Using the simple locking intramedullary (SLIM) system for bone deformity stabilization: A retrospective cohort study

Osteogenesis imperfecta (OI) is characterized by bone fragility and deformities. Treating long bone fractures and deformities in OI patients typically involves intramedullary (IM) rods. The Simple Locking Intramedullary (SLIM) nail is a novel surgical device developed to address challenges in patients with narrow medullary canals, which are unsuitable for larger telescoping rods. This study aims to evaluate the outcomes and complications associated with SLIM nail use in pediatric patients with OI.

A retrospective chart review was conducted at our institution, analyzing 23 patients (41 limbs) who underwent surgery using the SLIM nail between April 2016 and March 2022. Data on patient demographics, surgical intervention, post-operative outcomes, and complications were collected. Radiological evaluations were performed from the immediate post-operative period up to the most recent follow-up.

The SLIM nail demonstrated a 2-year survival rate of 82.8% and a 4-year survival rate of 77.1% in tibial applications. The most common complication was angular deformity in the distal tibia, occurring in 19 patients. Other complications included anterior cortical penetration, nail bending, and one case of nail breakage.

The SLIM nail is a viable option for patients with narrow intramedullary canals, particularly in cases where telescoping rods are not feasible. While the SLIM nail provides adequate stabilization and reduces the need for multiple surgeries, careful monitoring is essential to manage complications such as distal angular deformity. Early revision to a larger rod, when possible, is recommended to prevent further complications as the patient grows.

Level IV.