Early Outcomes of Total Cementless Hip Joint Arthroplasty with Short-Stem Prothesis

Functional tests showed an increase in mean HHS scores at 2 years post-surgery from 39.1 points (range 34-56) to 88.9 points. (range 59-100) at p=0.041. The mean VAS pain score had decreased at 2 years from a value of 8.7 to 0.81 at p=0.012. No infections, thigh pain or periarticular fractures were noted in any patient. No foci of osteolysis or radio-opaque lines around the implant were noted on radiographs. Minor asymptomatic ossification (Brooker grade 1) appeared in 2 patients. In each case, stem healing occurred through osteointegration between 6 months and 2 years post-surgery. Mean axial migration of the stem was 1.6 mm (SD 1.79 mm and range from 0 to 6mm) at p <0.05. Limb length difference reached a mean value of 6.5 mm (SD 6.7 mm with a range from -11 mm to +12 mm) at p= 0.23. Two cases required revision surgeries related to the acetabulum. Survival of the prosthesis after 2 years according to Kaplan-Meier was 98.3% and that of the stem alone was 100%Conclusions 1. These early clinical results of the Medgal-HIp short-stem endoprosthesis are comparable to data regarding other commercially available short-stem implants. 2. The results of radiological analysis together with clinical results suggest that the stem of the endoprosthesis carries minimal risk of thigh pain, peri-prosthesis fracture or excessive stem migration. 3. Due to the short follow-up period, an authoritative evaluation of the implant will be possible when the distant outcomes are available.