Patellar tendinopathy usually produces focal load-related pain at the patellar tendon, most commonly near the inferior pole of the patella. Patellofemoral pain is generally less focal and is felt around or behind the patella during activities such as squatting, stairs, running or prolonged sitting. Because both conditions can hurt during loaded knee flexion, the distinction comes from pain location, loading behavior, palpation, functional testing and the rest of the knee examination.
Where does patellar tendinopathy hurt?
Patellar tendinopathy is primarily a clinical diagnosis characterized by localized patellar-tendon pain that increases as knee-extensor demand increases. A 2015 clinical review described two hallmark features: pain localized to the inferior pole of the patella, the bottom point of the kneecap, and load-related pain that increases with demand on the knee extensors, especially activities that store and release energy in the tendon.
People often point to a small spot just below the kneecap. Pain is commonly worse at the start of activity, may settle as they warm up, and then returns later or the next morning after a heavy session. It tends to scale with load: walking may be comfortable, while jumping, landing and decelerating are not.
Where does patellofemoral pain hurt?
Patellofemoral pain comes from the joint between the kneecap and the thigh bone and the tissues around it. It is usually felt around or behind the kneecap rather than at one point, and people often describe it with a hand over the front of the knee rather than a fingertip. Common aggravators are squatting, stairs, running, kneeling and sitting for long periods with the knee bent.
Patellofemoral pain is also primarily a clinical pattern rather than a single-test diagnosis. Pain distribution, aggravating activities and the overall examination are more useful than relying on one provocative test. Systematic reviews of clinical tests for patellofemoral pain have found that most diagnostic-accuracy studies had notable design or reporting biases and that no single test was strong enough to diagnose it on its own.
| Patellar tendinopathy | Patellofemoral pain | |
|---|---|---|
| Where it hurts | Focal, at or near the inferior pole of the kneecap | Around or behind the kneecap, more diffuse |
| Most provocative | Jumping, landing, acceleration, deceleration, deep loaded knee bending | Squatting, stairs, running, kneeling, prolonged sitting |
| Behavior with activity | Often worse at the start, may ease, then worse later or next day | Often builds with sustained or repeated knee bending |
| Palpation | Tendon tenderness may reproduce familiar pain | Tenderness less specific; may be around the kneecap edges |
| Response to graded load | Pain tends to rise with the magnitude and rate of tendon loading | Pain tends to rise with depth and duration of knee flexion |
These are tendencies, not rules.
Why jumping and tendon loading matter
The patellar tendon behaves partly like a spring. Jumping, landing and cutting store and release energy in the tendon quickly, which is why those tasks are often the most provocative in tendinopathy. A laboratory study of 35 rehabilitation exercises in 20 healthy adults ranked them by patellar tendon load. The single-leg decline squat had the highest loading index, and the single-leg forward hop, single-leg countermovement jump and running cut were also in the highest tier, while step-ups, step-downs and double-leg partial squats were in the lowest.
Pain that climbs as tasks move up that ladder, and settles as they move down it, points toward the tendon.
Why squatting can hurt in both conditions
Squatting loads the patellar tendon and compresses the patellofemoral joint at the same time. Pain with a squat therefore does not settle the diagnosis, and pain with stairs does not automatically mean patellofemoral pain. One meta-analysis found that a squatting test showed only a trend toward diagnostic usefulness for patellofemoral pain and did not reach the accuracy needed to rely on it.
Provocation is most useful when combined with exact symptom location and the pattern of increasing mechanical demand. A person whose pain stays below the kneecap and sharpens on a single-leg decline squat or hop looks different from a person whose pain spreads around the kneecap with deep, sustained bending.
What palpation can and cannot tell you
Pressing on the patellar tendon can reproduce familiar pain in tendinopathy, and it helps confirm where symptoms come from. But tendons can be tender in people without tendinopathy, and nearby structures such as the infrapatellar fat pad lie close to the tendon. Palpation supports the diagnosis when it matches the history and the loading response. It does not establish the diagnosis alone.
How loading response helps localize the problem
The examination usually moves through a graded sequence: double-leg then single-leg squats, a decline squat where tolerated, then hops or jumps if appropriate. Watching where the pain appears and how it scales with load is often more informative than any single test. The same response also shows the tendon's current capacity, which guides where rehabilitation should start.
When ultrasound or MRI is useful
Imaging is not usually needed to make the initial diagnosis. Ultrasound or MRI becomes more useful when the diagnosis is uncertain, symptoms are atypical, a partial tear is suspected, there is substantial swelling or mechanical symptoms, or the knee is not progressing as expected.
Why imaging alone cannot establish the diagnosis
Structural changes in the patellar tendon are common in people without pain. In a study of elite Australian athletes, 14% of patellar tendons in athletes who had never had anterior knee pain showed hypoechoic regions on ultrasound. A prospective study of elite junior basketball players found that tendons with these changes were about four times more likely to become symptomatic, yet some changes resolved, and players did not need the image to normalize to become pain-free.
A 2025 meta-analysis of 16 studies, including 1,156 patellar tendons, found that an abnormal ultrasound raised the risk of later patellar tendon pain about sixfold (risk ratio 6.07), but its positive predictive value was only 27.2%. Most abnormal-looking tendons did not become painful. Ultrasound abnormalities increase the likelihood of future symptoms, but abnormal structure is not equivalent to current pain. Imaging must be interpreted alongside the history and examination.
The reverse also matters: a person with patellofemoral pain can have an abnormal-looking tendon that is not the source of their symptoms.
Can both conditions exist together?
Yes. A knee can have both patellar tendon pain and patellofemoral pain, and pain in one can change how the other is loaded. When the findings point both ways, both are considered and the rehabilitation plan accounts for each.
When knee osteoarthritis, meniscus or fat-pad problems should be considered
- Infrapatellar fat pad irritation: pain beside the tendon, often provoked by full extension or direct compression.
- Quadriceps tendon pain: pain above the kneecap rather than below it.
- Meniscal or other intra-articular problems: joint-line pain, swelling, catching, locking or giving way.
- Knee osteoarthritis: more likely with older age, morning stiffness, swelling and joint-line pain. See knee pain and osteoarthritis.
- Patellar tendon tear: a sudden pop, inability to straighten the knee or a palpable gap needs urgent imaging and orthopedic assessment.
How the distinction changes treatment
Patellar tendinopathy is managed by progressively rebuilding tendon capacity, moving from lower-load tasks toward jumping and sport-specific loading. In selected persistent cases, shockwave may be added; the evidence is reviewed in shockwave therapy for patellar tendinopathy. Patellofemoral pain is usually managed with hip and knee strengthening, load and activity modification, and education, with a different emphasis on which tasks to progress.
How Novo evaluates anterior knee pain
We localize the pain, test how it responds to graded loading, examine the tendon, fat pad, kneecap and joint line, check hip and quadriceps strength, and review previous imaging and treatment. The aim is to identify the structure producing the pain before choosing a treatment. See how we approach patellar tendinopathy, or book a new patient exam.
References
- Malliaras P, Cook J, Purdam C, Rio E. Patellar tendinopathy: clinical diagnosis, load management, and advice for challenging case presentations. Journal of Orthopaedic & Sports Physical Therapy. 2015;45(11):887-898. PMID 26390269. (link)
- Cook JL, Khan KM, Harcourt PR, et al. Patellar tendon ultrasonography in asymptomatic active athletes reveals hypoechoic regions: a study of 320 tendons. Clinical Journal of Sport Medicine. 1998;8(2):73-77. PMID 9641432. (link)
- Cook JL, Khan KM, Kiss ZS, Purdam CR, Griffiths L. Prospective imaging study of asymptomatic patellar tendinopathy in elite junior basketball players. Journal of Ultrasound in Medicine. 2000;19(7):473-479. PMID 10898301. (link)
- Cushman DM, Vomer R, Teramoto M, et al. Sonographic assessment of asymptomatic patellar and Achilles tendons to predict future pain: a systematic review and meta-analysis. Clinical Journal of Sport Medicine. 2025;35(1):13-22. PMID 38864880. (link)
- Cook C, Mabry L, Reiman MP, Hegedus EJ. Best tests/clinical findings for screening and diagnosis of patellofemoral pain syndrome: a systematic review. Physiotherapy. 2012;98(2):93-100. PMID 22507358. (link)
- Nunes GS, Stapait EL, Kirsten MH, de Noronha M, Santos GM. Clinical test for diagnosis of patellofemoral pain syndrome: systematic review with meta-analysis. Physical Therapy in Sport. 2013;14(1):54-59. PMID 23232069. (link)
- Scattone Silva R, Song KE, Hullfish TJ, et al. Patellar tendon load progression during rehabilitation exercises: implications for the treatment of patellar tendon injuries. Medicine & Science in Sports & Exercise. 2024;56(3):545-552. PMID 37847102. (link)
