Patellar Tendinopathy (Jumper's Knee) Treatment: PRP, Shockwave, and Recovery

Patellar tendinopathy, commonly called "jumper's knee," is a degenerative condition of the patellar tendon, typically at its origin at the inferior pole of the patella. It's the classic tendinopathy of jumping athletes (basketball, volleyball, high jump, long jump) but appears in any athlete who loads the extensor mechanism repetitively, including runners, cyclists, weightlifters, and active middle-aged adults who increase load too quickly.

This guide covers what patellar tendinopathy is, why it's stubborn, and how an evidence-based combined protocol of eccentric loading, shockwave, and PRP gets most patients back to their sport.

What patellar tendinopathy actually is

The patellar tendon connects the lower pole of the patella (kneecap) to the tibial tubercle (the bump on the front of the upper shin). It's actually a ligament by strict definition (connecting bone to bone), but is universally called the patellar tendon. It transmits the force of quadriceps contraction to the tibia, enabling knee extension and the propulsive phase of jumping.

Patellar tendinopathy involves degenerative changes at the proximal patellar tendon: disorganized collagen, abnormal neovascularization, microscopic tearing, mucoid degeneration. The dominant pathology is at the deep, posterior fibers near the inferior pole of the patella.

The contemporary term is patellar tendinopathy; the older "patellar tendinitis" or "jumper's knee" terminology is still common in lay usage.

How it presents

Anterior knee pain, localized to the inferior pole of the patella. Worse with jumping, deep squatting, descending stairs, running uphill or downhill. Often a "post-static dyskinesia" pattern: stiff and sore after sitting, eases with brief activity, returns at the end of a longer session.

The pain is typically reproducible on exam with palpation of the inferior pole of the patella with the knee in extension. The Royal London Hospital test (palpation with the knee extended versus flexed) is positive when the area is tender in extension but less tender when the tendon is loaded under flexion.

Severity is often graded by the impact on athletic activity:

• Grade 1. Pain only after activity.
• Grade 2. Pain at the beginning of activity, eases during, returns after.
• Grade 3. Pain during activity, impairing performance.
• Grade 4. Pain preventing activity, possibly with tendon failure.

Imaging (ultrasound or MRI) often shows tendon thickening at the inferior pole, intratendinous signal changes, and sometimes small intratendinous tears or cysts. As with most tendinopathies, imaging findings can be present in asymptomatic athletes; clinical correlation is essential.

Who gets it

Patellar tendinopathy is heavily over-represented in:

Jumping sports. Basketball, volleyball, high jump, long jump. Estimated lifetime prevalence in elite volleyball players is 40 to 50 percent.

Sprinting and explosive lower-body sport. Track sprinters, soccer players in positions requiring acceleration and deceleration.

Sports with deep loaded knee flexion. Weightlifting (deep squats, Olympic lifts), cycling under heavy load.

Recreational athletes who increase load suddenly. Weekend warriors, new-to-the-sport adults, runners adding hill work too quickly.

Adolescent and young adult athletes during growth. Some overlap with Sinding-Larsen-Johansson syndrome (the patellar tendon equivalent of Osgood-Schlatter, occurring at the inferior pole of the patella in skeletally immature athletes).

The diagnostic differential

Anterior knee pain has many causes. Some that can mimic patellar tendinopathy:

Patellofemoral pain syndrome. Pain more diffusely around the kneecap, often worse with prolonged sitting and stair descent, less localized to the inferior pole.

Fat pad impingement (Hoffa's syndrome). Pain at the anterior knee, often with localized fullness or swelling, pain with full extension.

Quadriceps tendinopathy. Pain at the superior pole of the patella, where the quadriceps tendon attaches.

Patellar bursitis (prepatellar or infrapatellar). Localized swelling and pain at the bursa, often history of trauma or prolonged kneeling.

Sinding-Larsen-Johansson syndrome. In skeletally immature athletes, traction apophysitis at the inferior pole of the patella; self-limited with growth.

Osgood-Schlatter disease. Similar entity at the tibial tubercle, also in skeletally immature athletes.

Patellofemoral arthritis. Older patients, broader patellofemoral pain pattern.

The exam and targeted history sort most cases. Imaging when needed.

The conservative care foundation

The standard non-surgical treatment for patellar tendinopathy is structured eccentric loading. The Decline Squat Protocol (a 25-degree decline squat on a wedge) has the strongest evidence base.

The protocol. 3 sets of 15 repetitions of decline squats, twice daily, every day for 12 weeks. The decline angle is important; it loads the patellar tendon more than a standard flat-foot squat. The eccentric phase (the controlled descent) is the active part of the protocol; the concentric phase (standing back up) is assisted with the contralateral leg if needed.

The science. Eccentric loading produces tendon remodeling: improved collagen organization, reduction in aberrant neovascularization, improvement in tendon structural quality. The mechanism is similar to what eccentric loading does for Achilles tendinopathy.

Tolerable discomfort. Some pain during the loading is expected and acceptable up to a moderate level. The general rule: pain that's tolerable and stable from session to session is fine; pain that's increasing or limiting activity warrants modification.

Bahr's RCT (2006) compared the decline eccentric protocol to surgical treatment in chronic patellar tendinopathy and found no significant difference in outcomes at 12 months. Surgery was no better than disciplined eccentric loading in that study. This is the central reason most patellar tendinopathy patients shouldn't need surgery.

Shockwave for patellar tendinopathy

Shockwave has reasonable evidence for chronic patellar tendinopathy, particularly cases that have failed eccentric loading alone.

Protocol. Course of 4 to 6 sessions, spaced 5 to 10 days apart. Sessions run 8 to 15 minutes, targeting the inferior pole of the patella and the patellar tendon proximally.

Combined with eccentric loading. Stronger evidence for the combination than either alone.

Patient experience. Mild discomfort during sessions. Some local soreness for 1 to 3 days after each session. Normal activity throughout the treatment course with sensible load modification.

Expected response. 60 to 75 percent of patients with chronic patellar tendinopathy show meaningful improvement at 12 to 16 weeks.

Comparison to PRP. Vetrano and colleagues (2013) RCT compared shockwave to PRP for jumper's knee. Both modalities produced improvement; PRP had somewhat better outcomes at 12 months in some endpoints. The studies aren't head-to-head in a way that makes one clearly superior in all contexts. We often use both, sequentially or in combination, for the right patient.

PRP for patellar tendinopathy

PRP delivers concentrated growth factors directly into the affected tendon tissue.

Protocol. Ultrasound-guided injection of leukocyte-rich PRP into the affected patellar tendon, with the needle position confirmed throughout. Fenestration technique to maximize PRP distribution. Sometimes a second injection at 6 to 8 weeks for incomplete response.

Patient experience. Local anesthetic for comfort. Procedure itself brief. Some local soreness and potential inflammatory flare for 24 to 72 hours after.

Activity restriction. No jumping or maximal extension loading for 4 to 6 weeks. Light cardio, swimming, cycling at moderate effort, and most non-jumping activity is fine.

Expected response. Improvement typically begins at 4 to 8 weeks, continuing through 12 to 16 weeks. 60 to 75 percent of patients with chronic patellar tendinopathy show meaningful improvement. Filardo and colleagues published long-term follow-up showing sustained benefit at 4 years post-PRP for patellar tendinopathy.

The combined approach we typically use

For most chronic patellar tendinopathy patients at Apex:

Phase 1 (weeks 1 to 12). Structured decline squat eccentric loading program, twice daily. Shockwave course (4 to 6 sessions). Address training load, jumping volume, landing mechanics.

Re-evaluation at 12 weeks. If meaningful improvement, continue conservative measures with gradual return to full activity. If incomplete improvement, consider PRP.

Phase 2 if needed (weeks 12 to 24). PRP injection. Continued eccentric loading. Progressive return to activity.

Re-evaluation at 24 weeks. Most patients have substantially improved. Residual cases may need a second PRP, additional shockwave, or further evaluation.

Why we avoid cortisone

Cortisone injection into the patellar tendon (intratendinous) is associated with documented tendon rupture risk. Multiple case reports and case series document acute rupture after cortisone, particularly when injected directly into the tendon substance rather than around it.

Even peritendinous (around-the-tendon) cortisone is approached cautiously. The short-term symptomatic relief can be misleading; the underlying degenerative biology continues to progress, and the patient who returns to full activity feeling "fixed" is at risk for either symptom recurrence or, less commonly, more serious tendon failure.

We don't inject cortisone into the patellar tendon. The alternatives (PRP, shockwave, eccentric loading) deliver better long-term outcomes without the rupture risk.

What recovery looks like

For a typical mid-grade chronic patellar tendinopathy treated with the combined protocol:

Weeks 1 to 4. Beginning eccentric loading. Shockwave sessions every 5 to 10 days. Modified activity (reduced jumping, no maximal load, attention to landing).

Weeks 4 to 8. Continued loading. Last shockwave sessions. Early symptomatic improvement for many patients.

Weeks 8 to 12. Clear improvement for most responders. Continued loading. Progressive return to sport-specific activity.

Weeks 12 to 16. Most patients clearly better. Continued loading reduced from twice daily to once daily or less.

Weeks 16 to 24. Return to most sport. PRP if response is incomplete. Continued attention to load.

Months 6 to 12. Sustained improvement in responders.

For elite or competitive athletes, the protocol is often timed around the off-season to allow the full recovery window without competing demands.

When to think surgery

Surgical management for patellar tendinopathy (open or arthroscopic debridement of degenerated tissue, sometimes with removal of the inferior pole of the patella) is reserved for the small percentage of patients who fail:

• A full 12-week structured eccentric loading program
• A full shockwave course
• A PRP series

Recovery from surgery is 4 to 8 months, with gradual return to sport. As Bahr's RCT showed, outcomes from surgery are not better than well-conducted non-surgical care for most patients. Most patients who reach surgical consideration have very chronic, very refractory cases.

What you can do alongside treatment

Whatever the intervention, certain things help:

Strict adherence to the eccentric protocol. The patients who do best are the ones who actually do the loading consistently.

Quad and gluteal strength. General lower body strength supports the patellar tendon by reducing the relative load it has to absorb.

Hip and ankle mobility. Restrictions higher up the chain (hip flexor tightness) or lower (ankle dorsiflexion limitations) increase the work the patellar tendon has to do.

Landing mechanics. For jumping athletes, coaching attention to landing form (knees over toes, soft landing through the hips and ankles) reduces patellar tendon load.

Training load management. Sudden volume increases are a common precipitant. Maintain sensible buildups.

Footwear. For running athletes, appropriate footwear for surface and gait pattern.

Specific patient profiles

The 22-year-old college volleyball player with grade 3 patellar tendinopathy in season. Modified play to maintain participation if possible; aggressive eccentric loading; shockwave course planned around competition schedule; PRP timed for off-season if needed. Realistic plan to be back to full pre-season training.

The 38-year-old recreational basketball player with chronic right knee pain after a year of playing more frequently. Combined eccentric, shockwave, PRP approach. Return to pickup basketball by month 4 to 5.

The 45-year-old weightlifter who developed bilateral patellar tendinopathy after increasing squat volume. Bilateral protocol, load management, attention to depth and tempo of squats during recovery.

The 55-year-old hiker with persistent anterior knee pain after long descent. Different pattern; often more patellofemoral than purely patellar tendon. Workup carefully.

How to book

To request a consultation about your knee, request a consultation or call (972) 768-2328. We're at 2111 Kirkwood Blvd, Suite 110b, Southlake, TX 76092.

For competitive athletes, we coordinate treatment timing around competition and training schedules. Bring your training history and recent imaging if you have it.

A short note from Dr. Abdullah

Patellar tendinopathy rewards discipline. The athletes who do best are the ones who commit to the eccentric loading for the full 12 weeks, manage their jumping load intelligently, and trust that the tendon biology takes months to remodel. The combined protocol we use produces excellent outcomes for the majority of chronic cases, and surgery is rare. The hardest part is the patience required during a 3 to 6 month recovery; for most active patients, that recovery beats the alternative of chronic pain that interferes with the sport long-term.