Severe back knee pain since 3 weeks.

The symptoms you describe, especially severe pain starting behind the knee and extending into the calf and foot with difficulty bearing weight, need an in person examination. From the photograph there appear to be prominent superficial veins, but a photograph alone cannot determine the cause of the pain. A venous problem such as a deep vein thrombosis needs to be ruled out, particularly if there is new swelling, warmth, redness or tenderness of the calf.

Please get her assessed today by a physician or orthopaedic doctor. A clinical examination and, if indicated, a venous Doppler ultrasound of the affected leg would help rule out a blood clot. Depending on the examination, other causes such as nerve related pain or a knee problem may also need evaluation.

Until she is examined, avoid deep massage and avoid applying heat to the painful area. If she develops sudden breathlessness, chest pain, coughing with blood, or fainting, she should seek emergency medical attention immediately.

Clinical Impressions based on Symptoms: Sciatica / Lumbar Radiculopathy: Pain radiating from behind the knee down into the entire foot, accompanied by a feeling of tightness or nerve stiffness when straightening the leg, is classic for sciatic nerve irritation or compression (originating from the lower lumbar spine, e.g., L4-L5 or L5-S1 nerve roots). Baker’s Cyst (Popliteal Cyst): A fluid-filled sac behind the knee that often causes severe posterior knee pain, tightness when fully extending or bending the knee, and potential radiation down the calf/foot if tense or ruptured. Vascular Involvement (Varicose Veins / Venous Insufficiency): The visible bluish/dark tortuous lines visible on the back of the knee in the photo correspond to superficial dilated veins (varicose veins or spider veins). Venous congestion can worsen with local heat application (hot compress causes vasodilation, increasing pressure/stiffness). DVT Exclusion: While less likely given the absence of major localized lower leg swelling, acute severe pain with weight-bearing inability always warrants ruling out Deep Vein Thrombosis (DVT).

Immediate Medical Evaluation: Consult an orthopedic surgeon for an urgent clinical evaluation, as the patient is currently unable to bear weight or walk. Diagnostic Workup: Venous Doppler Ultrasound (Lower Limb): To rule out deep vein thrombosis (DVT) and evaluate venous reflux in the varicose veins. MRI of the Lumbar Spine & Knee: To evaluate for lumbar disc herniation causing nerve root compression (sciatica) and to check for a popliteal (Baker's) cyst or internal knee joint pathology. Physical Examination: A doctor will perform specific neurological tests (e.g., Straight Leg Raise test) and check peripheral pulses to pinpoint whether the primary driver is nerve-related or vascular.

Discontinue Hot Compression: Stop applying hot packs/presses immediately. Heat dilates blood vessels, which can exacerbate venous pooling, inflammation, and local nerve pressure. Rest & Elevation: Encourage resting with the leg elevated on a pillow to assist venous blood return and reduce pressure. Avoid Forced Bending or Extension: Do not force the knee to bend or stretch aggressively until a doctor confirms the exact cause. Red Flag Warning: Seek emergency medical care immediately if she develops sudden swelling in the calf, severe redness/warmth, fever, chest pain, shortness of breath, or progressive numbness/weakness in the foot (e.g., foot drop).

Please get personal consult with orthopedic specialist for better evaluation and management

Needs personalised evaluation