DOS 2018

244 · DOS Abstracts Restoration of hip anatomy using a short femoral neck prosthesis in total hip arthroplasty. Anders Tjønneland, Janus Duus, Thomas Jakobsen, Mogens Laursen, Poul Torben Nielsen Ortopædkirurgisk, Aalborg Purpose / Aim of Study: To evaluate if there is any difference in hip param- eters femoral offset, femoral leg length and neck shaft angle (NSA) after total hip arthroplasty (THA) using Primoris uncemented femoral neck prosthesis, with and without use of an intraoperative guide system Materials and Methods: Femoral offset, femoral leg length and NSA on the operated hip, were compared to the contralateral anatomical hip on the pelvic x-ray taken 1 year after surgery. Measurement were made in Traumacad. 52 patients was operated using the guide (ReCap Ks Jig) and 50 patients not using the guide, 9 and 14 x-rays respectively were excluded. One surgeon operated all the patients. Functional outcome was assessed using the Harris Hip Score (HHS) Findings / Results: Compared to the contralateral hips, the operated hips fem- oral offset had a mean shortening of 2,3mm (p=0,018) with the guide, and a mean shortening of 0,7 mm (p=0,47) not using the guide. Femur length had a mean shortening of 5 mm (p=2,5*10-9) using the guide, and a mean shorten- ing of 5,9 mm (p=3,6*10-10) not using the guide. The implant was placed in 15O (p=9,2*10-14) valgus with the guide, and 13O (p=3,7*10-13) valgus without the guide. Comparing using the guide vs not using the guide operatively we found no difference in femoral offset (p=0,26), femoral length (p=0,32) and NSA (p=0,50). The HHS improved at one year after surgery, from a mean of 56 to 93 with the guide, and from 55 to 97 without the guide. There is a tendency towards, that the patients who were operated with no guide, got a higher HHS, but it was not statistical significant (p=0,08). Conclusions: There is no significant difference in femoral offset, femoral leg length and NSA, on the pelvic x-ray taken 1 year postoperatively, whether using or not using the operative guide system for positioning the Primoris hip pros- thesis. 185.

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