3D X-ray Motion Analysis of Ankle-foot Motion After Total Ankle Arthroplasty

Terminated

Brief Summary: Patients who have had a total ankle joint replacement surgery typically have limited movement in their ankles possibly due to the fact that commonly used ankle joint prosthetic devices only allow limited axes of motion.

This study will evaluate the ability of a Scandinavian Total Ankle Replacement (STAR) mobile-bearing prosthesis and INBONE 2 fixed-bearing prosthesis to restore triplanar motion in the tibiotalar (ankle) joint following a surgical arthroplasty (total joint replacement) procedure.

3D X-ray video motion analysis will be utilized to quantify range of motion measurements in two groups of ankle prosthesis users and a group of matched control participants.

Detailed Description: 15 study participants will include those using a Stryker STAR prosthesis and a Wright Medical INBONE 2 prosthesis and a group of matched control subjects.

CT scans of lower limb anatomy (ankle-foot complex) will be obtained for all subjects to be converted into 3D bone surface models for use in the joint motion tracking software.

Each participant will participate in one day of data collection with an X-Ray Motion Analysis (XMA) system. High-speed biplanar XMA system will capture video images of the skeletal motions within the foot-ankle complex during normal movement. Subjects will walk and perform controlled movements in the capture volume within the XMA system.

Following data collection, the 3D bone surface models will be mapped to the sagittal (side view), coronal (front view), and axial (top view) plane skeletal motions demonstrated in the collected x-ray videos. Motion tracking data will then be used to accurately animate the 3D bone models to demonstrate the active range of ankle-foot joint motions during voluntary movement and gait.

Resulting range of motion measurements in dorsiflexion/plantarflexion, internal/external rotation, and inversion/eversion will be used to determine the extent to which normal motion in the ankle-foot complex has been restored in ankle prosthesis users.

Recruitment & Eligibility

Inclusion Criteria

Not provided

Exclusion Criteria

Not provided

Arm && Interventions

Group	Intervention	Description
Mobile-bearing ankle prosthesis user	Total Ankle Replacement Prosthesis	Users of the Stryker Scandinavian Total Ankle Replacement (STAR) mobile-bearing prosthesis.
Fixed-bearing ankle prosthesis user	Total Ankle Replacement Prosthesis	Users of the INBONE II Total Ankle Replacement fixed-bearing prosthesis.

Primary Outcome Measures

Name	Time	Method
Tibiotalar Joint Angle Kinematics	1 year	3D range of motions of the tibiotalar (upper ankle) joint were recorded and analyzed using a biplanar x-ray motion analysis system. In particular, joint ranges of motion were tested in terms of dorsiflexion-plantarflexion, internal-external rotation, and inversion-eversion angles.

Secondary Outcome Measures

Name	Time	Method
Tibiotalar Joint Linear Translation Kinematics	1 year	3D range of linear motions of the tibiotalar (upper ankle) joint were recorded and analyzed using a biplanar x-ray motion analysis system. In particular, linear joint ranges of motion were tested in terms of the anteroposterior, mediolateral, and superior-inferior axes.