REVISION TOTAL HIP ARTHROPLASTY USING A MODULAR CEMENTLESS DISTAL FIXATION PROSTHESIS: THE ZMR(®) HIP SYSTEM....

Area of Science:

• Orthopedic Surgery
• Biomaterials Engineering

Background:

• Revision total hip arthroplasty (THA) addresses complex bone loss and implant failure.
• Cementless prostheses offer potential for long-term osseointegration.

Purpose of the Study:

• To evaluate the clinical and radiographic outcomes of the ZMR Hip System for revision THA.
• To assess the stability and osseointegration of a modular cementless distal fixation prosthesis.

Main Methods:

• Retrospective analysis of 30 revision THA cases using the ZMR Hip System.
• Evaluation of clinical results with the Harris Hip Score (HHS).
• Radiographic assessment of femoral stem migration and bone remodeling (Paprosky, Sporer, Callaghan criteria).

Main Results:

• Significant improvement in HHS from 39 to 93, indicating excellent clinical outcomes.
• No femoral stem migration exceeding 5 mm observed, confirming prosthesis stability.
• 29 hips showed favorable proximal femoral remodeling (Callaghan type B or C).

Conclusions:

• The ZMR Hip System achieved successful osseointegration and stable fixation in revision THA.
• The modular cementless prosthesis demonstrated encouraging clinical and radiographic results.
• The ZMR Hip System is a viable option for complex revision hip arthroplasty.