What are lax ligaments?

Synonymous w/ loose. Lax is short for laxity. Lax ligaments are describing ligaments that are loose and have increased laxity. There is a spectrum of laxity that is normal within all joints. Some people are looser or tighter than others. If one has no symptoms or limitations, no treatment or remedy is warranted. If pain or instability is present, the increased laxity is said to be abnormal (pathologic or patholaxity).
Loose jointed. Ligaments may be lax or loose due to genetic predisposition or acquired due to injury.