Back of knee pain treatment depends on the condition causing the pain, and the most effective options include physiotherapy, targeted exercise, acupuncture, laser therapy, and manual soft tissue work. The area behind the knee, called the popliteal fossa, contains muscles, tendons, ligaments, and a network of blood vessels that can all become sources of discomfort when they are injured, inflamed, or under strain. Approximately 25% of adults experience frequent knee pain, according to a report published in American Family Physician, and posterior knee pain is one of the most common presentations we see at our clinic. This blog covers every major cause of pain behind the knee, explains when to seek professional help, and breaks down the treatment options that actually produce lasting results.

What Causes Pain in the Back of the Knee?

Pain in the back of the knee is caused by conditions affecting the muscles, tendons, ligaments, cartilage, or joint surfaces behind the knee. The popliteal fossa sits at the crease where the upper leg meets the lower leg. This region houses the hamstring tendons, the gastrocnemius muscle (the large calf muscle), the posterior cruciate ligament (PCL), portions of the meniscus, and the popliteal artery and vein. Damage or inflammation in any of these structures produces posterior knee pain.

The most common causes of posterior knee pain include Baker’s cysts, osteoarthritis, meniscus tears, posterior cruciate ligament injuries, hamstring strains, and tendinitis. Each condition behaves differently, produces a distinct pattern of symptoms, and responds to different treatment approaches. Baker’s cysts, for example, create a sensation of fullness or pressure behind the knee. Osteoarthritis produces a dull ache that worsens with weight-bearing activity. Meniscus tears often cause a catching or locking sensation alongside posterior pain.

Understanding which structure is involved determines which treatment pathway will actually resolve the problem. A physiotherapy assessment that evaluates how your knee moves under load, how the surrounding muscles fire, and where the pain reproduces is the starting point for effective treatment.

What Does It Mean When the Back of Your Leg Hurts Behind the Knee?

When the back of your leg hurts behind the knee, it means that one or more structures in the popliteal region are irritated, strained, or compressed. The specific character of the pain offers important clues about the cause. A sharp, pinching sensation during bending often points to a meniscus tear or a Baker’s cyst under pressure. A deep, aching pain that builds during walking or standing typically signals osteoarthritis or tendinitis. A sudden, intense pain after a sports collision or fall suggests a PCL injury or a hamstring strain.

Swelling behind the knee narrows the list further. A visible, smooth lump points toward a Baker’s cyst (popliteal cyst). A Baker’s cyst develops when excess fluid drains from the knee joint into a small pouch behind the knee, and data published in the journal Rheumatology International shows that Baker’s cysts appear in 5% to 38% of the general population, with peak incidence between ages 35 and 70. Diffuse swelling with warmth and redness, on the other hand, raises the possibility of a more urgent condition like deep vein thrombosis (DVT), which requires immediate medical attention.

Pain that radiates down the calf often involves the gastrocnemius muscle or the hamstring tendons where they attach near the knee. Gastrocnemius strains produce a pulling sensation at the top of the calf that worsens during push-off activities like walking uphill or climbing stairs. Hamstring strains, which account for 12% to 29% of all athletic injuries according to a 2025 study published in Arthroscopy, Sports Medicine, and Rehabilitation, produce pain higher in the posterior thigh that extends down behind the knee.

Does Arthritis Cause Pain in the Back of the Knee?

Yes, arthritis causes pain in the back of the knee, and osteoarthritis is the most common form of arthritis responsible for posterior knee symptoms. Osteoarthritis breaks down the smooth cartilage that lines the joint surfaces of the knee, producing friction, inflammation, and pain during weight-bearing activities. According to the Public Health Agency of Canada, approximately 3.9 million Canadians aged 20 and older live with diagnosed osteoarthritis, making it the most prevalent form of arthritis in the country.

Osteoarthritis of the knee typically develops gradually over years. The cartilage loss generates excess fluid inside the joint, and that fluid can migrate into the popliteal fossa and form a Baker’s cyst. A study published in BMC Musculoskeletal Disorders found that Baker’s cysts were present in 25.8% of patients with knee pain, with a strong positive association between Baker’s cyst formation and sonographic features of osteoarthritis. The combination of arthritis-related stiffness and a Baker’s cyst behind the knee produces the classic pattern of posterior knee pain that worsens after sitting and eases once you start moving.

Rheumatoid arthritis can also affect the knee, although it is less common. Rheumatoid arthritis involves the immune system attacking the joint lining, producing inflammation, swelling, and pain that tends to be symmetrical, affecting both knees rather than just one.

Can a Torn Meniscus Cause Pain Behind the Knee?

Yes, a torn meniscus can cause pain behind the knee, particularly when the tear involves the posterior horn of the medial or lateral meniscus. The menisci are two crescent-shaped pads of fibrocartilage that sit between the thighbone (femur) and the shinbone (tibia), functioning as shock absorbers and stabilisers for the knee joint. According to PM&R KnowledgeNow, meniscal injuries occur at a rate of approximately 61 per 100,000 people, with risk factors including male sex and age over 40.

Posterior meniscus tears produce pain behind the knee that worsens during deep bending, squatting, or twisting. A clicking or locking sensation during movement is a common symptom. Meniscus tears can result from acute trauma, such as a sudden twist during sports, or from degenerative changes that accumulate with age. Data from a New England Journal of Medicine study found that 35% of adults have some form of meniscal damage, and more than 40% of people over 70 have experienced a torn meniscus, according to WebMD.

Treatment for meniscal tears depends on the type, location, and severity of the tear. Many meniscal tears respond well to conservative treatment that combines exercise rehabilitation with manual therapy to restore range of motion and rebuild strength in the muscles surrounding the knee.

How PCL Injuries and Hamstring Strains Affect the Back of the Knee

The posterior cruciate ligament (PCL) and the hamstring muscles are two major structures that sit directly behind the knee, and injury to either one produces significant posterior knee pain. The PCL is the strongest and largest ligament in the knee, connecting the thighbone to the shinbone across the back of the joint. According to Cleveland Clinic, PCL injuries make up less than 20% of all knee ligament injuries because the ligament requires substantial force to tear. Dashboard injuries during car accidents and falls onto a bent knee during sports are the most common mechanisms.

PCL injuries produce instability, pain behind the knee during kneeling, and discomfort when walking downhill or descending stairs. The estimated annual incidence of PCL injuries is approximately 2 per 100,000 people, according to Physiopedia. Treatment ranges from conservative rehabilitation for partial tears to surgical reconstruction for complete tears with instability.

Hamstring strains affect the tendons and muscles that run from the pelvis down through the back of the thigh and attach near the back of the knee. A hamstring strain produces sudden posterior thigh and knee pain, difficulty bending the knee against resistance, and tenderness along the muscle belly. Hamstring strains carry recurrence rates exceeding 30%, which makes proper rehabilitation critical. Chiropractic care combined with targeted exercise rehabilitation addresses the biomechanical patterns that predispose the hamstring to re-injury.

Comparing Common Causes of Posterior Knee Pain

Condition	Primary Symptom	Common Cause	Typical Treatment	Recovery Timeline
Baker’s Cyst	Fullness, pressure, stiffness behind knee	Excess joint fluid from arthritis or injury	Treat underlying cause; physiotherapy; aspiration if large	4 to 12 weeks (varies with underlying condition)
Osteoarthritis	Dull ache that worsens with activity	Cartilage degeneration from age, overuse, or prior injury	Exercise, manual therapy, weight management, laser therapy	Ongoing management; symptoms reduce within 6 to 10 sessions
Meniscus Tear	Clicking, locking, pain with bending or twisting	Acute twist or degenerative wear	Physiotherapy; surgery for severe or locked tears	6 to 12 weeks (conservative); 3 to 6 months (surgical)
PCL Injury	Instability, pain with kneeling or descending stairs	High-force impact to front of bent knee	Physiotherapy for partial; surgery for complete with instability	3 to 6 months (conservative); 6 to 12 months (surgical)
Hamstring Strain	Sudden posterior thigh/knee pain, weakness	Sprinting, overstretching, muscle imbalance	Progressive exercise rehabilitation, soft tissue therapy	2 to 8 weeks (Grade I-II); 3 to 6 months (Grade III)

Sources: Cleveland Clinic; PM&R KnowledgeNow; Public Health Agency of Canada; Arthroscopy, Sports Medicine, and Rehabilitation (2025); Physiopedia.

Is Posterior Knee Pain a Sign of Something Serious?

Posterior knee pain is usually not a sign of something serious, but in rare cases it can indicate deep vein thrombosis (DVT), which requires urgent medical attention. Most posterior knee pain results from musculoskeletal conditions like those described above, and these respond well to conservative treatment. However, a blood clot in the popliteal vein behind the knee produces symptoms that can mimic a Baker’s cyst or a muscle strain.

The key difference between a musculoskeletal cause and DVT lies in the accompanying symptoms. You should seek immediate medical attention if your posterior knee pain is accompanied by:

• Significant swelling in the calf or lower leg that develops rapidly
• Warmth and redness over the back of the knee or calf
• Pain that worsens when you flex your foot upward
• A fever or general feeling of being unwell
• Skin discolouration or a heavy, throbbing sensation in the leg

DVT is a medical emergency because the clot can break loose and travel to the lungs, causing a pulmonary embolism. Studies show that below-knee DVT constitutes up to 70% of DVT diagnoses in outpatient settings, according to a review published in Cardiovascular Diagnosis and Therapy. If you have any doubt, see a physician immediately.

How Do You Relieve Pain Behind the Knee?

You relieve pain behind the knee by reducing inflammation, protecting the injured tissue, and gradually restoring strength and mobility through progressive loading. Initial self-care focuses on the POLICE protocol, which is the current evidence-based approach to acute soft tissue injury management:

1. Protect the knee from further injury. Avoid activities that reproduce sharp pain. Use a brace or crutches if you cannot bear weight comfortably.
2. Optimal Loading means getting active sooner rather than later. Begin gentle, pain-free range of motion within the first 24 to 48 hours. Prolonged rest weakens the muscles around the knee and delays recovery.
3. Ice the area for 15 to 20 minutes every two to three hours during the first 48 to 72 hours. Wrap the ice in a cloth to protect your skin.
4. Compress the knee with an elastic bandage to manage swelling.
5. Elevate the leg above the level of your heart when resting to reduce fluid accumulation.

Self-care manages the initial pain and swelling, but most cases of persistent posterior knee pain require professional assessment and treatment to resolve the underlying cause. We recommend booking an assessment within the first week if your pain has not improved significantly with self-care alone.

How Does Physiotherapy Treat Posterior Knee Pain?

Physiotherapy treats posterior knee pain through a combination of manual therapy, joint mobilisation, targeted strengthening exercises, and movement retraining designed to address the specific cause of the pain. A systematic review published in PubMed found that physiotherapy exercise produces significant short-term improvements in both physical function and pain for knee patients, with standardised mean differences of -0.37 for function and -0.45 for pain compared to minimal intervention.

At our clinic, a physiotherapy assessment for posterior knee pain begins with a detailed movement analysis. We evaluate how the knee bends and straightens under load, test the integrity of the ligaments and meniscus, assess hamstring and calf flexibility, and identify any weakness or imbalance in the quadriceps, glutes, and hip stabilisers. The assessment findings determine the treatment plan.

Manual therapy techniques, including joint mobilisation and soft tissue release around the popliteal fossa, reduce pain and restore range of motion in the early stages of treatment. Progressive strengthening follows, focusing on the quadriceps, hamstrings, and calf muscles that support the posterior knee. The strength programme is adjusted at each visit based on how the knee responds. Most patients begin feeling improvement within the first few sessions, and a clear timeline is provided after the initial assessment. Here in Markham, our physiotherapists Rachel Marie Tan and Timothy Kwan work closely with each patient to build a plan that fits their condition and recovery goals.

Should You Stretch a Sore Hamstring Behind the Knee?

Yes, you should stretch a sore hamstring behind the knee, but only gently and only after the acute phase of the injury has passed. Stretching during the first 48 to 72 hours of a fresh hamstring strain can worsen the damage. Once the acute inflammation subsides, gentle hamstring stretching combined with progressive eccentric strengthening is the most effective approach for recovery.

Eccentric exercises load the hamstring while it lengthens, which stimulates tendon and muscle repair at the tissue level. Nordic hamstring curls are one of the most studied eccentric exercises for hamstring rehabilitation. The strengthening programme should also address the quadriceps and glute muscles, because weakness in these groups forces the hamstring to compensate, increasing the risk of re-injury. Hamstring strains carry recurrence rates exceeding 30%, according to research published in Arthroscopy, Sports Medicine, and Rehabilitation, and targeted rehabilitation is the most effective way to break that cycle.

How Acupuncture, Laser Therapy, and Massage Support Posterior Knee Recovery

Physiotherapy and exercise rehabilitation form the foundation of posterior knee pain treatment, but additional modalities can accelerate recovery and manage pain more effectively when combined into a coordinated plan.

Acupuncture reduces posterior knee pain by stimulating specific points in the muscle and nervous system to decrease pain signalling, release tight muscle bands, and improve local circulation. A landmark trial funded by the National Center for Complementary and Integrative Health found that acupuncture produced a 40% decrease in knee pain and nearly 40% improvement in function compared to baseline assessments. At our clinic, acupuncture is delivered by practitioners with McMaster University Contemporary Medical Acupuncture training and is often integrated directly into chiropractic or physiotherapy sessions.

Laser therapy using the Class IV K-Laser penetrates deep into the muscle, tendon, and joint tissue behind the knee to reduce inflammation and stimulate cellular repair. Across randomised controlled trials, Class IV laser therapy patients reported 30% to 50% reductions in pain scores on the Visual Analogue Scale, along with measurable improvements in range of motion and strength, according to a meta-analysis summary published by OSI STL. Laser therapy is painless, takes 5 to 15 minutes per treatment area, and requires no recovery downtime.

Massage therapy targets the soft tissue restrictions that develop around the posterior knee after injury or prolonged immobility. Deep tissue work on the hamstrings, gastrocnemius, and popliteal fascia releases adhesions, improves blood flow, and restores the tissue flexibility that allows the knee to move through its full range of motion. Combining massage with physiotherapy and exercise produces a more complete recovery because each modality addresses a different layer of the problem.

Can Poor Posture or Flat Feet Cause Knee Pain?

Yes, poor posture and flat feet can cause knee pain because the knee sits in the middle of a kinetic chain that runs from the foot through the hip and into the spine. When the foot overpronates (rolls inward excessively), the tibia rotates internally, which changes the alignment of the knee joint and increases stress on the posterior structures. Over time, this altered biomechanics can produce chronic posterior knee pain, even without a specific injury event.

Hip weakness contributes to the same problem from above. When the glute muscles fail to stabilise the pelvis during walking or running, the knee collapses inward (dynamic valgus), placing additional strain on the ligaments and tendons behind the knee. Addressing posterior knee pain without correcting the biomechanical factors that caused it leads to recurrence.

Custom orthotics correct the foot-level contribution to knee pain by supporting the arch and controlling excessive pronation. At our clinic, orthotics are cast after a full biomechanical assessment of how the foot, ankle, knee, and hip work together during gait. Correcting the foundation reduces the mechanical stress on the posterior knee structures and supports the results of physiotherapy and exercise rehabilitation.

Back of Knee Pain When Bending, Squatting, and Walking

Pain behind the knee during specific activities tells us which structures are under load and helps narrow down the treatment approach.

Back of knee pain when bending commonly results from a Baker’s cyst being compressed during knee flexion, a posterior meniscus tear catching between the joint surfaces, or tight hamstring tendons pulling against their attachment points. Treatment focuses on reducing the cyst or inflammation (when present), restoring full hamstring flexibility, and strengthening the surrounding muscles so the knee can bend without overloading the posterior structures.

Pain behind the knee when squatting places the posterior knee under maximum compressive and tensile load simultaneously. Squatting demands full range of motion in the knee, adequate hamstring and calf flexibility, and strong quadriceps and glute activation. When any of these components is lacking, the posterior structures compensate and produce pain. Progressive squat retraining, starting with partial range and building toward full depth as strength and flexibility improve, resolves most cases of squat-related posterior knee pain.

Posterior knee pain when walking is typically related to osteoarthritis, tendinitis, or a mild hamstring strain that flares during repetitive push-off. Walking produces relatively low forces through the knee compared to squatting or running, so pain during walking usually indicates either a chronic degenerative process or an acute injury that has not fully healed. Gait analysis identifies compensatory patterns, and a combination of manual therapy, exercise, and potentially orthotics corrects them.

Is Walking Good for Pain Behind the Knee?

Walking is good for pain behind the knee in most cases because gentle, low-impact movement promotes circulation, reduces stiffness, and supports long-term joint health. Research consistently shows that moderate physical activity, including walking, improves pain and function in people with knee osteoarthritis. The key is to walk within a pain-tolerable range and avoid pushing through sharp or worsening pain.

Walking becomes counterproductive if it aggravates acute inflammation or if the underlying cause involves instability, such as a PCL tear or a severe hamstring strain. In these cases, a period of modified activity followed by gradual reintroduction of walking under professional guidance produces better outcomes. We typically recommend starting with short, flat-surface walks and increasing distance by 10% to 15% per week as the knee tolerates the load.

How to Heal Knee Pain Naturally

Knee pain heals naturally through consistent movement, progressive strengthening, adequate sleep, weight management, and anti-inflammatory nutrition. The body’s healing systems work most effectively when they have the right inputs: regular gentle loading of the injured tissue, sufficient rest between loading sessions, and the nutritional building blocks for tissue repair.

Sleep quality directly affects recovery. Growth hormone, which drives tissue repair, is released predominantly during deep sleep. Sleeping with a pillow between or under the knees reduces pressure on the posterior knee structures and allows the joint to rest in a more neutral position. Maintaining a healthy body weight reduces the mechanical load on the knee joint. According to data from the Arthritis Foundation, every additional pound of body weight places approximately four extra pounds of force through the knee during walking.

Anti-inflammatory foods, including fatty fish, leafy greens, berries, and nuts, support the body’s natural healing response. Staying well-hydrated keeps the joint cartilage lubricated and functioning properly. These natural strategies complement professional treatment; they do not replace it when the underlying condition requires hands-on intervention.

Can Pain Behind the Knee Go Away?

Yes, pain behind the knee can go away, and most cases of posterior knee pain resolve fully with appropriate treatment. The timeline depends on the cause. Mild hamstring strains and tendinitis typically resolve within 2 to 6 weeks with proper rehabilitation. Baker’s cysts often shrink or disappear once the underlying condition (usually arthritis or a meniscus tear) is treated. Meniscus tears that are managed conservatively may take 6 to 12 weeks to reach full recovery.

Chronic conditions like osteoarthritis do not “go away” in the traditional sense, but symptoms can be managed effectively enough that they no longer limit daily activities. A systematic review of physiotherapy for knee osteoarthritis found that exercise programmes reduce pain and improve function with no adverse effects, and high-quality evidence confirms that exercise is one of the most effective non-surgical interventions for osteoarthritis-related knee pain. Approximately 80% of people with osteoarthritis have some degree of movement limitation, but structured rehabilitation can significantly reduce that limitation.

What Is the Best Treatment for Knee Pain in Old Age?

The best treatment for knee pain in old age is a multidisciplinary approach that combines gentle exercise, manual therapy, and supportive modalities to maintain mobility and manage pain without over-reliance on medication. Knee osteoarthritis affects approximately 12% of Canadian adults aged 20 and older, according to Statista data from 2021-2022, and the prevalence increases sharply after age 55. Women are disproportionately affected, with approximately 60% of osteoarthritis cases occurring in women, according to global epidemiological data.

For older adults, the treatment priority shifts from aggressive rehabilitation toward functional maintenance and pain management. Low-impact exercise such as walking, swimming, and cycling preserves joint function and muscle strength without placing excessive stress on degenerative cartilage. Manual therapy from a registered physiotherapist or chiropractor maintains joint mobility and reduces stiffness between visits.

Supportive modalities like medical acupuncture provide additional pain relief without the side effects associated with long-term medication use. The prevalence of knee pain has increased nearly 65% over the past 20 years, according to the American Family Physician, making proactive management in older adults more important than ever.

Frequently Asked Questions

What Is Your Knee Pain Telling You?

Your knee pain is telling you that a structure inside or around the knee is under stress, damaged, or inflamed. The location, timing, and character of the pain point to the cause. Posterior knee pain during bending suggests meniscal or Baker’s cyst involvement. Pain that worsens with weight-bearing activity suggests osteoarthritis or tendinitis. Pain after a sudden impact or twist suggests a ligament or muscle injury. Listening to the specific pattern of your knee pain, rather than ignoring it, allows you to seek the right treatment before the condition progresses.

What Sleeping Position Is Best for Knee Pain?

The best sleeping position for knee pain is on your back with a pillow under the knees, or on your side with a pillow between the knees. Both positions reduce pressure on the knee joint and keep the leg in a neutral alignment. Sleeping with the knee fully extended and unsupported can aggravate posterior knee pain by placing sustained tension on the hamstring tendons and the PCL. A small rolled towel under the knee provides gentle flexion that relieves pressure on the posterior structures.

How Can I Lubricate My Knees Naturally?

You can support knee joint lubrication naturally by staying hydrated, eating anti-inflammatory foods rich in omega-3 fatty acids, and keeping the joint active through regular low-impact movement. Synovial fluid, the body’s natural joint lubricant, is produced and distributed through the joint when the knee moves. Prolonged inactivity reduces synovial fluid production, which is why stiff knees feel better after a few minutes of gentle movement. Regular walking, cycling, or swimming keeps the joint surfaces well-lubricated.

How Long Does Posterior Knee Pain Take to Heal?

Posterior knee pain takes anywhere from 2 weeks to 6 months to heal, depending on the cause and severity. Mild hamstring strains and tendinitis typically resolve within 2 to 6 weeks. Baker’s cysts can take 4 to 12 weeks to resolve after the underlying condition is addressed. Meniscus tears managed conservatively require 6 to 12 weeks. PCL injuries and severe hamstring tears may take 3 to 6 months or longer. Early professional assessment shortens the timeline by identifying the cause and starting targeted treatment before compensatory patterns develop.

What Is the Difference Between a Baker’s Cyst and a Blood Clot Behind the Knee?

A Baker’s cyst is a fluid-filled sac that develops gradually behind the knee and feels like a smooth, movable lump. A blood clot (deep vein thrombosis) produces diffuse swelling, warmth, redness, and a deep aching or throbbing pain that worsens when you flex your foot upward. Baker’s cysts are not dangerous on their own, though they can be uncomfortable. A blood clot is a medical emergency that requires immediate treatment to prevent the clot from travelling to the lungs. If you are unsure which you are dealing with, see a physician the same day.

When Should You See a Doctor for Pain Behind the Knee?

You should see a doctor for pain behind the knee if the pain lasts more than a few days despite self-care, if you cannot bend or straighten the knee fully, if the knee buckles or locks, or if you notice swelling accompanied by redness, warmth, or fever. Any of these symptoms could indicate a condition that requires professional diagnosis and treatment. Waiting too long allows compensatory movement patterns to develop, which can create secondary problems in the hip, ankle, or lower back.

Putting It All Together

Pain behind the knee responds well to treatment when the cause is identified early and the right combination of therapies is applied. Whether your posterior knee pain stems from a Baker’s cyst, osteoarthritis, a meniscus tear, a hamstring strain, or a biomechanical issue that starts at the foot or hip, a multidisciplinary approach that coordinates physiotherapy, exercise rehabilitation, acupuncture, laser therapy, and manual care produces the most complete and lasting results.

At KC Rehab, we assess the full picture before recommending a single treatment. Our chiropractors, physiotherapists, and massage therapists work together under one roof so your care stays coordinated from the first assessment through to full recovery. If posterior knee pain has been limiting your movement, an initial assessment is the smartest next step. Call us at 905-205-1668 or book online to get started.