Reamer irrigator aspirator intraoperative ruler accuracy of femoral isthmus diameter

Keivan Abtahi, Zachary Nollin, Jake Checketts, Nasir Mushtaq, Brent Norris

Research output: Contribution to conferencePoster


Introduction: Over the past two decades, bone graft harvest with the Reamer Irrigator Aspirator (RIA) from the femoral canal has grown in popularity. Intra-operative measurement of the femoral canal is taken with a metallic ruler (RIA ruler) in conjunction with C-arm fluoroscopy.

Research Question/Hypothesis: Our study aims to evaluate the accuracy of the RIA ruler in judging the femoral canal diameter compared to two other measurements.

Study Design: Utilizing 6 fresh frozen human cadavers, each cadaveric femur is imaged in the operative suite in the supine position with C-Arm fluoroscopy. The femoral diameter is then measured with the RIA ruler in AP and lateral plane at all three reference points by multiple surgeons. CT scans of each individual femur were then performed. The cadaveric femurs were then transected at all the guide pins and direct caliper measurements were taken in the AP and Lateral plane.

Results: There was no significant difference in mean AP diameter measured by CT canal measurement and Canal Caliper measurement (p=0.6276). Our AP measurements using the RIA ruler were similar to those of both the CT canal and canal caliper (13.000mm vs 12.167mm vs 12.439mm) respectively. Additionally, our lateral measurements were very similar between the RIA ruler and CT canal (14.644mm vs 14.606mm), however lateral RIA ruler measurements were significantly different than the canal caliper method (14.644mm vs 11.947mm).

Conclusion: Our results suggest we are able to reliably estimate the femoral canal size near the isthmus with the RIA ruler on both the AP and Lateral images compared to the CT scan measurements.
Original languageAmerican English
StatePublished - 22 Aug 2020
EventOklahoma State University Center for Health Sciences Research Day 2019 - Oklahoma State University Center for Health Sciences, TULSA, United States
Duration: 21 Feb 201922 Feb 2019


ConferenceOklahoma State University Center for Health Sciences Research Day 2019
Abbreviated titleResearch Day 2019
Country/TerritoryUnited States
Internet address


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