Back of the Knee Pain: Diagnostic & Treatment
The back of the knee, known clinically as the popliteal fossa, is a complex anatomical crossroads. It houses vital structures including the posterior joint capsule, various tendon attachments, major blood vessels, and the sciatic nerve as it divides into its smaller branches. Because this area is deep and protected by several layers of tissue, pain in the back of the knee is often difficult for patients to pinpoint and even harder for general practitioners to diagnose without specialized imaging.
Pain behind the knee can feel like a “fullness,” a sharp catch, or a radiating ache that makes it difficult to fully straighten your leg or squat.
Pain in this region often stems from “mechanical” issues within the joint that cause fluid to escape into the surrounding tissues.
UNDERSTANDING THE BACK OF THE KNEE
The posterior aspect of the knee relies on a delicate balance of tendons and ligaments to maintain stability and facilitate movement:
The Popliteus Muscle: Often called the “key” to the knee, it unlocks the joint when you begin to bend it.
Gastrocnemius & Hamstrings: The large calf and thigh muscles that cross the back of the joint to provide power.
The Meniscus (Posterior Horn): The back sections of the knee’s shock absorbers, which are frequently subject to tearing during twisting movements.
Common Conditions
Baker’s Cyst (Popliteal Cyst): A fluid-filled swelling caused by an underlying joint issue (like arthritis or a meniscus tear) that creates a “pressure valve” effect at the back of the knee.
Popliteus Tendinopathy: Irritation of the small, deep muscle that helps unlock the knee joint.
Posterior Meniscal Tears: Damage to the back part of the cartilage, often causing pain when deep-squatting or twisting.
Distal Hamstring Tendinopathy: Strain at the attachment points of the hamstrings on either side of the back of the knee.
Gastrocnemius Strain: A tear or strain where the calf muscle attaches to the femur.
Treatment Approaches for Back of the Knee Pain:
Diagnostic Ultrasound Scan: The gold standard for identifying Baker’s cysts, tendon tears, or nerve entrapment in the popliteal fossa.
Ultrasound-Guided Aspiration: Safely draining a Baker’s cyst to relieve pressure and restore the ability to bend the knee.
Physiotherapy Exercises: Specific strengthening for the popliteus and hamstrings to improve joint tracking and stability.
Ultrasound-Guided Corticosteroid Injections: Precise delivery of anti-inflammatories to the source of the irritation to reduce fluid production.
Load Management & Modification: Guidance on adjusting activities like cycling or running that may be aggravating the posterior structures.
Soft Tissue Release: Specialized manual therapy to reduce tension in the calf and hamstring attachments.
Shockwave Therapy (ESWT): Effective for chronic tendinopathies around the knee joint.
You don’t have to live with a “tight” or “swollen” feeling behind your knee. By combining expert physiotherapy with advanced diagnostic technology, we bridge the gap between “dealing with the pain” and “resolving the injury.”
Ready to stop guessing and start healing?
Contact ProPlus Physio today for a specialist assessment and diagnostic scan.