Early post-operative in vivo kinematics after total ankle arthroplasty using a total talar prosthesis: Three-dimensional analysis using the iterative closest point algorithm
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Abstract
Purpose
The in vivo kinematics after combined total ankle arthroplasty (TAA) remains unknown. This study evaluated and compared the three-dimensional kinematics of the talar component between standard TAA, using the talar component where only the surface of the talar dome was replaced, and combined TAA, using the iterative closest point algorithm and computed tomography (CT).
Methods
The combined TAA and standard TAA groups comprised 17 and 9 ankles, respectively. CT was performed with patients in active dorsiflexed and plantarflexed ankle positions at least 3 months post-operatively.
Results
From non-weight-bearing dorsiflexion to plantarflexion, a significant medial translation of the total talar prosthesis was observed in the combined TAA group compared with the standard TAA group. Rotation of the x-axis (inversion) and translation of the z-axis (lateral translation) were negatively correlated.
Conclusions
Combined TAA results in greater inversion of the ankle joint during plantarflexion than standard TAA.
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