Final answer:
The factor that does NOT contribute to joint stability is the amount of synovial fluid in the joint cavity.
Step-by-step explanation:
The factor that does NOT contribute to joint stability is the amount of synovial fluid in the joint cavity.
Synovial joints are strengthened by factors such as
the amount of muscle tone applied to tendons that cross the joint,
the number and positioning of reinforcing ligaments,
and
the shape of the articulating surfaces.
These factors help support the joint, hold the bones together, and resist excessive or abnormal movements. However, the amount of synovial fluid in the joint cavity is not directly involved in providing stability to the joint.