Final answer:
The strength of a synovial joint is largely influenced by the ligaments that reinforce it, along with the presence of an articular disc and the supportive role of muscles and tendons.
Step-by-step explanation:
Factors that contribute to the strength of a synovial joint include the robustness and arrangement of ligaments that surround and reinforce the joint. These ligaments hold the bones together and prevent excessive or abnormal joint motions. Moreover, the presence of an articular disc, such as a meniscus, can enhance the stability and strength of a synovial joint by providing additional cushioning, smoothing bone movements, or binding the bones more firmly. It's also important to acknowledge that muscles and their tendons contribute to joint strength by providing contractile force that indirectly supports the joint during movement.