OPC Orthotics Written Practice Questions - OPC Orthotics Written Certification Examination Exam

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A 6-year-old patient with an L4 level myelomeningocele presents for a gait assessment. During the physical exam, you note a 15-degree knee extension lag, 5 degrees of ankle dorsiflexion, and 3/5 strength in the tibialis anterior. During observational gait analysis, you observe excessive knee flexion during mid-stance. What is the primary biomechanical cause of this gait deviation?

Triceps surae spasticity causing premature heel rise and secondary knee flexion Weakness of the quadriceps failing to prevent knee flexion coupled with insufficient plantarflexion-knee extension coupling Ankle dorsiflexion contracture shifts the ground reaction force vector anterior to the knee joint center Hip flexor spasticity leading to anterior pelvic tilt and compensatory hip and knee flexion

Correct Answer:

Weakness of the quadriceps failing to prevent knee flexion coupled with insufficient plantarflexion-knee extension coupling

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