Jockey’s Knee (Pre‑patellar Bursitis)

What is Jockey's knee (prepatellar bursitis)?

Pre‑patellar bursitis, commonly called Jockey’s knee, is inflammation of the thin, fluid‑filled sac (bursa) that lies directly in front of the kneecap (patella). The bursa acts like a cushion, allowing the skin and the patellar tendon to glide smoothly over one another. When the bursa becomes irritated, it fills with excess fluid, swells, and can become painful.

The condition is most frequently seen in people who spend a lot of time kneeling—such as horse‑riders, carpet installers, gardeners, and mechanics—hence the nickname “Jockey’s knee.” However, any activity or condition that repeatedly stresses the front of the knee can trigger it.

Common Causes

The inflammation may be “sterile” (non‑infectious) or “septic” (infected). The most frequent precipitating factors include:

• Prolonged kneeling: Direct pressure on the pre‑patellar bursa for hours at a time.
• Repeated friction or micro‑trauma: From activities such as crawling, flooring, or horse‑riding.
• Acute blunt trauma: A fall or a direct blow to the front of the knee.
• Infection (septic bursitis): Bacterial entry via a skin break, often caused by Staphylococcus aureus.
• Rheumatic diseases: Gout, rheumatoid arthritis, or calcium pyrophosphate deposition disease can inflame bursae.
• Obesity: Increased body weight adds chronic pressure on the knee’s anterior structures.
• Occupational exposure: Construction workers, carpet installers, and plumbers who kneel frequently.
• Improper footwear or biomechanics: Malalignment places extra stress on the pre‑patellar region.
• Previous knee surgery or injection: Scar tissue or contamination can predispose to bursitis.
• Systemic infection: In rare cases, bacteremia can seed the bursa.

Associated Symptoms

While the hallmark sign is swelling in front of the kneecap, patients often experience a cluster of accompanying symptoms:

• Localized pain that worsens with kneeling, standing up from a seated position, or flexing the knee.
• Visible bulge or “fluid‑filled sac” directly over the patella.
• Warmth and redness (more common with septic bursitis).
• Limited range of motion due to discomfort.
• Feeling of “tightness” or pressure when the knee is extended.
• Occasional crepitus (a crackling sensation) with movement.
• Systemic signs such as fever, chills, or malaise—these suggest infection.

When to See a Doctor

Most cases are mild and respond to home care, but prompt medical evaluation is warranted when any of the following occur:

• Swelling continues to increase after 48‑72 hours of rest and icing.
• Severe pain that interferes with walking or daily activities.
• Redness, heat, or skin breakdown over the knee.
• Fever ≥ 38 °C (100.4 °F) or chills.
• Pus‑like drainage from the knee.
• History of diabetes, immune compromise, or recent knee injection/surgery.
• Any sudden loss of knee function or inability to bear weight.

Early evaluation can differentiate sterile from septic bursitis, which requires antibiotics and sometimes drainage.

Diagnosis

Healthcare providers use a combination of history, physical exam, and selective investigations:

• Clinical exam: Palpation reveals a soft, fluctuant swelling directly over the patella. Tenderness and warmth point toward infection.
• Imaging:
  • Ultrasound: Quickly confirms fluid accumulation and can guide needle aspiration.
  • X‑ray: Usually normal but helps rule out fracture, osteoarthritis, or calcific deposits.
  • MRI: Reserved for complex or chronic cases to assess surrounding soft‑tissue involvement.
• Aspiration and laboratory analysis: If infection is suspected, the bursal fluid is drawn with a sterile needle and sent for:
  • Gram stain and culture.
  • Cell count and differential.
  • Crystal analysis (to detect gout or pseudogout).
• Blood tests: CBC, ESR, and CRP may be elevated in septic or inflammatory bursitis.

Treatment Options

Therapy is tailored to whether the bursitis is sterile or septic, and to the severity of symptoms.

Initial Home Care (Sterile Bursitis)

• Rest & activity modification: Avoid kneeling or prolonged standing for several days.
• Ice: Apply a cold pack (15 min, every 2‑3 h) to reduce swelling.
• Compression: Use an elastic bandage or a pre‑patellar “knee sleeve” to limit fluid buildup.
• Elevation: Keep the leg elevated above heart level when sitting.
• Over‑the‑counter analgesics: NSAIDs such as ibuprofen 400‑600 mg every 6–8 h (if no contraindications) help reduce pain and inflammation.

Medical Management

• Corticosteroid injection: A single intra‑bursal injection of triamcinolone may provide rapid relief for persistent sterile bursitis.
• Aspiration: Removal of excess fluid can relieve pressure and also provides material for culture if infection is a concern.
• Antibiotics: Indicated only for septic bursitis. Typical regimens include:
  • Oral dicloxacillin or cephalexin for MSSA‑susceptible infections (5‑7 days).
  • Clindamycin or TMP‑SMX if MRSA is suspected.
  • IV therapy for severe cases or immunocompromised patients.
• Surgical options: Rarely required, but in chronic or recurrent cases, bursectomy (removal of the bursa) may be performed.

Rehabilitation

After acute symptoms subside, a graduated program improves strength and protects the knee:

• Quadriceps‑setting and straight‑leg raises.
• Gentle range‑of‑motion exercises (heel slides, stationary cycling).
• Progressive resistance training for the thigh and hip abductors.
• Incorporate kneeling pads or cushions when kneeling is unavoidable.

Prevention Tips

Reducing repetitive pressure on the front of the knee is the most effective strategy:

• Use protective padding: Knee pads, foam cushions, or specially designed “jockey” pads disperse pressure.
• Modify work techniques: Alternate between standing and kneeling; use stools or low‑crouch platforms when possible.
• Maintain a healthy weight: Extra pounds increase constant load on the knee.
• Wear appropriate footwear: Shoes with good arch support improve overall lower‑extremity mechanics.
• Strengthen the lower limb: Strong quadriceps and glutes reduce stress on the patellar tendon and bursa.
• Stay hydrated and manage systemic conditions: Controlling gout, rheumatoid arthritis, or diabetes lowers the risk of inflammatory bursitis.
• Practice good skin hygiene: Clean any cuts or abrasions promptly to avoid bacterial entry.

Emergency Warning Signs

Key Take‑aways

Jockey’s knee is usually a benign, self‑limiting condition when managed early with rest, ice, and NSAIDs. Recognizing the signs of infection—fever, redness, drainage—and seeking prompt medical evaluation can prevent complications such as septic arthritis. For individuals whose occupations or hobbies require frequent kneeling, adopting protective padding and strengthening exercises is the cornerstone of prevention.

Sources: Mayo Clinic. “Prepatellar bursitis.”; Centers for Disease Control and Prevention. “Bacterial infections of the skin and soft tissue.”; National Institute of Arthritis and Musculoskeletal and Skin Diseases (NIAMS). “Bursitis”; Cleveland Clinic. “Knee Bursitis”; Arthritis Foundation. “Jockey’s Knee.” Peer‑reviewed articles from The Journal of Orthopaedic & Sports Physical Therapy (2021) and Clinical Infectious Diseases (2020).