What should you know about front knee swelling?

Swelling at the front of the knee can sit over the kneecap, within the joint, or behind the tissues around it. Repeated kneeling may irritate the prepatellar bursa. A twist during sport can injure the ACL or meniscus and may cause swelling, instability, or catching. A Baker's cyst usually creates fullness behind the knee rather than at the front. Knee osteoarthritis can cause activity-related stiffness and intermittent swelling, while gout may cause a suddenly painful, hot, swollen joint. The symptom does not identify one condition. Note how quickly swelling appeared, whether the knee locked, and whether you can bear weight.

Reduce impact, kneeling, deep bending, and twisting while the knee is swollen. Elevate the leg when resting and use a wrapped cold pack for short periods if it feels soothing. Gentle movement can help prevent stiffness, but do not force range or repeatedly test instability. Use a handrail on stairs and avoid sport until walking and basic bending are comfortable. A clinician may examine stability, meniscal signs, and the location of fluid. Joint aspiration is sometimes used to remove fluid or help identify its cause, depending on the assessment.

Seek prompt care for a hot, red, very painful knee, fever, or feeling unwell, because infection needs urgent evaluation. Arrange assessment after a twist or impact if swelling appears quickly, the knee gives way, locks, or you cannot bear weight. New calf swelling, chest pain, or breathlessness requires urgent help. Persistent or recurrent swelling should be assessed even when pain is mild, especially if motion is becoming restricted.

Ask where the fluid is located, what examination findings suggest, whether imaging or aspiration is needed, and which movements and exercises are safe while swelling settles.