To evaluate the early clinical effect of the reconstruction of severe Gross dislocation of acetabular bone in the reconstruction of hip arthroplasty.

From October 2012 to May 2016, 17 cases of hip arthroplasty were performed in the Second Hospital of Shanxi Medical University. There were six males and 11 females, aged from 49 to 78 years, (68±7) years on average. Inclusion criteria: unilateral primary revision (normal opposite hip joint); the reasons for renovation were aseptic loosening; Gross Ⅲ type and Gross Ⅳ patients using Jumbo cup renovations. Exclusion criteria: ischemic osteonecrosis; the contact area between the prosthesis and the host bone is less than 30%; any loss of visit for any reason. The complications, Harris score, the change of the external angle of the acetabulum, and the acetabular rotation center were observed. Paired t test was performed for preoperative and postoperative measurement indexes using SPSS.22.0 software.

All the patients were followed up. One patient experienced postoperatively hip dislocation postoperatively on the 5^th day, which was resolved after a closed reduction and a 4-week skin traction treatment. Until the end of the follow-up, the dislocation did not recur. There was no infection, loosening or other complications. The Harris hip score was (32.8±4.8) preoperatively and (87.1±4.7) postoperatively (t=62.46, P <0.05). Acetabular abduction angle variation was less than 4°, displacement of acetabulum was less than 4 mm. The preoperative acetabular center (vertical distance and horizontal distance) comparing with the data of last follow-up showed a statistically significant difference (t=10.95; t=5.53; all P<0.05). At the last follow-up, the difference in acetabular rotation center location between the contralateral side and ipsilateral side was not statistically significant (t=1.78, P>0.05; t=0.44, P>0.05). After the operation, the rotational acetabular center returned to normal comparing with the healthy side.

The contact area of the host bone can be increased by tantalum metal Jumbo cup, the prosthesis implantation technique is simple with less bone graft, the rotation center can be restored to the maximum, and the bone cup can regenerate rapidly, which suggest that early clinical efficacy can be achieved.