Diagnostic anaesthesia of the femoral nerve may help to identify quadriceps muscle involvement in spastic paresis of the hind limbs but, especially in mixed types of spasticity, clinical examination often remains inconclusive.
Some animals show clinically obvious quadriceps or gastrocnemius spasticity while other muscles are also involved but are overlooked. Their involvement will appear after successful perineural injection which then allows objective evaluation of what further treatment is possible.