The main objective of the study is to evaluate spatiotemporal parameters of gait in tumoral patients with megaprosthesis of the distal femur.
Patients with distal femoral prostheses treated at La Fe Hospital in Valencia were evaluated and compared with healthy controls. A radiographic study was conducted in cases using telemetric imaging to assess the percentage of remaining bone and the long length limb discrepancy following surgical intervention. Additionally, a gait analysis was performed using the BTS device to obtain objective gait parameters. The gait assessment was conducted with a non-invasive portable device, the BTS G-sensor inertial sensor (BTS Bioengineering, Garbagnate Milanese, Italy), which was placed at the S1 level to collect spatio-temporal gait data. The data were analyzed in relation to the values in healthy patients.
Study Type
OBSERVATIONAL
Enrollment
79
Gait assessment will be performed using a non-invasive device. It is the BTS G-sensor inertial sensor (BTS Bioengineering, Garbagnate Milanese, Italy). The spatiotemporal variables of gait will be studied from the Walk+ protocol, in which the participant navigates a 7-meter hallway six times, completing three round trips with necessary turns at each end to change direction.
Universidad Ceu Cardenal Herrera
Valencia, Spain
Antero-posterior acceleration symmetry index
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.
Time frame: 3 months
Stance Phase
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.
Time frame: 3 months
Swing Phase
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.
Time frame: 3 months
Gait Quality Index
The stance-swing phase ratio
Time frame: 3 months
First Double support phase
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.
Time frame: 3 months
Single Support Phase
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.
This platform is for informational purposes only and does not constitute medical advice. Always consult a qualified healthcare professional.
Time frame: 3 months
Propulsion Index
This measures the subject's ability to propel the centre of mass forward during the single support stance phase.
Time frame: 3 months
Pelvic tilt range
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.
Time frame: 3 months
Pelvic obliquity range
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.
Time frame: 3 months
Pelvic rotation range
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.
Time frame: 3 months
Pelvic symmetry tilt index
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.
Time frame: 3 months
Pelvic symmetry obliquity index
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.
Time frame: 3 months
Pelvic symmetry rotation index
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.
Time frame: 3 months
Bone remmant (%)
Bone remment respect a healthy femur in percentage (%)
Time frame: 3 months
Long discrepancy (mm)
Long discrepancy in milimeters (mm) between healthy and tumoral leg. Positive discrepancy (tumoral leg longer) or negative discrepancy (tumoral leg shorter).
Time frame: 3 months