in bipolar group excellent results were obtained in 18 patients (81.81%),good in 3 patients (13.63%) and poor in 1 patient (4.54%). as per charnley hip score system; in unipolar group,satisfactory results were found in 90.9% and in bipolar group 95.44% while 9.09% poor results in unipolar and 4.54% in bipolar group. the complications observed in unipolar group were; pain 6 patients (27.27%),wound infection 5 patients (22.72%),loosing of implant 3 patients (13.63%),calcar resorption in 1 patient (4.5%) while in bipolar group pain 5 patients (22.72%),wound infection 3 patients (13.63%),loosing of implant in 2 patients (9.09%) whereas fracture of implant,dislocation,acetabulum protusia,sciatic nerve injury with foot drop was not observed in any of the groups. conclusion: short term results of hemiarthroplasy with austin moor prosthesis and bipolar prosthesis are more or less similar with slightly better results with bipolar prosthesis.