Comparative Analysis of Spatiotemporal Gait Parameters in Patients With Distal Femoral Megaprosthesis and Healthy Subjects Using an Inertial Measurement Unit (IMU)

Antero-posterior acceleration symmetry index

时间窗: 3 months

This metric serves as a quantifiable measure of the symmetry exhibited in movements along the antero-posterior axis, thereby illustrating the equilibrium and coordination inherent in the body's kinetic activities.

Stance Phase

时间窗: 3 months

Refers to the portion of the gait cycle during which a foot is in contact with the ground. It begins with the initial contact (heel strike) and ends when the same foot leaves the ground (toe-off). The stance phase is a critical component of walking and running, contributing to balance, propulsion, and weight-bearing. Measured as a percentage of the total gait cycle, 60% of the cycle in typical walking.

Swing Phase

时间窗: 3 months

Refers to the portion of the gait cycle during which a foot is not in contact with the ground. It begins when the foot lifts off the ground (toe-off) and ends when the same foot makes contact again (heel strike). The swing phase allows the leg to advance forward and position itself for the next step. Measured as a percentage of the total gait cycle, 40% of the cycle in normal walking.

Gait Quality Index

时间窗: 3 months

The stance-swing phase ratio

First Double support phase

时间窗: 3 months

Refers to the portion of the gait cycle during walking when both feet are in contact with the ground simultaneously. It occurs at the beginning of the stance phase for one leg, immediately after heel strike, and ends when the opposite foot lifts off (toe-off). This phase contributes to stability during gait. Measured as a percentage of the total gait cycle.

Single Support Phase

时间窗: 3 months

Refers to the portion of the gait cycle during which only one foot is in contact with the ground bearing the entire body weight while the other foot is in the swing phase. It is essential for maintaining balance and forward progression during walking. Measured as a percentage of the total gait cycle.

Propulsion Index

时间窗: 3 months

This measures the subject's ability to propel the centre of mass forward during the single support stance phase.

Pelvic tilt range

时间窗: 3 months

Refers to the total angular movement of the pelvis in the sagittal plane during a specific activity, such as walking. It represents the difference between the maximum anterior tilt (forward rotation) and maximum posterior tilt (backward rotation) of the pelvis within a given cycle. Measured in degrees (°) to quantify the extent of pelvic rotation.

Pelvic obliquity range

时间窗: 3 months

Refers to the total angular movement of the pelvis in the coronal (frontal) plane during activities such as walking. It describes the difference between the maximum upward tilt (hip hike) and maximum downward tilt (hip drop) of one side of the pelvis relative to the opposite side. Measured in degrees (°) to quantify the range of motion.

Pelvic rotation range

时间窗: 3 months

Refers to the total angular movement of the pelvis in the transverse (horizontal) plane during activities such as walking. It represents the difference between the maximum forward rotation and maximum backward rotation of the pelvis around a vertical axis within a given cycle. Measured in degrees (°) to quantify the range of rotational motion.

Pelvic symmetry tilt index

时间窗: 3 months

Is a quantitative measure that evaluates the symmetry of pelvic tilt during movement. It assesses the degree of deviation in pelvic tilt between the left and right sides in the sagittal plane, providing insight into potential imbalances or asymmetries. Expressed as a percentage (%) to indicate the level of symmetry.

Pelvic symmetry obliquity index

时间窗: 3 months

Is a quantitative measure used to evaluate the symmetry of pelvic obliquity during movement. It quantifies the degree of deviation in upward or downward tilt of the pelvis on one side compared to the other in the coronal (frontal) plane, helping to identify potential imbalances or asymmetries. Expressed as a percentage (%) to represent the level of symmetry.

Pelvic symmetry rotation index

时间窗: 3 months

Is a quantitative measure used to assess the symmetry of pelvic rotation during movement, particularly in the transverse (horizontal) plane. It calculates the difference in rotational movement between the left and right sides of the pelvis, helping to identify any imbalances or asymmetries in pelvic motion during activities like walking.Expressed as a percentage (%) to indicate the level of symmetry.