What is the recommended treatment for patellar tendinitis?

Treatment of Patellar Tendinopathy

The cornerstone of patellar tendinopathy treatment is eccentric strengthening exercises combined with relative rest, which should be the first-line approach for all patients. 1, 2

Understanding the Condition First

Patellar tendinopathy is not an inflammatory condition despite being commonly mislabeled as "tendonitis." Most patients presenting to primary care have chronic degenerative changes (tendinosis) rather than acute inflammation, which fundamentally changes how we approach treatment 1. This distinction is critical because anti-inflammatory strategies may actually inhibit healing rather than promote it.

First-Line Treatment: Conservative Management

Eccentric Exercise (Strongest Evidence)

Eccentric strengthening exercises have strong evidence as the most effective treatment and should be prescribed to all patients 1, 2, 3. These exercises involve lengthening the muscle-tendon unit under load, which stimulates collagen production and guides proper alignment of newly formed collagen fibers 1.

• Expected timeline: Most patients (approximately 80%) fully recover within 3-6 months with conservative treatment 1
• Continue activities that don't worsen pain, but avoid complete immobilization to prevent muscle atrophy 1
• Progressive tendon loading is essential—the tendon needs controlled stress to heal properly 4

Adjunctive Measures

Ice therapy: Apply ice through a wet towel for 10-minute periods for short-term pain relief 1. This reduces tissue metabolism and provides symptomatic relief, though it doesn't alter long-term outcomes.

Pain management: NSAIDs (topical or systemic) are effective for acute pain relief but cannot be recommended over other analgesics and have no effect on long-term outcomes 1. Use them sparingly and only for symptom control, not as primary treatment.

Second-Line Options for Refractory Cases

Corticosteroid Injections (Use with Caution)

Corticosteroid injections should be used cautiously and only for acute pain relief, as they don't alter long-term outcomes and may actually harm the tendon 1. The evidence shows:

• May provide better short-term pain relief than oral NSAIDs 1
• Do not inject into the tendon substance—only peritendinous injections if used at all 1
• Risk of reducing tensile strength and predisposing to spontaneous rupture 1

Emerging Biologic Treatments

Recent evidence suggests platelet-rich plasma (PRP) or bone marrow aspirate concentrate injections may be beneficial, particularly when combined with ultrasound-guided percutaneous tendon scraping 5. However, this remains an evolving area requiring further study.

Topical glyceryl trinitrate (GTN) combined with eccentric exercise showed the highest probability of effectiveness in network meta-analysis, though the evidence quality is low 6.

Other Modalities with Limited Evidence

• Extracorporeal shock wave therapy (ESWT): Appears safe and may be effective, but evidence is limited and it's expensive 1. Does not appear superior to sham ESWT when both groups perform eccentric exercises 6
• Orthotics/braces: Safe and widely used but lack strong evidence 1
• Therapeutic ultrasound, iontophoresis, phonophoresis: Insufficient evidence to recommend 1

Surgical Intervention

Reserve surgery for patients who fail 3-6 months of well-managed conservative therapy 1. Surgery is effective and involves:

• Excision of abnormal tendon tissue
• Longitudinal tenotomies to release scarring and fibrosis 1
• Open or arthroscopic approaches are comparable, though arthroscopic may allow faster recovery 7
• Consider surgery earlier for tears >50% of tendon thickness or tendons >8.8mm thick 5

Critical Pitfalls to Avoid

1. Don't label this as "tendonitis"—it's a degenerative condition, not inflammatory, which changes your entire treatment approach 1

2. Don't rely on corticosteroids as primary treatment—they may provide temporary relief but can weaken the tendon and don't improve long-term outcomes 1

3. Don't prescribe complete rest—the tendon needs controlled loading to heal properly. Relative rest with continued eccentric exercises is the goal 1

4. Don't expect quick results—set realistic expectations that recovery typically takes 3-6 months 1

5. Don't use NSAIDs as anything more than symptomatic relief—they won't heal the tendon 1

Treatment Algorithm

Step 1 (0-3 months): Eccentric strengthening exercises + relative rest + ice for symptom control + analgesics as needed for pain

Step 2 (if inadequate response at 3 months): Continue eccentric exercises + consider adding topical GTN or trial of ESWT

Step 3 (if inadequate response at 6 months): Consider PRP/bone marrow aspirate injections or surgical consultation

Step 4 (persistent symptoms after conservative failure): Surgical debridement 1, 5