James R. Gage

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A method is derived to calculate the amount by which a subject's gait deviates from an average normal profile, and to represent this deviation as a single number. The method uses principal component analysis to derive a set of 16 independent variables from 16 selected gait variables. The sum of the square of these 16 independent variables is interpreted as(More)
Stance phase stability and swing phase clearance, prerequisites for normal ambulation, often are lost in the gait of children with cerebral palsy. Lengthening of the hamstrings usually will improve stance-phase knee extension but will not greatly alter swing-phase knee flexion. This paper presents the outcome of transfer of the distal end of the rectus(More)
Four homogeneous patterns of gait were defined in forty-six patients who had spastic hemiplegia secondary to cerebral palsy or other neurological disorders by analyzing kinematic data in the sagittal plane and electromyographic data. In Group I (twenty patients) the primary abnormality was a drop foot in the swing phase. The thirteen patients in Group II(More)
The prerequisites for normal gait are: (1) stability in the stance phase of gait, (2) clearance of the foot in the swing phase, (3) proper foot preposition in swing, and (4) an adequate step length. In the stance phase, the knee provides shock absorption and energy conservation; in the swing phase, it allows foot clearance. To accomplish these functions,(More)
We evaluated femoral anteversion preoperatively in fifty-nine patients (ninety-one hips), using a clinical method that we developed, Magilligan radiographs, and computed tomographic scans. These measurements were then compared with values for anteversion that were obtained intraoperatively. To determine femoral anteversion clinically, the patient was placed(More)
Gait analysis is becoming a more integral part of the decision-making process in treatment of children with neuromuscular problems. A normal reference, however, must be available for comparison when one makes decisions. We wished to develop a normal pediatric database for joint kinematics and kinetics which could then be used as a reference for clinical(More)
Rectus femoris muscle (RF) surgery was performed in 98 children (136 sides) with cerebral palsy (CP). RF transfer was performed in 105 lower limbs, and distal RF release was performed in 31. Eleven (20 sides) similarly affected children had no RF procedure and are included for comparison. Gait analysis was performed just before and approximately 1 year(More)
Rectus femoris transfer was performed in 78 children (105 sides) with cerebral palsy (CP) at the same time as other surgical procedures as appropriate. The transfer was either medial to the sartorius (62 sides), semitendinosus (19 sides), or the gracilis (14 sides) muscles, or laterally to the iliotibial band (10 sides). Gait analysis performed before and 1(More)
Stiff-knee gait is a movement abnormality in which knee flexion during swing phase is significantly diminished. This study investigates the relationships between knee flexion velocity at toe-off, joint moments during swing phase and double support, and improvements in stiff-knee gait following rectus femoris transfer surgery in subjects with cerebral palsy.(More)