What is the primary side effect associated with "open scissors syndrome"?

The primary side effect associated with "open scissors syndrome" is decreased intra-abdominal pressure. This syndrome typically arises from altered mechanics and muscle imbalances, often leading to an increased distance between the two sides of the pelvis. As a result, the core stabilizing muscles may not engage effectively, leading to a reduction in the pressure within the abdominal cavity. This decreased pressure can compromise core stability and increase the risk of injury during movement, as the body relies on proper intra-abdominal pressure for stability and support during activities.

Considering other options, while decreased joint mobility, increased intra-abdominal pressure, and poor posture may occur due to various musculoskeletal conditions or improper biomechanics, they are not the primary side effects directly linked to open scissors syndrome. The syndrome's distinct mechanics emphasize the importance of proper intra-abdominal pressure for stability and movement efficiency, which is why decreased intra-abdominal pressure is the most relevant consequence in this context.