Scissor gait is a form of gait abnormality primarily associated with spastic cerebral palsy. That condition and others like it are associated with an upper motor neuron lesion.
Scissor gait Wikipedia
This gait pattern is reminiscent of a marionette. Hypertonia in the legs, hips and pelvis means these areas become flexed to various degrees, giving the appearance of crouching, while tight adductors produce extreme adduction, presented by knees and thighs hitting, or sometimes even crossing, in a scissors-like movement while the opposing muscles, the abductors, become comparatively weak from lack of use. Most common in patients with spastic cerebral palsy, the individual is often also forced to walk on tiptoe unless the plantarflexor muscles are released by an orthaepedic surgical procedure.
These features are most typical with the scissors gait and usually result in some form and to some degree regardless of the mildness or severity of the spastic CP condition:rigidity and excessive adduction of the leg in swing
plantar flexion of the ankle
flexion at the knee
adduction and internal rotation at the hip
progressive contractures of all spastic muscles
complicated assisting movements of the upper limbs when walking.
Cervical spondylosis with myelopathy (a problem with the vertebrae in the neck)
Spinal cord trauma
Spinal cord tumor
other forms of Cerebral palsy