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Updated: Aug 23, 2026
The Use of Mixed Reality in Custom-Made Revision Hip Arthroplasty: A First Case Report
Published on: August 4, 2022
[The cement-free modular revision prosthesis MRP-hip revision stem prosthesis in clinical follow-up]
T Mumme1, R Müller-Rath, M Weisskopf
1Universitätsklinikum Aachen, Orthopädische Klinik, Aachen. Torsten.Mumme@GMX.de
Introduction:
We present prospective medium-term results of the modular revision prostheses "MRP-TITANIUM".
Material And Methods:
45 patients (n = 48 prostheses) were evaluated. The mean follow-up was 4.7 years (min.-max.: 1.0-9.0 years). Pre- and postoperatively the Harris hip score (differentiated to Paprosky I-III) was examined. 66.67 % of the cases had extensive bony defects (> or = Paprosky II b). By means of X-ray examinations, the stability of the prostheses, periprosthetic bone remodelling, the presence of radiolucent lines as well as bone defect regeneration were assessed postoperatively.
Results:
The mean Harris hip score improved from 25.6 preoperative to 71.4 postoperative (p < or = 0.05). In 44 cases the X-ray showed stable fixation without secondary migration. In one case the stem (stand time 2.36 years) was revised due to secondary migration (> or = 5 mm). The survival rate (Kaplan-Meier) was 97 %. Bone transplantation with consecutive defect regeneration was (n = 30) complete in all cases. In six cases (12.5 %) a postoperative dislocation occurred with subsequent successful closed reposition four times (8.3 %). In two cases (4.2 %) an open reposition was done with correction of the antetorsion angle of the prostheses.
Conclusion:
The "MRP-TITANIUM modular revision prostheses" has proved to be reliable in cases of revision surgery with extensive bony defects. The failure rate was 2.1 % for 48 prospectively examined prostheses.
Insights
The MRP-TITANIUM modular revision prosthesis demonstrated reliable outcomes in hip revision surgeries, even with significant bone defects. This study shows a high survival rate and improved patient hip scores post-operation.
Area of Science:
- Orthopedic Surgery
- Biomaterials Engineering
- Medical Device Technology
Background:
- Prospective evaluation of MRP-TITANIUM modular revision prostheses.
- Focus on medium-term results in hip revision surgery.
- Inclusion of cases with extensive bony defects (Paprosky II-III).
Purpose of the Study:
- Assess the efficacy and reliability of MRP-TITANIUM prostheses.
- Evaluate clinical and radiological outcomes in revision hip arthroplasty.
- Determine the survival rate and complication profile of the prosthesis.
Main Methods:
- Prospective study of 48 MRP-TITANIUM prostheses in 45 patients.
- Mean follow-up of 4.7 years.
- Pre- and postoperative Harris hip score assessment; radiographic evaluation of stability, bone remodeling, and defect regeneration.
Main Results:
- Significant improvement in mean Harris hip score (25.6 to 71.4, p<0.05).
- High implant survival rate of 97% with stable fixation in 44 cases.
- Complete bone defect regeneration in 30 cases; low rates of dislocation (12.5%) and revision (2.1%).
Conclusions:
- MRP-TITANIUM modular revision prostheses are reliable for revision surgery with extensive bone defects.
- The prosthesis offers good clinical outcomes and a low failure rate.
- Effective bone defect regeneration observed post-revision surgery.
