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This study is performed to evaluate lower extremity alignment by a three-dimensional method using computed radiography, and the biomechanical characteristics of normal knee is also discussed. In a diagnosis of the lower extremity, an X-ray image of the anteroposterior view of the whole lower extremity is ordinarily used. However, this view is unfeasible for detecting rotational or torsional parameters for lower extremity alignment and in addition, measurement values are influenced by the posture of the lower extremity. In diagnosing and probing the biomechanical characteristics of normal knee, it is necessary to evaluate and analyze the lower extremity in a three-dimensional system not affected by the posture of the lower extremity. In addition, it is important to detect the rotational parameters in a standing position. A three-dimensional lower extremity alignment analysis system using anteroposterior and 60-degree oblique computed radiography images in a standing position was developed, and the established anatomical coordinate systems and clinical assessment parameters were defined for comparison of individual data. Assessments were made of the lower extremity alignment of sixty-seven volunteers in the adult group including thirty-four males and thirty-three females. The following characteristics were quantitatively demonstrated in the normal group; the femur and tibia showed anterior shaft bowing, mainly. The femoro-tibial angle was from 175 to 178 degrees, and the knee flexion angle was from 5 to 7 degrees, The medial knee joint-space inclination was narrower 1 degree than lateral one. The mechanical axis passed through the medial-anterior of the tibial plateau. The femoral anteversion angle was from 24 to 31 degrees, the knee rotation angle was from 14 to 19 degrees of external rotation, and the tibial torsion angle was 7 degrees of external rotation. In the present study, the biomechanical characteristics of a normal knee was demonstrated in three dimensions.
新潟国際情報大学の論文
2001-03-19

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