Patellar Tendon Pain, Explained
Why your knee hurts just below the kneecap, and why rest alone rarely fixes it
A 4-minute guide to patellar tendon pain: what is going on, what the research says works, and where a strap actually fits in.
The pain has a precise address.
Patellar tendinopathy, often called jumper's knee or patellar tendonitis, usually hurts in one spot: where the patellar tendon meets the bottom of your kneecap.
That tendon carries the force every time you land, climb a stair, squat or push off. When the load climbs faster than the tendon can adapt, that spot gets sore, and it often gets worse after sitting, on stairs and at the start of a run.
Nearly half of elite volleyball players had it.
A study of 613 elite Norwegian athletes found current jumper's knee in 14% overall, and far more in jumping sports. Those who had it had lived with it for an average of 32 months.
Lian, Engebretsen and Bahr. Am J Sports Med, 2005. Current jumper's knee among national-level athletes.
months: the average time athletes in that study had been living with their symptoms. Waiting it out rarely works fast.
Signs it may be your patellar tendon
- The pain sits just below the kneecap, in a spot you can point to with one finger.
- Stairs, squats, lunges or landing from a jump bring it on.
- It eases once you are warmed up, then comes back after you stop or the next morning.
- Sitting for a long time with your knee bent makes it ache.
This is general education, not a diagnosis. If your knee is swollen, locks, gives way, or the pain followed a fall or a twist, see a doctor or physical therapist first.
Rest calms it. Loading is what changes it.
Tendons respond to load. The programs with the best evidence for patellar tendinopathy all use slow, heavy, progressive exercise, while supports help you keep moving comfortably along the way.
Heavy holds can switch pain down, fast
In a randomized cross-over study of 6 volleyball players with patellar tendinopathy, pain during a single-leg decline squat (0 to 10):
Isometric holds vs. isotonic reps. Relief after holds lasted at least 45 minutes. Rio et al., Br J Sports Med, 2015.
Decline squats
Squatting on a 25 degree decline board reduced pain in athletes with chronic patellar tendinopathy in a pilot study, more than the same squats on flat ground.
Purdam et al., Br J Sports Med, 2004.
Months later, still better
In a trial of 39 men, decline squat training and heavy slow resistance both improved symptoms and held at six months. Steroid injections helped at first, then faded.
Kongsgaard et al., Scand J Med Sci Sports, 2009.
Straps help you keep moving
In 16 young basketball and volleyball players, an infrapatellar strap reduced pain in three of four jump tests, with no loss of jump height.
Dar and Mei-Dan, Prosthet Orthot Int, 2019.
Pressure on one spot, not the whole knee.
A knee sleeve squeezes everything. A patellar tendon strap presses on one place: the tendon just below your kneecap. Imaging research found that infrapatellar straps lowered the strain predicted at the usual pain spot during a modeled jump landing.
- Contoured 3D silicone pad that sits on the tendon, not on the bone.
- U-shaped top edge that cradles the bottom of the kneecap, so the pad stays centered while you move. That is the slipping problem most cheap straps never solve.
- Two straps in every box, one for each knee or a spare for your bag.
Lavagnino et al., Sports Health, 2011 (20 adult men, computer model of strain).
Calm it. Load it. Protect it.
Most knee brands sell you one product and wish you luck. We built the whole routine around how tendons actually recover, and every order comes with The Knee Reset, a free 14-day plan that puts it together.
1. Calm
Cold after training to settle a sore, irritated tendon.
2. Load
Slow holds and decline squats, the exercises with the strongest research.
3. Protect
A strap on the tendon for stairs, runs, lifts and game days.
What you actually get for your money
| Patellar Tendon Strap Co. | Typical $10 strap | Knee sleeve | Rest and wait | |
|---|---|---|---|---|
| Targets the patellar tendon | Yes | Yes | No | No |
| Contoured pad that cradles the kneecap | Yes | Usually a foam tube | No | No |
| 14-day loading plan included | Yes | No | No | No |
| Cold, load and protect in one kit | Yes | No | No | No |
| 90-day money-back guarantee on the strap | Yes | Varies | Varies | Free, but slow |
| A real person answers in 1 business day | Yes | Varies | Varies |
Comparison columns describe common options, not specific brands. Typical marketplace straps sell for about $8 to $14 for a 2-pack.
Everything the research points to, in one box.
Calm it after training, load it at home with The Knee Reset plan, protect it when you move.
Fall Sale: 10% off everything, applied automatically at checkout. Ends Nov 4 at midnight ET.
The Knee Relief Kit
2 patellar tendon straps, a compression knee sleeve and a hot and cold knee wrap, plus The Knee Reset plan.
Just the straps
One pair, two 3D silicone straps, plus The Knee Reset plan.
Want to load the tendon at home?
Add the decline squat wedges ($49.95) or the 5-band mini set ($24.95).
See the whole system- Free tracked US shipping. Delivery dates are shown on each product page before you buy.
- The Knee Reset 14-day plan included with every order.
- 90-day money-back guarantee on the straps. The kit and other items: free returns within 30 days, unused.
Try the strap for 90 days. Keep it either way.
If you are not happy with your Patellar Tendon Strap, email us within 90 days of delivery for a full refund of the product price. No return shipping. The kit and other items can be returned unused, in their original packaging, within 30 days. Expedited shipping and shipping protection are not refunded, and refunds are limited to one per customer. Full policy.
A small brand, out in the open.
Patellar Tendon Strap Co. is a small online brand run by House Lakan Limited in Hong Kong. Your order ships with tracking from our fulfilment partner's warehouse in Jinhua, China, and arrives in 6 to 10 business days. Questions go to a real person at hello@patellartendonstrap.com, answered within 1 business day.
We launched in October 2026, so there are no customer reviews yet, and we won't make any up. That is why every strap order comes with the 90-day money-back guarantee.
Before you decide
Will a strap fix my patellar tendinopathy?
No strap fixes a tendon on its own. It can make activity more comfortable by changing how load reaches the sore spot. Progressive exercise, like The Knee Reset plan, is what helps the tendon adapt. If pain is severe or lasts more than a few weeks, see a physical therapist.
Strap or kit: which should I get?
If you want something for sport and stairs, start with the straps. If you also want cold after training and a sleeve for warmth, the kit costs $19.90 less than buying the three separately.
How long until it arrives?
Orders are processed in 1 to 2 business days and delivered in 5 to 8 business days with free tracked shipping. Expedited shipping is available at checkout. Orders ship from our fulfilment partner's warehouse in Jinhua, China.
Is it right for Osgood-Schlatter or teens?
Our straps are sized for adults and may be loose on smaller legs. Check with your child's doctor or physical therapist first.
References
- Lian OB, Engebretsen L, Bahr R. Prevalence of jumper's knee among elite athletes from different sports: a cross-sectional study. Am J Sports Med. 2005;33(4):561-567. PubMed
- Rio E, Kidgell D, Purdam C, et al. Isometric exercise induces analgesia and reduces inhibition in patellar tendinopathy. Br J Sports Med. 2015;49(19):1277-1283. PubMed
- Purdam CR, Jonsson P, Alfredson H, et al. A pilot study of the eccentric decline squat in the management of painful chronic patellar tendinopathy. Br J Sports Med. 2004;38(4):395-397. BJSM
- Kongsgaard M, Kovanen V, Aagaard P, et al. Corticosteroid injections, eccentric decline squat training and heavy slow resistance training in patellar tendinopathy. Scand J Med Sci Sports. 2009;19(6):790-802. PubMed
- Lavagnino M, Arnoczky SP, Dodds J, Elvin N. Infrapatellar straps decrease patellar tendon strain at the site of the jumper's knee lesion: a computational analysis based on radiographic measurements. Sports Health. 2011;3(3):296-302. PMC
- Dar G, Mei-Dan E. Immediate effect of infrapatellar strap on pain and jump height in patellar tendinopathy among young athletes. Prosthet Orthot Int. 2019;43(1):21-27. DOI
The studies above looked at exercise programs and infrapatellar straps in general, not at our products specifically. Our products are supports and training tools. They are not intended to diagnose, treat, cure or prevent any disease or medical condition.