Influence of the knot position on the union of the greater trochanter after bipolar hip arthroplasty via the modified Dall approach: a prospective non-randomized study

Abstract Background In our institute, all elderly patients with displaced femoral neck fracture were treated cemented bipolar hemiarthroplasty (BHA) using the modified Dall approach. To knowledge, there are no reports on knot position of greater trochanter reattachment. The aim this study was to determine influence two positions (anterior or posterior) complications trochanter. Methods This is a prospective non-randomized conducted 95 (95 hips) from September 2013 December 2017. changed anterior posterior alternately. X-ray images obtained immediately after operation compared those at 3 months postoperatively; thereafter, status classified into three types: type A, apparent shifting and fracture; C, over 1-mm fragment; F, Results Regarding age operation, sex, BMI, size trochanteric fragment, stem type, surgeon, significant difference between groups. group, 34 hips (72.3%), 5 (10.6%), 8 (17.0%) under respectively. 44 (91.7%), 1 hip (2.1%), (6.3%) There significantly fewer in group. Conclusions improved union BHA position. Trial registration We had approved IRB hospital clinical research review committee. Retrospectively registered.