Patellar and quadriceps tendinosis are chronic overuse conditions in which the tendon tissue undergoes degenerative change rather than acute inflammation. Patellar tendinosis (jumper’s knee) affects the patellar tendon just below the patella. Quadriceps tendinosis affects the quadriceps tendon at or above the patella. Both conditions present with chronic anterior knee pain in athletic patients and respond to progressive loading rehabilitation more reliably than to traditional rest-based treatment.
What Are Patellar and Quadriceps Tendinosis?
Tendinosis is degeneration of the collagen structure within a tendon, characterized histologically by disorganized fibers, increased ground substance, and neovascularization. It is not inflammatory in the traditional sense, which is why the older term tendinitis has largely been replaced. This distinction matters for treatment: anti-inflammatory approaches do not reverse degenerative tendon changes, while progressive loading rehabilitation can stimulate remodeling.
Patellar tendinosis most commonly affects the proximal patellar tendon just below the inferior pole of the patella, a region with relatively poor vascular supply that absorbs high eccentric loads during jumping and landing. Quadriceps tendinosis affects the quadriceps tendon at its insertion on the superior pole of the patella.
Causes and Risk Factors
- Jumping sports (basketball, volleyball, track high jump) for patellar tendinosis
- Heavy squatting and weightlifting for quadriceps tendinosis
- Training errors: sudden increases in volume or intensity
- Hard training surfaces
- Poor landing mechanics
- Quadriceps, hamstring, or calf inflexibility
- Prior tendon injury
- Age 20 to 40 is the most common presentation, though the condition occurs at any age
Symptoms
- Localized pain at the inferior pole of the patella (patellar) or superior pole of the patella (quadriceps)
- Pain graded by activity demand, ranging from pain only after training to pain that prevents performance
- Pain with jumping, landing, deep squatting, and stair descent
- Morning stiffness
- Tenderness to direct palpation over the involved tendon
- Pain that gradually progresses over weeks to months
Diagnosis
Dr. Chudik’s evaluation includes the sport and training pattern, the pain duration, and a physical examination focused on localized tenderness, palpable thickening, and reproducibility of pain with single-leg squats or jumping activities. X-rays are usually normal but can show calcification within the tendon in chronic cases. Ultrasound and MRI characterize tendon structure and identify partial tears that would change treatment. The Westmont office has on-site high-field MRI.
Treatment
Non-surgical treatment is the first line for all tendinosis. The cornerstone is progressive loading rehabilitation rather than rest alone. Treatment components include:
- Activity modification: reducing but not eliminating load during the early treatment phase
- Eccentric strengthening exercises for the quadriceps (decline squats for patellar tendinosis)
- Heavy slow resistance training in progressive protocols
- A targeted physical therapy program addressing the whole kinetic chain (hip, core, ankle mechanics)
- Extracorporeal shock wave therapy in refractory cases
- Platelet-rich plasma (PRP) injection as an adjunct in refractory cases
- Corticosteroid injection is avoided in tendinosis because it can weaken the tendon and increase rupture risk
Surgery is reserved for cases that fail six to 12 months of dedicated non-surgical treatment. Dr. Chudik performs tendon debridement, excising the degenerative tissue and stimulating healthy tendon regeneration through small incisions.
Recovery and Outcomes
Recovery with non-surgical treatment typically requires three to six months of dedicated rehabilitation for full resolution, with gradual return to sport over that period. Shortcut attempts (rest alone, early steroid injection) tend to prolong the course.
Outcomes after surgery are generally good but slower than most sports surgery recoveries, with return to full sport typically six to nine months after debridement. Addressing the underlying training and mechanics is essential to prevent recurrence.
When to See Dr. Chudik
Schedule an evaluation if anterior knee pain has persisted beyond six to eight weeks of reduced activity, if pain prevents participation in your sport, or if prior treatment has not resolved symptoms. Call 630-324-0402 or request an appointment online.