Patellar Tendonitis vs Patellofemoral Pain Syndrome: Below vs Behind the Kneecap

Yes — and they can coexist, especially in athletes who do both jumping and running sports. Co-occurrence is common because: 1) Both are overuse injuries from cumulative training stress, 2) Hip weakness underlies both conditions, 3) Years of repetitive activity stresses multiple knee structures simultaneously. When both are present, treatment addresses both — eccentric decline squats for patellar tendonitis, hip strengthening for PFPS, and addressing each condition's specific contributors. The good news is that hip strengthening helps both conditions, and load management benefits both.

Different activities load different structures. Jumping creates intense eccentric loading on the patellar tendon during landing — explaining the pain BELOW the kneecap. Running involves repetitive knee flexion-extension under load that affects the patellofemoral joint — explaining the pain BEHIND the kneecap. Activity-specific symptoms are useful diagnostic clues. If you're a multi-sport athlete with both pain patterns, you may have both conditions and need a comprehensive treatment plan addressing each.

The decline squat (25-30° decline board) on a single leg is uniquely effective because: 1) Isolates the patellar tendon — the decline angle increases tendon strain by ~25%, focusing healing where needed, 2) Eccentric loading stimulates collagen remodeling and tendon adaptation, 3) Pain during exercise is therapeutic — controlled microtrauma triggers healing (up to 4/10 pain is acceptable). Studies show 60-90% success rates with 12-week protocols (3 sets of 15 reps, twice daily). Flat surface squats are less effective for tendon healing — the decline angle is critical. This is the Curwin-Stanish protocol for patellar tendinopathy.