Meniscal tears are a common orthopedic injury, yet their healing is difficult to assess post-operatively. This impedes clinical decisions as the healing status of the meniscus cannot be accurately determined non-invasively. Thus, the objectives of this study were to explore the utility of a goat model and to use quantitative magnetic resonance imaging (MRI) techniques, histology, and biomechanical testing to assess the healing status of surgically induced meniscal tears. Adiabatic T1ρ, T2, and T2* relaxation times were quantified for both operated and control menisci ex vivo. Histology was used to assign healing status, assess compositional elements, and associate healing status with compositional elements. Biomechanical testing determined the failure load of healing lesions. Adiabatic T1ρ, T2, and T2* were able to quantitatively identify different healing states. Histology showed evidence of diminished proteoglycans and increased vascularity in both healed and non-healed menisci with surgically induced tears. Biomechanical results revealed that increased healing (as assessed histologically and on MRI) was associated with greater failure load. Our findings indicate increased healing is associated with greater meniscal strength and decreased signal differences (relative to contralateral controls) on MRI. This indicates that quantitative MRI may be a viable method to assess meniscal tears post-operatively.
Bibliographical noteFunding Information:
The authors thank: Paula Overn for her technical assistance with histology; and Djaudat Idiyatullin and Jinjin Zhang for their assistance in preparing the MRI sequences. Funding support was provided by the National Institute for Arthritis and Musculoskeletal and Skin Diseases (K01AR070894 and R01AR70020), the National Institutes of Health Office of Research Infrastructure Programs (K01OD021293), the National Institute for Biomedical Imaging and Bioengineering (P41EB015894), the National Institute for Child Health and Development (K12HD073945), and the W. M. Keck Foundation.
© 2021, The Author(s).
Center for Magnetic Resonance Research (CMRR) tags