what causes buckling
Also called a loose body or joint mouse, this can become caught in your joint, causing your knee to buckle and even catch.. The buckling you describe may be caused by instability of the knee due to weakened ligaments. Loose bodies can form because of trauma, because of a broken-off osteophyte (bony spur), or because of osteochondritis dissecans, where part of the bone loses circulation and fragments.