In the previous article I talked about the dynamic joint stabilizers.  Part 2 is focusing on the static stabilizers or ligaments and joint capsules.  The static stabilizers are designed form a hard barrier limiting joint range of motion, much like a rope tethering a ship to the dock.  There is play in these ligaments but once the tensile threshold is exceeded they will fail and allow the joint to exceed normal anatomical limits.  Once this occurs the joint is no longer stable and more times than not surgery is required to reestablish a base of stability.  The Anterior Cruciate Ligament is a good example that happens quite often.  Once ruptured most athlete's season is over for surgery and subsequent rehab for 9-12 months depending on the nature of their competition or extent of injury.  The important part of surgery that many people overlook is the need for proper rehab both before and after surgery.  As discussed in part 1, the dynamic stabilizers are the real safeguards to joint control and in order to make a full recovery and prevent repeat injury the dynamic stabilizers are the ones to focus on.  In the case of a non-contact ACL injury there is an imbalance in the hamstrings and quadriceps that causes the ACL rupture.  So once the rupture occurs, surgery is performed and rehab begins if careful attention is not paid to correcting previous aberrant muscle activation, balancing the quadriceps and hamstrings properly, the same injury will occur later on.