Unique spatiotemporal and dynamic gait compensations in the rat monoiodoacetate injection and medial meniscus transection models of knee osteoarthritis

• Published in: Osteoarthritis and cartilage Vol. 25; no. 5; pp. 750 - 758
• Main Authors: Jacobs, B.Y, Dunnigan, K, Pires-Fernandes, M, Allen, K.D
• Format: Journal Article
• Language: English
• Published: England Elsevier Ltd 01.05.2017
• Subjects: Adaptation, Physiological; Animals; Behavior, Animal; Behavioral analysis; Biopsy, Needle; Disease Models, Animal; Gait - physiology; Gait analysis; Immunohistochemistry; Injections, Intra-Articular; Iodoacetic Acid - pharmacology; Male; Medial meniscus transection; Menisci, Tibial - drug effects; Menisci, Tibial - pathology; Menisci, Tibial - surgery; Monoiodoacetate; Osteoarthritis; Osteoarthritis, Knee - drug therapy; Osteoarthritis, Knee - pathology; Physical Conditioning, Animal; Preclinical rodent models; Random Allocation; Rats; Rats, Inbred Lew; Rheumatology; Spatio-Temporal Analysis; Preclinical rodent models; Monoiodoacetate; Behavioral analysis; Osteoarthritis; Gait analysis; Medial meniscus transection
• DOI: 10.1016/j.joca.2016.12.012
• ISSN: 1063-4584

Summary Objective In rodent osteoarthritis (OA) models, behavioral changes are often subtle and require highly sensitive methods to detect these changes. Gait analysis is one assay that may provide sensitive, quantitative measurement of these behavioral changes. To increase detection sensitivity of gait assessments relative to spatiotemporal gait collection alone, we combined our spatiotemporal and dynamic gait collection systems. Using this combined system, gait was assessed in the rat medial meniscus transection (MMT) model and monoiodoacetate (MIA) injection model of knee OA. Design 36 male Lewis rats were separated into MMT ( n  = 8), medial collateral ligament transection (MCLT) ( n  = 8), skin incision ( n  = 4), MIA injection ( n  = 8), and saline injection ( n  = 8) groups. After initiation of OA, gait data were collected weekly in each group out to 4 weeks. Results The MMT and MIA injection models produced unique pathologic gait profiles, with MMT animals developing a shuffling gait and MIA injection animals exhibiting antalgic gait. Spatiotemporal changes were also observed in the MMT model at week 1 ( P  < 0.01), but were not observed in the MIA injection model until week 3 ( P  < 0.01). Dynamic gait changes were observed in both models as early as 1 week post-surgery ( P  < 0.01). Conclusion Combined analysis of spatiotemporal and dynamic gait data increased detection sensitivity for gait modification in two rat OA models. Analyzing the combined gait data provided a robust characterization of the pathologic gait produced by each model. Furthermore, this characterization revealed different patterns of gait compensations in two common rat models of knee OA.