Patellar Tendinitis – Jumper's Knee Explained
Patellar tendinitis, known as Jumper's Knee, is a painful overuse injury of the patellar tendon. Learn about its causes, symptoms, diagnosis, and treatment options.
Things worth knowing about "Patellar Tendinitis (Jumper's Knee)"
Patellar tendinitis, known as Jumper's Knee, is a painful overuse injury of the patellar tendon. Learn about its causes, symptoms, diagnosis, and treatment options.
What is Patellar Tendinitis?
Patellar tendinitis, commonly referred to as Jumper's Knee, is an overuse injury involving inflammation or degeneration of the patellar tendon. This tendon connects the kneecap (patella) to the shinbone (tibia) and plays a key role in extending the knee joint. The nickname Jumper's Knee reflects the fact that this condition most commonly affects athletes who perform repetitive jumping and landing movements.
Causes
The primary cause of patellar tendinitis is repetitive overloading of the patellar tendon. Contributing factors include:
- High-impact sports such as basketball, volleyball, and track and field
- Rapid increases in training volume or intensity without adequate recovery
- Muscular imbalances or weakness of the quadriceps muscles
- Poor biomechanics during running or jumping
- Training on hard or uneven surfaces
- Insufficient warm-up before physical activity
Symptoms
Symptoms typically develop gradually and may worsen without proper treatment. Common signs include:
- Pain below the kneecap, particularly during jumping, running, or climbing stairs
- Tenderness when pressing on the patellar tendon
- Morning stiffness or stiffness after prolonged sitting
- Swelling or warmth around the tendon
- Worsening pain during sustained physical activity
Grades of Severity
The condition is often classified into four grades, ranging from occasional pain only after activity to constant pain that significantly limits all physical activity.
Diagnosis
Diagnosis is based on a combination of clinical assessment and imaging studies:
- Medical history and physical examination: The physician reviews the onset of symptoms, sporting habits, and palpates the patellar tendon for tenderness.
- Ultrasound: Allows direct visualization of tendon thickening or structural changes.
- MRI (Magnetic Resonance Imaging): Provides detailed images of tendon tissue and helps detect tears or degenerative changes.
- X-ray: Used to rule out bony causes such as stress fractures.
Treatment
Conservative Treatment
Most cases of patellar tendinitis respond well to conservative management:
- Load reduction: Reducing or temporarily stopping painful activities
- Physiotherapy: Targeted strengthening exercises, especially eccentric quadriceps exercises
- Stretching: Regular stretching of the quadriceps and calf muscles
- Cryotherapy: Ice application to reduce pain and swelling
- Anti-inflammatory medications (NSAIDs): Short-term use for pain relief, e.g., ibuprofen
- Braces and taping: To offload the patellar tendon during daily activities and sport
Advanced Treatment Options
For more severe or treatment-resistant cases, additional interventions may be considered:
- Extracorporeal Shock Wave Therapy (ESWT): Promotes healing using acoustic pressure waves
- PRP Therapy (Platelet-Rich Plasma): Injection of growth factor-rich plasma derived from the patient's own blood to support tissue regeneration
- Surgical treatment: In persistent cases despite conservative therapy; involves removal of degenerated tendon tissue
Prevention
Patellar tendinitis can often be prevented through targeted measures:
- Thorough warm-up and cool-down routines before and after exercise
- Gradual progression of training intensity and volume
- Strengthening of the quadriceps, hamstrings, and hip muscles
- Use of appropriate footwear
- Adequate rest and recovery between intense training sessions
References
- Lian OB, Engebretsen L, Bahr R. Prevalence of jumper's knee among elite athletes from different sports. American Journal of Sports Medicine, 2005.
- Zwerver J, Bredeweg SW, van den Akker-Scheek I. Prevalence of Jumper's knee among nonelite athletes from different sports. American Journal of Sports Medicine, 2011.
- Malliaras P, et al. Patellar tendinopathy: clinical diagnosis, load management, and advice for challenging case presentations. Journal of Orthopaedic and Sports Physical Therapy, 2015.
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