Robotic-Arm Assisted Total Hip Arthroplasty Results in Smaller Acetabular Cup Size in Relation to the Femoral Head Size: A Matched-Pair Controlled Study
Authors: Suarez-Ahedo C, Gui C, Martin TJ, Chandrasekaran S, Lodhia P, Domb BG
Journal: Hip Int. 2017 Mar 31;27(2):147–152
Background
Robotic-assisted THA (RTHA) offers precise component placement. This study compares acetabular cup sizing relative to femoral head size in RTHA vs conventional THA (CTHA) to evaluate bone preservation.
Methods
57 matched pairs undergoing THA for primary OA. Patients were matched for age, sex, BMI, surgical approach, and femoral head size. The relative cup size was used to assess acetabular bone resection.
Key Findings
- Cup size relative to femoral head was significantly smaller in the RTHA group (p < 0.02).
- No differences in absolute cup size or patient demographics.
- Suggests improved bone preservation in RTHA.
Conclusions
RTHA may better preserve acetabular bone stock, which could benefit long-term implant survival and future revision options.
What Does This Mean for Providers?
- Consider RTHA in younger or active patients where bone preservation is a priority.
- Improved implant positioning and smaller cups may translate into better long-term outcomes.
- RTHA can be especially beneficial in patients with abnormal acetabular anatomy.