Subfacial prepatellar bursa

Looks like

A sac in front of the kneecap, deep to the thin fascia and above the tendon fibres.

What it does

Adds a gliding layer over the kneecap.

Keeping it well

Swells with the other prepatellar bursae after kneeling or a blow.

Related conditions

• ACL & meniscus injury
• Baker's (popliteal) cyst
• Chronic venous insufficiency
• Gout
• Growing pains
• Haemophilia & bleeding disorders
• Juvenile idiopathic arthritis
• Lyme disease
• Lymphatic filariasis (elephantiasis)
• Lymphoedema
• Marfan syndrome & connective tissue disorders
• Osteoarthritis
• Pseudogout (calcium pyrophosphate disease)
• Psoriatic arthritis
• Reactive arthritis
• Restless legs syndrome
• Rheumatic fever & rheumatic heart disease
• Rheumatoid arthritis
• Septic arthritis
• Systemic lupus erythematosus
• Temporomandibular joint disorder
• Varicose veins