▁flex ion ▁contract ure ) ▁ ▁Pop l ite us ▁mus cle ▁weak ness ▁ ▁Connect ive ▁t issue ▁dis orders . ▁In ▁these ▁dis orders , ▁there ▁are ▁excess ive ▁joint ▁mob ility ▁( joint ▁hyper m ob ility ) ▁problems . ▁These ▁dis orders ▁include : ▁ ▁Mar fan ▁synd rome ▁ ▁Lo e ys – D iet z ▁synd rome ▁ ▁E hl ers – Dan los ▁synd rome ▁ ▁Ben ign ▁hyper mobile ▁joint ▁synd rome ▁ ▁O ste ogen esis ▁imper fect a ▁disease ▁ ▁Path oph ys i ology ▁The ▁most ▁important ▁factors ▁of ▁kne e ▁stability ▁include : ▁ ▁Lig aments ▁of ▁the ▁kne e : ▁The ▁kne e ▁joint ▁is ▁stabil ized ▁by ▁four ▁main ▁lig aments : ▁ ▁An terior ▁cru ci ate ▁lig ament ▁( AC L ). ▁The ▁A CL ▁has ▁an ▁important ▁role ▁in ▁stabil ization ▁of ▁kne e ▁extension ▁movement ▁by ▁prevent ing ▁the ▁kne e ▁from ▁hyp ere xt ending . ▁ ▁Post er ior ▁cru ci ate ▁lig ament ▁( P CL ) ▁ ▁Med ial ▁coll ater al ▁lig ament ▁( M CL ) ▁ ▁Later al ▁coll ater al ▁lig ament ▁( L CL ) ▁ ▁J oint ▁caps ule ▁or ▁art icular ▁caps ule ▁( es pecially ▁posterior ▁kne e ▁caps ule ) ▁ ▁Qu adr ice ps ▁fem oris ▁mus cle ▁ ▁App ropri ate ▁alignment ▁of ▁the ▁fem ur ▁and ▁tib ia ▁( es pecially ▁in ▁kne e ▁extension ▁position ▁) ▁ ▁Tre