2019 ISAKOS Biennial Congress ePoster #1818
Biomechanical Comparison of Single- and Double-Row Repair Techniques for Acute Bony Bankart Lesions
Alexander Greenstein, MD, Rochester, NY UNITED STATES
Alexander Brown, MD, Rochester, NY UNITED STATES
Aaron Roberts, MD, Rochester, NY UNITED STATES
Raymond J. Kenney, MD, Rochester, NY UNITED STATES
Raymond Chen, MD, Rochester, NY UNITED STATES
Emma Knapp, BS, Rochester, NY UNITED STATES
Ilya Voloshin, MD, Rochester, NY UNITED STATES
University of Rochester, Rochester, NY, UNITED STATES
FDA Status Not Applicable
To examine the dynamic stability and ultimate displacement of single- vs double-row repair techniques for acute bony Bankart lesions
Single- and double-row arthroscopic reconstruction techniques for acute bony Bankart lesions have been described in the literature. Previous studies comparing single- and double-row reconstruction techniques have examined static forces required to displace the bony Bankart lesion. No studies, to date, have examined the dynamic stability and displacement. We hypothesize the double-row fixation technique would provide superior stability and decreased displacement of a simulated bony Bankart lesion throughout the healing process in a cadaveric model compared with single-row technique.
Testing was performed on 13 matched pairs of glenoids with simulated bony Bankart fractures with a defect width of 25% of the glenoid diameter. Half of the fractures were repaired with a double-row technique, while the contralateral glenoids were repaired with a single-row technique. To determine dynamic biomechanical stability and ultimate step-off of the repairs a 150N load and 2000 cycles of internal-external rotation at 1Hz was applied to specimens to simulate standard rehabilitation protocols. Toggle was quantified throughout cycling with a coordinate measuring machine. After cyclic loading, the fracture displacement was measured. 3D spatial measurements were calculated using MATLAB.
The double-row technique resulted in significantly (p=0.005) less displacement (mean=342.48 µm SD=300.64 µm) than single-row technique (mean=981.84 µm, SD=640.38 µm). Ultimate fracture displacement of double-row repair was significantly less (mean=792.23 µm, SD=333.85 µm, p=0.046) after simulated rehabilitation by internal-external rotation cycling compared to single-row repair (mean=1,267.38 µm, SD=640.38 µm).
The double-row fixation technique resulted in superior stability throughout simulated rehabilitation and decreased displacement following simulated rehabilitation in this cadaveric model.