Pain in the Back of Knee When Straightening Leg After Sitting
Back-of-Knee Pain? Here’s How to Stand Up to It!
Experiencing pain in back of knee when straightening leg after sitting can be both frustrating and concerning. Whether it’s a dull ache or a sharp discomfort, this pain can make everyday movements challenging, affecting your mobility and quality of life. Several factors, such as muscle tightness, tendon strain, or underlying joint issues, could be contributing to this discomfort. Fortunately, expert orthopedic care can help address the root cause and provide lasting relief.
Dr. Hesham Al Khateeb, a highly skilled orthopedic surgeon, offers comprehensive diagnosis and treatment options tailored to your condition regarding pain behind knee when straightening leg, ensuring a personalized approach to restoring comfort and function.

Understanding Pain in Back of Knee When Straightening Leg
The knee is a complex joint that relies on multiple muscles, ligaments, and tendons to function smoothly. Pain behind knee when straightening leg can result from strain, overuse, injury, or underlying medical conditions. This discomfort can feel like a dull ache, a sharp pain, or stiffness that worsens after prolonged sitting. Identifying the root cause is the first step toward effective treatment and relief.
Answers to your question – ‘Why does the back of my knee hurt when I straighten it?’
Several factors may contribute to pain in back of knee when straightening the leg.
Some of the most common causes include:
1. Hamstring Tendonitis
Hamstring tendonitis occurs when the tendons connecting the hamstring muscles to the knee become inflamed due to overuse, excessive stretching, or injury. This can cause tightness and pain behind knee when straightening or extending the leg.
2. Baker’s Cyst
A Baker’s cyst is a fluid-filled sac behind the knee that can develop due to excessive fluid buildup in the joint. This is why back of knee hurts when straightened or may cause a sensation of tightness and pain.
3. Popliteus Muscle Strain
The popliteus muscle, present at the back of the knee, plays an imperative role in stabilizing the joint. Strain or irritation of this muscle can lead to pain, especially when transitioning from a seated to a standing position.
4. Meniscus Tear
Knee pain when straightening leg may also be a result of a meniscus tear. The meniscus is a piece of cartilage that cushions the knee joint. A tear in the meniscus can contribute to pain, swelling, and restricted movement, particularly when straightening the leg.
5. Deep Vein Thrombosis (DVT)
In some cases, pain in the back of the knee and calf after sitting could indicate deep vein thrombosis – a condition where a blood clot develops in a deep vein. This is a serious medical concern and requires immediate attention.
6. Arthritis
Both osteoarthritis and rheumatoid arthritis can lead to pain behind knee and calf after sitting, particularly after periods of inactivity. Arthritis-related inflammation can cause discomfort when moving the knee.
Symptoms Associated with Pain in Knee When Straightening
Apart from pain, individuals may experience additional symptoms, including:
- Swelling or stiffness
- A popping or clicking sensation
- Limited range of motion
- A feeling of instability in the knee
- Redness or warmth (which may indicate an infection or inflammation

Treatment & Relief for Back of Knee Pain When Straightening the Leg
Finding the ideal treatment depends on the cause of your knee pain.
Here are some effective treatment options:
Rest & Activity Modification
Avoiding activities that aggravate the pain can help in the healing process. Taking breaks, reducing excessive bending, and minimizing strain on the knee can provide relief.
Cold & Heat Therapy
Applying an ice pack can aid in reducing inflammation and pacifying the pain, while heat therapy can improve blood circulation and ease muscle stiffness.
Physical Therapy & Stretching
Stretching and strengthening exercises for the hamstrings, quadriceps, and calf muscles can improve flexibility and bring down strain on the knee. A physical therapist can guide you with targeted exercises.
Pain Management with Medications
Nonsteroidal anti-inflammatory drugs (NSAIDs) can help decrease pain and inflammation. However, it’s recommended to consult an orthopedic specialist before prolonged use.
Knee Bracing & Support
If your knee hurts when straightening leg, using a knee brace or compression sleeve can provide stability and support, especially during physical activities.
Injections & Advanced Treatments
For persistent pain, corticosteroid injections, platelet-rich plasma (PRP) therapy, or other regenerative treatments may be recommended by an orthopedic specialist.
Surgical Interventions
If conservative treatments fail, surgical options like arthroscopic surgery for meniscus repair or cyst drainage may be considered.
How Dr. Hesham Al Khateeb Can Help
Dr. Hesham Al Khateeb is a highly experienced orthopedic surgeon specializing in knee pain management and treatment. He offers a comprehensive approach to diagnosing and treating back-of-knee pain with personalized care.
His expertise includes:
- Accurate Diagnosis: Utilizing advanced imaging techniques to pinpoint the exact cause of knee pain.
- Non-Surgical Treatments: Offering cutting-edge physical therapy, pain management solutions, and regenerative medicine.
- Minimally Invasive Surgery: Providing arthroscopic and other minimally invasive procedures to restore knee function effectively.
Comprehensive Rehabilitation: Ensuring a guided recovery plan to help patients regain mobility and prevent future injuries.
When to Seek Medical Help for Pain in Back of Knee When Straightening Leg After Sitting
If you experience chronic pain, swelling, or difficulty moving your knee despite home remedies, it is crucial to consult a specialist.
Signs that require urgent medical attention include:
- Severe swelling or redness
- Difficulty bearing weight on the affected leg
- Sharp or worsening pain
- Signs of infection, such as warmth and fever
Get the Right Treatment at the Right Time with Dr. Hesham Al Khateeb
As mentioned in the above sections, pain behind knee and calf after sitting or back of knee pain when straightening leg can stem from various causes, including tendonitis, muscle strain, or joint-related conditions. Identifying the underlying issue and seeking appropriate treatment is key to alleviating discomfort and restoring function.
Dr. Hesham Al Khateeb provides expert diagnoses and tailored treatment options, helping patients find lasting relief and improved mobility. If you’re struggling with knee pain, consulting a specialist can be the first step toward a pain-free life.