Jamal Adams' Torn Quad Tendon — And Why This Is the Injury That Keeps Finding Him

Vikings safety Jamal Adams is out for the 2026 season with a torn right quadriceps tendon, suffered on a non-contact play in Minnesota's preseason opener. This isn't his first time — he tore a quad tendon once before, back in 2022.

The anatomy: The quadriceps tendon connects the big thigh muscles (the quadriceps group) to the top of the kneecap. It's a different structure from the ACL or MCL — those are ligaments connecting bone to bone inside the joint; the quad tendon is what lets the thigh muscle actually straighten the knee. When it tears, the connection between "muscle contracts" and "leg extends" is broken.

Why it happened without contact: Quad tendon tears usually occur during eccentric loading — when the muscle is under tension while lengthening, like decelerating or absorbing bodyweight on a bent knee. A defensive back planting and redirecting to change coverage angles is a textbook setup: the tendon has to handle a sudden, forceful load exactly at the moment it's stretched. Age matters too — the tendon's blood supply and elasticity decline over time, which is part of why these tears show up more in players in their late 20s and 30s than in rookies.

Why this is the injury to watch, not just this one: A second quad tendon tear — even on the opposite leg — raises a real question that a single injury doesn't: is there something about how this player loads his knees, or how much wear his tendons have already absorbed over a 10-year career, that makes this more likely to happen again? Surgeons will repair the tendon (usually with sutures anchoring it back to the kneecap), but recovery is typically 9-12 months, and quad tendon repairs have historically shown more variability in players fully regaining their pre-injury explosiveness than ACL repairs do.