The Achilles and patellar tendons are particularly susceptible to chronic injuries from activities such as running and jumping because of their crucial roles in the mechanics of these movements. The Achilles tendon connects the calf muscles to the heel bone and is heavily involved in activities that require propulsion and jumping. It undergoes significant stress with repetitive weight-bearing activities, making it prone to conditions like Achilles tendinopathy.
Similarly, the patellar tendon, which connects the kneecap (patella) to the shinbone (tibia), is subjected to considerable stress during running and jumping when the quadriceps muscles exert force to extend the knee. This frequent stretching and loading can lead to irritation and eventual degeneration of the tendon, often resulting in patellar tendinopathy, commonly referred to as "jumper's knee."
Given the mechanics of running and jumping, the chronic microtrauma associated with these high-impact activities makes both the Achilles and patellar tendons more vulnerable to injuries over time compared to the other options listed. The other tendon groups do not primarily engage in the repetitive high-stress movements associated specifically with running and jumping, making them less susceptible to the same type of chronic injuries.