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Objectives: To evaluate the influence of chondral lesions of the knee in function and appearance on magnetic resonance imaging (MRI) of the meniscal implant Polyurethane (Actifit®). Material and Methods: 48 patients were implanted with Actifit® by postmeniscectomía syndrome. The chondral status of their respective compartment was graded at arthroscopy with ICRS scale. Were evaluated functionally Womet, IKDC, Kujala, EVA and satisfaction (0-4). The implant characteristics were evaluated with MRI scale Genovese, assessing its correlation with the degree of chondral damage and functional outcome Results: Mean follow-up of 38 months (25-75). 16 patients had no chondral lesion, 14 had lesion grade II, 10 grade III and IV grade 9. Womet, Kujala improved IKDC and 36.2 ± 7.6, 32.3 ± 13.5 and 39.2 ± 8.1 to 75.8 ± 12.9 (p = 0.02), 75.5 ± 15.4 (p = 0.03) and 85.6 ± 13.4 (0.042), respectively. No relationship between the degree of chondral damage and functional outcome was observed. The shape and size of the implant in RM was worse with higher levels of chondral lesion (p = 0.023). A post-hoc analysis showed that this was only due to the difference between patients without chondral injury versus those with ICRS II-IV. The satisfaction was 3.6 ± 0.8 points. Conclusion: Implementing a Actifit® led to significant pain and functional improvement after a minimum follow-up of 2 years. The size and morphological MRI appearance of meniscal replacement polyurethane was better in patients without chondral lesions. No relationship between the degree of chondral damage and functional outcome was observed.

The MRI appearance of a polyurethane meniscal substitute worsens if it matches articular cartilage lesions of the knee