The ache sits right below the kneecap—worse warming up, worse the day after box jumps or heavy squats, worse standing up after sitting through a movie. Most athletes call it “jumper’s knee” and try to train through it, ice it, or stretch it out. The clinical name is patellar tendinopathy, and for volleyball and basketball players, CrossFit athletes, sprinters and jumpers, and lifters who squat and jump under load, it is one of the most common—and most commonly mismanaged—sources of chronic knee pain. At Performance Sport Care, our Walnut Creek sports chiropractic and rehabilitation clinic, patellar tendinopathy is a familiar problem because it often responds well to a properly staged loading program once the diagnosis fits the history and examination.
Short answer: focal pain at the lower edge of the kneecap that is aggravated by jumping, squatting, or repeated loading can fit patellar tendinopathy, especially when a decline squat reproduces the familiar pain. It still needs to be distinguished from other causes of anterior knee pain.
What Is Patellar Tendinopathy (“Jumper’s Knee”)?
Patellar tendinopathy is pain at the bottom tip of the kneecap that builds up gradually from repetitive loading—most often in athletes who jump, land, and change direction a lot. The older term “tendinitis” implies the tendon is simply inflamed and just needs to calm down before it heals. That’s not quite what’s happening here. The tendon is overworked and hasn’t been able to keep up with the demand placed on it, so it starts to break down faster than it can repair itself. Think of it less like “inflammation” and more like a tendon that’s been asked to do more than it’s currently capable of handling, over and over, without enough recovery in between to properly repair itself.
Most cases show up right at the bottom tip of the kneecap, where the tendon attaches to bone. Less often, the problem sits in the middle of the tendon itself, or lower down where the tendon attaches to the shin bone (more common in teenagers, who have a related but different growth-plate condition called Osgood-Schlatter disease).
Where It Comes From: Compressive and Tensile Overload at the Kneecap
Patellar tendinopathy develops from repeated overload right at the bottom tip of the kneecap—a combination of the tendon being stretched and squeezed at the same time. The biggest stress happens the instant you’re landing from a jump, when your quads have to work hard to slow your downward acceleration and control your landing. As your knee bends, the tendon wraps around the bottom tip of the kneecap like a rope around a pulley, pressing against the bone. The deeper you bend your knee on landing, the harder that compression becomes.
The part of the tendon that takes the brunt of this—the deep fibers right against the bone—also happens to have the poorest blood supply of any part of the tendon. That’s a big part of why the problem shows up there specifically, and why it can be slow to heal on its own. Over time, if the overload continues, the tendon goes through a few recognizable stages: first it gets irritated and a little swollen (this stage is fully reversible if you back off the load); then it starts trying to repair itself but does so in a disorganized way, growing extra small blood vessels into the area as part of that repair attempt; and if it’s pushed further without recovery, those changes become more established and harder to reverse. That new blood vessel growth also brings new nerve endings along with it—which is a big reason the pain can often persist even when the active “inflammation” is gone.
Who Gets Jumper’s Knee: Sports, Training Loads, and Risk Factors
Patellar tendinopathy is extremely common in jumping sports. Reported prevalence runs from 14–40% of elite jumping athletes, with figures as high as 45% in elite volleyball players at any given time. It affects men roughly twice as often as women, tends to peak between ages 20–40 in athletes doing high-volume jump training, and is bilateral in roughly a fifth to a third of cases. Beyond volleyball and basketball, we see it regularly in track and field jumpers, soccer and Australian rules football players, tennis players, and—increasingly—CrossFit and Olympic weightlifting athletes who combine high-volume box jumps with heavy, repeated squatting.
Training-load changes are one of the most useful things to ask about—a sudden jump in practice sessions, a new plyometric block, or a rapid return to full training after time off. Reduced ankle dorsiflexion, strength, prior tendon symptoms, recovery, and other athlete-specific factors may also matter. No single risk factor should be assumed to explain the problem in every athlete.
Common Patellar Tendinopathy Scenarios We See
The competitive basketball player
A player in his mid-twenties notices three months of gradually worsening pain below the kneecap—at first only during warm-up, now lasting through entire games. Practice volume recently jumped from three sessions a week to six ahead of the playoffs. Layups and box jumps now sit at a 7 out of 10. This is the classic training-load-spike presentation.
The CrossFit athlete
A CrossFit athlete training five days a week develops anterior knee pain about six weeks after her programming adds high-volume box jumps stacked with barbell back-squat cycling. She describes it as pain at “the bump at the bottom of the kneecap,” worse standing up from a chair. This is a pattern we see often in CrossFit and general strength training—box jumps and heavy squat volume loaded onto the same training block, with no deload built in.
The returning volleyball player
A club volleyball player comes back from a four-month off-season and jumps straight into full training. Within two weeks she has bilateral inferior kneecap pain, worse on the left. She had the same problem on the right side two years earlier and it resolved with physical therapy at the time. Returning to full jump volume without a graded build-up is one of the most reliable ways to reignite this problem, especially with a prior history on the other side.
How We Diagnose Patellar Tendinopathy
Diagnosis starts with a careful history and examination. The telltale sign is pinpoint tenderness right at the bottom tip of the kneecap when your knee is straight and your quad relaxed. There may be little warmth or puffiness around the knee, which is one of the details that helps us distinguish this from other kinds of kneecap pain. Many patients also notice stiffness after sitting for long periods. Pain and tightness upon standing is often called the “movie theater sign.”
One useful test is the single-leg decline squat: a slow, controlled single-leg squat performed on a decline. It can help reproduce and monitor patellar tendon symptoms in the context of the rest of the examination. Variations of decline-squat loading can also be useful later in rehabilitation when appropriate.
Imaging is not usually necessary to initially confirm a diagnosis when a careful history and examination has been conducted. However, when there are concerns about a possible tear or when a well-run conservative program has not helped, an MRI scan may provide a more definitive diagnosis or rule out other causes. A plain X-ray doesn’t show the tendon itself well, but X-rays may be appropriate for younger patients in situations where the integrity of the tendon’s attachment to bone or a growth-plate issue is in question.
A handful of other conditions can feel similar to jumper’s knee and we plan to discuss these separately in a follow-up article. Less commonly, knee pain may be referred from the hip or low back. This is where clinical experience and a willingness to widen the investigation matter. Dr. Cancel has practiced in California since 1983, knows the local medical community, and refers promptly when imaging, orthopedic consultation, or another type of care would be more useful than simply continuing treatment here.
Imaging findings don’t always match symptoms
Up to 22% of athletes with zero knee pain show tendon changes on ultrasound, which is why Dr. Cancel prefers MRI imaging when appropriate. We don’t over-diagnose or alarm people based on imaging alone, and tendon changes that show up on a scan don’t predict a poor outcome—even in longer-standing cases. We treat the clinical picture—the pain, the function, how you’re trending—and use imaging to add context to that picture, not replace it.
Why Rest Alone Doesn’t Fix Jumper’s Knee
Tendons adapt to load, and prolonged complete rest does not rebuild the capacity required for jumping, landing, running, or squatting. Rest may reduce symptoms temporarily, but rehabilitation eventually has to reintroduce load in a way the tendon can tolerate and build upon.
The rest of the athlete also matters. Hip and knee strength, ankle motion, landing strategy, training volume, and the demands of the sport can influence how the tendon is loaded. The relevant factors differ from person to person, which is why the loading plan should be staged rather than copied from a generic protocol.
How Performance Sport Care Treats Patellar Tendinopathy
Care starts by making sure the presentation fits patellar tendinopathy and deciding whether imaging or referral is needed. From there, treatment is matched to the stage of the problem and the athlete’s goal.
Dr. Douglas Cancel is a former National-level competitive bodybuilder and lifelong strength athlete who has practiced in California since 1983. That background helps when the endpoint is not merely comfortable walking, but a return to squatting, jumping, running, or demanding training. Our approach follows a simple sequence: relieve the pain, restore the movement, and rebuild strength.
Detailed functional assessment
We begin with a thorough history and exam, including the single-leg decline squat test, to confirm patellar tendinopathy and rule out other conditions that can feel similar. Ultrasound or MRI is ordered when it will meaningfully change the plan—not as a routine formality.
Chiropractic and manual therapy for the kinetic chain
Hip and lumbopelvic mobility deficits, altered motor patterns, and restricted ankle dorsiflexion are common contributors to tendon overload. Joint mobilization and manipulation address these restrictions, while soft-tissue work and instrument-assisted techniques applied to the quadriceps complex and lateral hip/thigh/knee help reduce excess tension contributing to abnormal tendon loading.
Supervised strength rehabilitation
Performance Sport Care has an on-site strength rehabilitation facility equipped for progressive loading. That allows the program to move from light, controlled tendon work to leg press, squatting, single-leg strength work, and other meaningful loading as the athlete becomes ready for it — under direct clinical planning and supervision. With some athletes, the same tools allow a gradual reintroduction of plyometric drills specific to their sport.
Nutrition and recovery support
We also address the recovery environment that surrounds the loading program—adequate protein intake, vitamin D status, and, for some patients, collagen or gelatin with vitamin C taken shortly before loading sessions, which has mechanistic support for enhancing tendon collagen synthesis. Nutrition supports the rehabilitation program; it does not replace it.
Recovery Timeline, Return to Sport, and Preventing Recurrence
With carefully designed treatment and a structured, progressive loading program, most patients achieve meaningful symptom reduction and return to sport. Recovery tends to take longer in athletes who continue high-volume jumping without modifying load, and chronic cases (symptoms beyond six months) generally take longer to resolve—but they are not treatment-resistant, and persistent findings on imaging do not predict a poor outcome. True patellar tendon rupture is rare and is more strongly associated with a history of corticosteroid injection and large pre-existing degeneration on MRI than with loading-based rehabilitation itself.
Recurrence risk is highest in athletes who return to full jump training before tendon capacity has actually been restored, and roughly 20–30% of patients eventually develop symptoms in the opposite knee. This underscores the importance of continuing the rehabilitative program to completion and the implementation of evidence-based prevention strategies including progressive pre-season loading programs, capping weekly jump counts, ongoing landing-mechanics coaching, optimizing ankle flexibility, and avoiding sudden changes in training-surface hardness.
Dealing With Jumper’s Knee That Won’t Quit?
If pain below your kneecap is limiting your jumping, squatting, or training, our Walnut Creek sports chiropractic clinic offers accurate assessment and a properly staged rehabilitation program designed to get you back to full training with confidence. We serve Walnut Creek, Lafayette, Danville, Concord, Pleasant Hill, and greater Contra Costa County.
Request Your AppointmentPatellar Tendinopathy FAQ
What is patellar tendinopathy, and is it the same thing as “jumper’s knee”?
Yes. “Jumper’s knee” is the common name for patellar tendinopathy—pain and tissue changes at the patellar tendon, most often at the inferior pole of the kneecap, caused by repetitive jumping and landing loads.
How do I know if my knee pain is patellar tendinopathy and not something else?
The classic pattern is focal tenderness right at the bottom of the kneecap, pain that is worse with jumping, squatting, and standing up after sitting, and pain reproduced by a slow single-leg squat on a decline. There is no substitute for a professional, carefully conducted, focused exam to separate patellar tendinopathy from other causes of anterior knee pain.
Do I need an MRI or ultrasound to diagnose jumper’s knee?
Not usually. Many cases can be accurately diagnosed from a careful history and physical examination. When imaging is necessary we generally prefer MRI, and it is most useful when the symptoms are severe, when we are concerned about a partial tear, when suspected advanced tendinopathy needs to be defined, or when we wish to expedite case referral to an orthopedic surgeon.
Should I stop jumping and squatting completely?
Usually not entirely. Reducing the highest-impact loads while maintaining low-irritation conditioning and starting appropriate kinetic chain and tendon loading/strengthening tends to work better than complete rest, which can leave the tendon less prepared for the load it will eventually need to handle again.
Is rest enough to fix patellar tendinopathy?
Rest alone often reduces pain temporarily but does not rebuild the tendon’s capacity to tolerate jumping and landing, which is why symptoms commonly return once training resumes. Progressive, tendon-specific loading accompanied by kinetic chain strengthening is the evidence-based cornerstone of recovery.
What is the single-leg decline squat test?
It is a slow, controlled single-leg squat performed on a decline that can be useful for reproducing and monitoring patellar tendon symptoms. It is one piece of the clinical assessment, not a stand-alone diagnostic test. Variations of decline-squat loading may also be used later in rehabilitation when appropriate.
Can chiropractic care alone resolve jumper’s knee?
Chiropractic and manual therapy can help with hip, ankle, and movement issues that contribute to the problem, and can reduce pain along the way—but tendons get stronger mainly through progressive, well-dosed loading, not through manual treatment by itself. That’s why we combine sports chiropractic assessment with staged loading and supervised strength rehab, rather than relying on manual care alone.
How long does recovery typically take?
Recovery varies with symptom duration, severity, training demands, and the tendon’s response to loading. Symptoms may begin improving before full tendon capacity has returned. When established tendinopathy is present, a structured loading program commonly unfolds over a period of roughly 12–16 weeks, and longer-standing cases may take longer. Return to sport should be based on function and load tolerance rather than the calendar alone.
Where is Performance Sport Care located?
Performance Sport Care is located at 1776 Ygnacio Valley Road, Suite 106, Walnut Creek, CA 94598. Call (925) 945-1155. We serve Walnut Creek, Lafayette, Danville, Concord, Pleasant Hill, and greater Contra Costa County.
The office is a short walk from John Muir Medical Center, next door to the Walnut Creek Tennis Club, and just steps from Heather Farm Park, with convenient on-site parking. Ygnacio Plaza and Sports Basement are directly across the street.
Selected References
- Cook JL, Khan KM, Kiss ZS, Purdam CR, Griffiths L. Prospective imaging study of asymptomatic patellar tendinopathy in elite junior basketball players. J Ultrasound Med. 2001.
- Rio E, Kidgell D, Purdam C, et al. Isometric exercise induces analgesia and reduces inhibition in patellar tendinopathy. Br J Sports Med. 2015.
- Visnes H, Bahr R. The evolution of eccentric training as treatment for patellar tendinopathy (jumper’s knee): a critical review of exercise programmes. Br J Sports Med. 2007.
- 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.
This article is educational and not a substitute for personal advice from a licensed health care provider. Exercises or recommendations that are appropriate for one person may not be appropriate for another, particularly if a history of pain or injury exists. If you have persistent or worsening pain, pain that radiates into an extremity, pain that is accompanied by fever, or any other unusual symptoms please consult a qualified provider for an individual evaluation or dial 911 in case of emergency.
