Knee thrusts to the outer side with each step.
Joint line gap closed on medial side following medial meniscectomy.
Implications of varus thrust
A varus thrust is the result of a meniscectomy on the medial side, closing the X-ray gap that normally exists because of the radiolucent meniscus that normally fills the gap. Eventually the ligaments can stretch and bow-leggedness becomes permanent rather than only occuring on weight-bearing.
Frequency of Varus and Valgus Thrust and Factors Associated with Thrust Presence in Persons With or at Higher Risk for Knee Osteoarthritis Chang A et al. Arthritis Rheum. 2010 May; 62(5): 1403–1411.
Varus thrust during walking and the risk of incident and worsening medial tibiofemoral MRI lesions: the Multicenter Osteoarthritis Study. Wink AE, Gross KD, Brown CA, Guermazi A, Roemer F, Niu J, Torner J, Lewis CE, Nevitt MC, Tolstykh I, Sharma L and Felson DT. Osteoarthritis Cartilage. 2017 Jun; 25(6): 839–845.