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(A): Knee hyperextension due to a combination of ankle plantar flexor spasticity and knee extensor spasticity. worsening of knee hyperextension is observed after a lidocaine block to the tibial nerve. (B): Difficult knee flexion due to quadriceps muscle spasticity. Improvement in knee flexion during the swing phase is observed after a lidocaine block to femoral nerve motor branches to quadriceps muscles.
