Knee leh hip joint system hian heng weight-bearing joint lian pahnih nena inzawm thestructure, function, biomechanics, leh medicalinterventions (implant leh surgicalprocedures ang chi) te a kawk a ni.Heng system te hi mobility leh stability atan a pawimawh hle a, orthopedic treatments ang chi, jointreplacement surgery due to tar, arthritit, ortrauma ang chi te hi a ni tlangpui.