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Early Experience with a New Porous Hemispheric Acetabular Component.
Keith R Berend1, Joanne B Adams2, Michael J Morris3
1Joint Implant Surgeons, Inc., New Albany, OH, The Ohio State University Wexner Medical Center, Columbus, OH, Mount Carmel Health System, Columbus, OH.
Surgical Technology International
|December 19, 2015
Summary
This study evaluated a new cementless acetabular system for total hip arthroplasty. Early results show good functional outcomes and a low revision rate, demonstrating the system
Area of Science:
- Orthopedic Surgery
- Biomaterials Engineering
Background:
- Advancements in cementless total hip arthroplasty (THA) focus on improved acetabular component design.
- Second-generation systems demonstrated effective congruity and porous coating, necessitating further optimization.
- Modern highly crosslinked polyethylenes require acetabular systems with enhanced locking mechanisms and range of motion.
Purpose of the Study:
- To assess the early clinical and radiographic outcomes of a third-generation cementless acetabular system (G7™).
- To evaluate the efficacy of a novel ringless barb and groove locking mechanism.
- To determine the suitability of the system for highly crosslinked polyethylene liners.
Main Methods:
- Retrospective review of 576 cementless THA cases using the G7™ Acetabular System (April 2013-March 2014).
- Analysis of patient demographics, implant characteristics, and surgical techniques.
- Assessment of functional outcomes (Harris hip score, UCLA activity scale) and radiographic findings at minimum one-year follow-up.
Main Results:
- Significant improvement in Harris hip scores (50.7 to 86.5) and UCLA activity scale (4.5 to 5.4).
- Two cases (0.3%) required cup revision due to failure of biological fixation.
- Satisfactory radiographic findings with no observed radiolucencies; no dislocations reported.
Conclusions:
- The third-generation G7™ Acetabular System demonstrates promising early outcomes in cementless THA.
- The novel locking mechanism and hemispheric shell design are compatible with modern polyethylene liners.
- Low rates of acetabular revision and dislocation suggest good biological fixation and component stability.
