Knee Chondral Shear Injury Repair: A Biomechanical Laboratory Comparison of Suture Bridge to Chondral Pin Fixation

BACKGROUND: Delamination of chondral fragments in pediatric patients is common and is usually caused by osteochondritis dissecans (OCD) or patellar dislocations. For fragments with minimal to no bone, fixation with screws may not be ideal due to hardware prominence on the cartilage or suboptimal screw purchase, which can result in hardware migration and loss of fixation. Lower-profile chondral fixation devices may be ideal in these circumstances, such as the suture bridge fixation construct and bioabsorbable chondral pin fixation. HYPOTHESIS: Suture bridge constructs would provide superior fixation over chondral pins for chondral shear injury fragments. STUDY DESIGN: Controlled laboratory study. METHODS: tests. RESULTS: = .0421). While all suture bridge repairs remained intact, 5 of 7 chondral pin repairs fully detached by the end of biomechanical testing. CONCLUSION: Suture bridge repair demonstrated significantly higher fixation stiffness and durability compared with chondral dart repair in the pediatric cadaveric model. CLINICAL RELEVANCE: This study attempts to find the biomechanically superior construct for pediatric chondral shear injuries.