KOA patients exhibited specific alterations in sensorimotor information density and direction of information flow compared with healthy controls, revealing compensatory control strategies adopted by the nervous system in response to joint dysfunction.
Key Findings
Results
KOA patients on their affected side showed significantly increased sensorimotor information density both inter-limb and intra-limb compared with healthy controls.
Fifteen KOA patients and fifteen healthy controls were recruited for gait testing.
Time-domain analysis was used to assess sensorimotor information density.
The increase was statistically significant (p < 0.05) for both inter-limb and intra-limb comparisons.
Muscle activity and proprioceptive inputs were obtained via musculoskeletal model simulations combined with EMG signal processing.
Results
The direction of information flow from muscle activity to proprioceptive feedback was significantly increased in KOA patients on the affected side compared with healthy controls.
Time-domain analysis revealed the directional change in information flow.
The increase was statistically significant (p < 0.05).
This finding suggests an altered neuromuscular control mechanism in KOA patients.
The sensorimotor information flow was analyzed between muscles around the knee joint and proprioceptive feedback.
Results
Frequency-domain analysis revealed significantly altered inter-limb and intra-limb coordination patterns in KOA patients, characterized by increased spindle-model information density.
The increase in spindle-model information density was statistically significant (p < 0.05).
Spindle-model information density reflects muscle spindle proprioceptive feedback.
These alterations were identified specifically during the stance phase of gait.
The frequency-domain analysis complemented the time-domain findings to provide a more complete picture of sensorimotor changes.
Results
GTO-model inter-limb information density was significantly decreased in KOA patients during stance compared with healthy controls.
The decrease in Golgi tendon organ (GTO)-model inter-limb density was statistically significant (p < 0.05).
This finding was identified during the stance phase of the gait cycle.
The decreased GTO-model density contrasted with the increased spindle-model density, suggesting differential alterations in the two proprioceptive feedback pathways.
Frequency-domain analysis was used to detect this pattern.
Methods
The study used a combination of musculoskeletal model simulations and EMG signal processing to obtain muscle activity and proprioceptive inputs.
Fifteen KOA patients and fifteen healthy controls were recruited.
Proprioceptive inputs were modeled using musculoskeletal simulations (spindle model and GTO model).
EMG signal processing was used to obtain muscle activity data.
Sensorimotor information flow was analyzed in both time- and frequency-domains to capture spatiotemporal interaction patterns.
Discussion
The authors interpreted the altered sensorimotor information patterns in KOA patients as evidence of compensatory control strategies adopted by the nervous system in response to joint dysfunction.
KOA patients exhibit proprioceptive deficits and changes in neuromuscular control that may lead to functional motor impairment.
The characteristic changes identified were suggested to 'inform the future development of individualized rehabilitation interventions.'
Both increased information density and altered directionality of flow were considered reflective of compensatory mechanisms.
The findings were framed as reflecting 'changes in neuromuscular control mechanisms' rather than purely mechanical gait changes.
What This Means
This research examined how the nervous system coordinates muscle activity and sensory feedback from the knee during walking in people with knee osteoarthritis (KOA). Fifteen KOA patients and fifteen healthy individuals walked while researchers recorded muscle electrical activity (EMG) and used computer models to estimate signals from two types of sensory receptors in the muscles — muscle spindles (which detect stretch) and Golgi tendon organs (which detect force). The team then analyzed how information flowed between muscles and these sensory receptors, both in terms of timing and frequency content.
The study found that KOA patients showed distinctly different patterns of sensorimotor communication compared to healthy controls. On the affected side, the overall amount of sensorimotor information exchanged — both between the two limbs and within the same limb — was significantly higher, and information was flowing more strongly from muscle activity toward proprioceptive feedback. In the frequency analysis, muscle spindle-related signals showed increased information density, while Golgi tendon organ signals between the two limbs were decreased during the stance phase (when the foot is on the ground).
This research suggests that people with knee osteoarthritis don't simply move differently — their nervous systems actively reorganize how they process and exchange sensory and motor information during walking. The authors interpret these changes as compensatory strategies the brain and spinal cord adopt to cope with a damaged joint. These findings could potentially help researchers design more targeted rehabilitation programs that address not just muscle weakness or joint pain, but also the altered sensory-motor communication patterns that develop with osteoarthritis.
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Zhang Q, Gao Y, Hu G, Zhang K, Zhang H, Yan S. (2026). Spatiotemporal structuration of sensorimotor information during walking in knee osteoarthritis patients.. Gait & posture. https://doi.org/10.1016/j.gaitpost.2026.110233