There are many ways to make an opponent submit in Brazilian jiu jitsu (BJJ). Joint lock is a technique that manipulates the joint of an opponent in a manner that it reaches their minimal degree of motion. There are various types of locks in Baltimore BJJ, including spinal locks, leg locks, arm locks, wristlocks and small joint manipulation. However, some people these locks ineffective if you do it the wrong way.
Poor procedure is very common in doing joint locks. In order to execute a joint lock properly, you have to learn the procedure of joint locks. You should know where to put your strength, and your body weight will be into the joint.
Moreover, a joint lock will be unsuccessful if you have a very flexible opponent. There are some people who can bend their arms backward to a 90 degrees angle. There are also some people that can bend their wrist backward and touch their forearms using their palms.
Also, there are people who have a high tolerance for pain. This can be one possible reason why a joint lock fails. This means that the person will be able to withstand the joint lock even if you are able to execute it correctly. Tolerance for pain can also be because of mental problem or high on drugs. You have to try another submission technique when this is the case. You can use chokehold because it will leave them unconscious if they do not submit.
It is very rare to encounter a person that is flexible. Thus, another reason why the joint lock is not working could be because of a previous injury on the same spot.
Finally, the last reason why the joint lock that you apply to an opponent is not effective could be a combination of any reasons discussed. For example, you have a very flexible opponent that you have a hard time controlling. Thus, poor mechanics happen to the joint lock that you try to execute. The correct execution of a joint lock really depends on your ability to execute it, as well as the degree of competency of your opponent.
Baltimore BJJ is not the only martial art style that uses joint locks in order to make the opponent submit. Judo, Aikido, and Catch Wrestling are some of the martial arts that use joint locks too. In order to get joint locks right, you have to practice the technique regularly.