Natyashastra
विकलाङ्गप्रयोगेण कुहकाभिनयं प्रति । एकः खञ्जगतौ नित्यं स्तब्धो वै चरणो भवेत् ॥ १३२॥
In the representation of physical deformities for the Comic Sentiment, one type of lame gait is when one foot always remains stiff.
english translation
vikalAGgaprayogeNa kuhakAbhinayaM prati । ekaH khaJjagatau nityaM stabdho vai caraNo bhavet ॥ 132॥
hk transliteration by Sanscript