U. Ilyas, Wajida Perveen, M. Akhtar, R. Hashmi, I. Amin, and Z. Mehmood Bhatti, “Extensor lag in patients after total knee arthroplasty with and without pre-operative rehabilitation regime: a short report”, J Pak Med Assoc, vol. 72, no. 8, pp. 1639–1641, Apr. 2022.