Comparison of accuracy for hip-knee-ankle (HKA) angle by X-ray and knee motion analysis system and the relationships between HKA and gait posture.

Background: The lower limb mechanical axis was used to assess the severity of knee osteoarthritis (KOA) with varus/valgus deformity and the accuracy of targeted lower limb alignment correction after operation by conventional X-rays. There are lots of parameters to assess the gait in elder patients such as velocity, stride length, step width and swing/stance ratio by knee joint movement analysis system. However, the correlation between the lower limb mechanical axis and gait parameters is not clear.

The effect of range of motion after single-level discover cervical artificial disk replacement.

Study Design: A biomechanical study of cervical artificial disk replacement (CADR).

Objective: This study aimed to investigate the range of motion (ROM) of the treated segment, the ROM of the adjacent segments, the global ROM in the sagittal plane, and the total neck ROM in the 3 cardinal planes after single-level Discover CADR.

Summary Of Background Data: CADR could theoretically preserve the motion function of the treated segment without affecting the adjacent segments significantly.

The effect of multilevel anterior cervical fusion on neck motion.

Background: Anterior cervical decompression and fusion (ACDF) procedures are successful in treating multilevel cervical radiculopathy and cervical myelopathy. It was reported that this procedure would result in a loss of cervical range of motion. However, few studies have focused on the exact impact of multilevel (more than 3 levels) ACDF on cervical range of motion.