Background: Patients undergoing total ankle replacement (TAR) often have symptomatic adjacent joint arthritis and deformity. Subtalar arthrodesis can effectively address a degenerative and/or malaligned hindfoot, but there is concern that it places abnormal stresses on the TAR and adjacent joints of the foot, potentially leading to early TAR failure. This study hypothesized that ankle and talonavicular joint kinematics would be altered after subtalar arthrodesis in the setting of TAR.
Methods: Thirteen mid-tibia cadaveric specimens with neutral alignment were tested in a robotic gait simulator. To simulate gait, each specimen was secured to a static mounting fixture about a 6-degree of freedom robotic platform, and a force plate moves relative to the stationary specimen based on standardized gait parameters. Specimens were tested sequentially in TAR and TAR with subtalar arthrodesis (TAR-ST). Kinematics and range of motion of the ankle and talonavicular joint were compared between TAR and TAR-ST.
Results: There were significant differences in kinematics and range of motion between TAR and TAR-ST groups. At the ankle joint, TAR-ST had less internal rotation in early-mid stance ( < .05), with decreased range of motion in the sagittal (-2.7 degrees, = .008) and axial (-1.8 degrees, = .002) planes in early stance, and increased range of motion in the coronal plane in middle (+1.2 degrees, < .001) and late (+2.5 degrees, = .012) stance. At the talonavicular joint, there were significant differences in axial and coronal kinematics in early and late stance ( < .05). Subtalar arthrodesis resulted in significantly decreased talonavicular range of motion in all planes in early and late stance ( < .003).
Conclusion: In ankles implanted with the TAR design used in this study, kinematics of the ankle and talonavicular joint were found to be altered after subtalar arthrodesis. Aberrant motion may reflect altered contact mechanics at the prosthesis and increased stress at the bone-implant interface, and affect the progression of adjacent joint arthritis in the talonavicular joint.
Clinical Relevance: These findings may provide a correlate to clinical studies that have cited hindfoot arthrodesis as a risk factor for TAR failure.
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