Proprioceptive acuity into knee hypermobile range in JHS
Children with Joint Hypermobility Syndrome (JHS) have reduced knee joint proprioceptive awareness. Altered proprioception at end of range in individuals with JHS is thought to contribute to recurrent joint injuries and instability. The aim of the study was to provide compare joint awareness in hyperextension and early flexion.
In a group of twenty children with JHS nine children had better awareness scores in hyperextension, and eleven flexion. The children could not see their knee movements, and movement judgment was therefore purely on proprioception, This suggests that active, weight-bearing knee joint proprioceptive awareness is as accurate when children with JHS move into hyperextension as it is when they move into flexion.
Therefore, when implementing a proprioceptive training program, clinicians should focus training throughout knee range, including into hyperextension, as improvement in proprioceptive acuity in both directions is equally required for use in functional tasks. Further research is needed to determine factors contributing to pain and instability in hypermobile range.