Rapid Collision Detection Technique in the Evaluation of Femoroacetabular Impingement
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چکیده
INTRODUCTION: In the native hip joint, Femoroacetabular Impingement (FAI) is also recognized as a cause of hip arthritis. Correction of the underlying structural abnormality permits the patient to regain a painless functional range of motion. A 2D approach to find an abnormality by checking alpha and beta angles [1] has been used. In cam type impingement where the femoral head is aspherical, recontouring of the femoral head neck junction restoring head sphericity has been shown to improve clinical function by means of both open and arthroscopic techniques. However, the less invasive techniques are more difficult in respect to accurately and reproducibly correcting the femoral head/neck deformity. More importantly, what represents a pathological head/neck deformity has not been fully delineated as well as the pathomechanisms of FAI which lead to joint deterioration. Recent joint simulation studies using CT based HIP motion data have shown that patients with FAI have decreased flexion, internal rotation and abduction compared to normals [5]. While this information may be a useful tool in decision making as well as surgical planning for computer assisted surgery, this technique cannot account for cartilage strain which ultimately will lead to its deterioration. The purpose of our study is to determine the feasibility of performing a rapid collision detection technique of the native hip joint using a patient based CT dataset in order to evaluate FAI. We present a rapid 3D system to rapidly detect impingements and compute and visualize approximate strain..
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تاریخ انتشار 2009