Joint Contracture Mechanisms in Immobilized Models
Summary
Immobilisation of synovial joints initiates a cascade of pathophysiological changes culminating in contracture, a persistent reduction in passive range of motion. Early immobilisation leads to myogenic alterations, including muscle atrophy, sarcomere loss and decreased muscle length, which contribute to a myogenic component of stiffness. Concurrently, arthrogenic factors emerge as the joint capsule and periarticular tissues undergo fibrotic remodelling. Resident fibroblasts differentiate into myofibroblasts under profibrotic stimuli such as transforming growth factor-β1, laying down excessive extracellular matrix and contracting the capsule. Hypoxic conditions within the immobilised joint can trigger inflammasome activation and pyroptotic cell death, fuelling further inflammation and matrix deposition. Over time, these processes solidify into irreversible structural changes, reducing collagen turnover and hindering spontaneous recovery of motion. Animal models have delineated the temporal progression of these mechanisms, highlighting critical windows for intervention to preserve joint function and guiding potential therapies aimed at modulating inflammatory signalling, inhibiting fibrotic pathways and promoting remodelling.
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Joint Contracture Mechanisms in Immobilized Models publication trend
The graph below shows the total number of articles in joint contracture mechanisms in immobilized models across all publications each year (not limited to Nature Index journals).
Technical terms
Joint contracture: Limitation of passive range of motion in a joint caused by structural changes in muscles, capsule or connective tissue.
Arthrogenic contracture: Contracture primarily resulting from alterations in intra-articular structures such as the joint capsule or cartilage.
Myogenic contracture: Reduction in joint mobility due to changes in muscle length or composition, including atrophy or sarcomere loss.
Myofibroblast: Contractile cell type that synthesises extracellular matrix and contributes to tissue fibrosis through α-smooth muscle actin expression.
Pyroptosis: A form of inflammatory cell death mediated by gasdermin-D pore formation, leading to cytokine release and matrix remodelling.
Extracellular matrix: Network of proteins and polysaccharides that provides structural support to tissues and can become fibrotic in contracture.
References
- Platelet-rich plasma attenuates the severity of joint capsule fibrosis following post-traumatic joint contracture in rats. Frontiers in Bioengineering and Biotechnology (2023).
- Role of hypoxia-mediated pyroptosis in the development of extending knee joint contracture in rats. European Journal of Medical Research (2024).
- Contributions of biarticular myogenic components to the limitation of the range of motion after immobilization of rat knee joint. BMC Musculoskeletal Disorders (2014).
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