Joint position sense in total knee arthroplasty.

Area of Science:

• Orthopedics
• Neuroscience
• Biomechanics

Background:

• Degenerative joint disease significantly impacts joint position sense (proprioception).
• Total knee arthroplasty (TKA) aims to restore function but often results in suboptimal outcomes.
• The relationship between proprioception and functional recovery post-TKA requires further elucidation.

Purpose of the Study:

• To investigate joint position sense in patients following total knee arthroplasty (TKA).
• To compare proprioception in TKA patients with young and age-matched controls.
• To determine the correlation between joint position sense, clinical outcomes, and gait parameters in TKA patients.

Main Methods:

• Seventeen TKA patients underwent two joint position sense tests.
• Gait analysis, including foot switch stride analysis, was performed on TKA patients.
• Clinical evaluation using a standard scoring system was conducted.

Main Results:

• Joint position sense decreased significantly from young to old controls and further with joint disease.
• No significant worsening of joint position sense was observed after TKA.
• Abnormal gait parameters in TKA patients correlated with both position sense and clinical scores.
• Combined clinical and proprioceptive scores showed the strongest correlation with gait parameters.

Conclusions:

• Pre-existing loss of proprioception due to degenerative joint disease, rather than TKA, may be a primary factor limiting functional recovery.
• Impaired proprioception and resulting abnormal gait patterns post-TKA could increase stress on components, potentially leading to loosening.
• Degenerative joint disease is associated with a decline in proprioception, impacting outcomes after total knee replacement.