Knee pain is one of the most common musculoskeletal complaints worldwide, affecting people of all ages — from teenagers with growing pains to older adults managing osteoarthritis. Whether the pain is sharp and sudden or a persistent dull ache that never quite goes away, it has the capacity to dramatically limit daily function and quality of life.
This guide covers the most common causes of knee pain, what treatments have genuine evidence behind them, and how drug-free approaches — including electrotherapy — fit into a comprehensive pain management plan.
The knee is the largest joint in the body and one of the most mechanically demanding — bearing the full weight of the body with every step, carrying additional load during activities like climbing stairs or squatting. Several distinct conditions cause knee pain, and knowing which one you have matters enormously for treatment.
Osteoarthritis (OA) is the most common cause of knee pain in adults over 45. It is a degenerative joint disease in which cartilage — the protective tissue covering the ends of bones — gradually breaks down. As cartilage thins, bones begin to rub against each other, causing pain, stiffness, and inflammation. OA pain is typically worse after inactivity (morning stiffness), improves with gentle movement, and worsens again after prolonged use.
Often called 'runner's knee', patellofemoral pain syndrome (PFPS) is pain around the kneecap caused by abnormal tracking of the patella as the knee bends and straightens. It is the most common knee complaint in athletes and active individuals under 40. Pain is typically felt during squatting, stairs, prolonged sitting ('cinema sign'), and running downhill.
ACL (anterior cruciate ligament) and MCL (medial collateral ligament) sprains and tears are common in sports involving sudden changes of direction. They typically cause acute pain, swelling, and instability. Partial ligament injuries may be managed conservatively; complete ACL tears often require surgical reconstruction in active individuals.
The menisci are two C-shaped cartilage pads that act as shock absorbers in the knee. Tears can occur traumatically in younger people or degeneratively in older adults. Symptoms include joint line pain, swelling, and a catching or locking sensation.
Patellar tendinopathy ('jumper's knee') and quadriceps tendinopathy cause pain at the front of the knee, typically in athletes who run and jump. The tendon becomes chronically irritated and fails to properly recover between loading sessions.
The evidence for exercise in knee pain management is compelling across nearly all conditions. For osteoarthritis specifically, exercise therapy is as effective as medication for pain relief and superior for long-term function. The key muscles to strengthen are the quadriceps, hamstrings, hip abductors, and glutes — all of which reduce the load placed on the knee joint itself.
Walking, cycling, and swimming are ideal low-impact options. A physiotherapist can prescribe a specific strengthening programme appropriate for your diagnosis and current pain level.
For overweight individuals with knee OA, weight reduction is one of the most impactful available interventions. Each kilogram of body weight produces approximately three to four kilograms of force across the knee joint during walking. Even a modest weight reduction significantly reduces pain and slows disease progression.
Cold packs reduce acute inflammation and numb pain — most useful in the first 48–72 hours after an injury or flare. Heat relaxes surrounding muscles and improves circulation — better for chronic stiffness and ongoing ache. Alternating heat and cold is used by many patients for ongoing management.
Electrotherapy — including microcurrent electrotherapy (MET) — is used as an adjunctive pain management approach in knee conditions. The KFH Energy places electrode pads on either side of the painful knee, delivering gentle microcurrent stimulation that works at the cellular level to support pain relief.
KFH Energy is FDA-cleared for pain relief (510(k) K073008) and CE-marked as a Class IIa medical device. It is portable, drug-free, and can be used at home as often as needed as part of a broader knee pain management strategy.
Seek medical assessment for knee pain accompanied by significant swelling, instability, locking, inability to bear weight, or pain following significant trauma. These may indicate structural injury requiring imaging and specialist assessment. Do not delay assessment for progressive or severe pain.
DISCLAIMER: This article is for informational purposes only. Always consult a healthcare professional for diagnosis and treatment of knee pain. KFH Energy is an FDA-cleared pain relief device (510(k) K073008). Individual results may vary.
