ISTA 2025 - Radiographic Bone Response and Clinical Evaluation at Two Years After THA Using Two Modular Cone-Type Stems

Description

The presentation discusses a comparative study of two types of modular cone-type stems used in total hip arthroplasty (THA): the MRP and the Modulus. Ryo Orito outlines their research involving 388 primary THA cases from 2007 to 2022, focusing on outcomes after a follow-up period of at least two years. Key findings include the demographic differences between groups, such as the age of patients and follow-up durations, and the assessment of clinical outcomes using JOA scores. Results indicate that both stem types display significant improvements in clinical outcomes with low complication rates and comparable coronal alignment. However, stem subsidence was notably higher in the MRP group, attributed to its shorter length, despite the mean subsidence distance being less. The discussion emphasizes the design differences and their potential implications on osteointegration and stress distribution, suggesting that while both stems are effective, the MRP stem's size and configuration may influence mechanical stability. The study concludes both stem designs achieved favorable outcomes within the two years assessed, noting a need for ongoing evaluation of long-term performance.