Pain under the knee when Stretching into splits: causes and how to avoid it
Greetings, friends! My name is Vyacheslav Komakha. For more than 15 years I have been professionally engaged in Stretching and helping people return their body to its natural flexibility, lightness and health. My technique is based on the unique system of Mukhtar Gusengadzhiev, the most flexible person on the planet, listed in the Guinness Book of Records. Over the years of practice, thousands of students have passed through my hands, and if there is a problem that people come to me with most often when trying to do the splits, then this is it - a sharp, pulling, debilitating pain right under the knee.
A familiar picture: you are full of determination, sit down on a longitudinal or transverse splits, stretch with all your might, and suddenly... instead of a pleasant feeling of tension in the thigh muscles, you feel as if there is a steel string under your knee that is about to burst. The next day you can barely straighten your leg, and any attempt to return to exercise causes severe pain.
In this article, we will analyze in detail, from the point of view of anatomy and my many years of coaching experience, why this pain occurs, what critical mistakes you make and how to train so that you can do the splits absolutely safely, without injury or tears.
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Why does it hurt just under the knee? Anatomical educational program
To defeat the enemy, you need to know him by sight. When you feel pain under your knee, you need to understand: the muscles don't stretch there. In the popliteal fossa there is practically no muscle tissue capable of elastic Stretching. So what is it that hurts so desperately?
Tendons and ligaments: where they are thin, they tear
The back of the thigh consists of three large muscles: biceps femoris, semitendinosus and semimembranosus. All of them in their lower part turn into strong, dense tendons that pass directly behind the knee joint and are attached to the lower leg.
Tendons by their nature are extremely inelastic. Their job is to transfer force from muscle to bone and stabilize the joint rather than stretch. When you force the stretch with your knees completely straight and locked, all the stress is transferred from the belly of the muscle (which is located in the middle of the thigh) to these same tendons under the knee. They become overstretched, microtears appear in them, and an inflammatory process (tendinitis) begins.
Popliteus muscle and sciatic nerve
Another culprit of pain is the deep popliteal muscle (musculus popliteus). It is small, but very important: it is responsible for “unlocking” the knee when bending. If the splits technique is incorrect, it goes into a protective spasm.
In addition, the large sciatic nerve passes through the popliteal fossa. If you stretch roughly, sharply and overcoming severe pain, the nerve trunks become overstrained and signal the brain about the mortal danger with a sharp, “shooting” pain. This is a protective reaction of the body that should never be ignored.
“Remember the main rule of my school: pain is not a sign of progress. Pain is your body's cry for help. If you pull with force, you don’t bring the splits closer, but push them back for months of rehabilitation.”---
The main mistakes that lead to pain behind the knee
There was a case in my practice. A girl, Alina, came to me after she had been unsuccessfully trying to do the splits for six months in one of the popular fitness studios. At each lesson, the trainer literally “put pressure” on top of her, ignoring her complaints about a burning sensation under her front knee. As a result, Alina suffered a chronic tear of the semitendinosus tendon. It was painful for her to even just walk up the stairs, let alone exercise. It took us three months of gentle therapy and correct biomechanics to simply remove the pain syndrome, and only then we began to carefully regain flexibility.
What mistakes did Alina make (and most of you make)?
Mistake #1: “Closed” (overextended) knee joint
When you straighten your leg into a lock, the kneecap moves back and the joint hyperextends. In this position, the load is completely transferred from the target muscles of the back of the thigh to the ligamentous apparatus of the knee. This is the most common cause of injury.
Mistake #2: Trying to do the splits “at any cost” (the “No pain, no gain” principle)
This Soviet sports approach is good for Olympians whose careers last several years, but is disastrous for the average person who wants to be healthy and flexible at 30, 40 and 50 years old. When you experience sharp, burning pain, your brain activates a protective stretch reflex (myotatic reflex). The muscles contract convulsively to save the joint from destruction, and you continue to press. The result is microtears and tissue scarring.
Mistake #3: Wrong direction of the foot and pelvis
When Stretching to a longitudinal splits, the pelvis must be strictly closed (both ilia face forward). If the pelvis “opens”, the leg goes into rotation, the load on the knee joint is distributed unevenly, twisting the knee and injuring the lateral and popliteal ligaments.
Mistake #4: No or poor warm-up
Cold Stretching is a direct route to a traumatologist. Cold tendons are like dry wood: they don't bend, they break. Without preliminary warming up the joints and a light cardio warm-up, it is strictly forbidden to start doing the splits.
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How to avoid knee pain: A practical guide by Vyacheslav Komakha
Now let's move on to practice. How can you stretch in a way that keeps your knee joints safe while effectively lengthening your thigh muscles? Here are a few golden rules of my method that you can apply in your next workout.
1. “Soft knee” rule (micro-bend)
This is the simplest and most effective life hack. When performing any bends towards the legs or approaches to the splits bend the knee of your working leg slightly (literally by 2-3 degrees). Visually, the leg may appear almost straight, but the joint should not be blocked.
What does this give? The microflex instantly releases excess tension from the hamstrings and redirects all the stress directly to the center of the hamstring (the belly of the muscle). You will feel that it is the muscle that is Stretching - deeply, softly and pleasantly, without that nasty “string” under the knee.
2. Toe direction: “towards you” or “away”?
Experiment with foot position.
- If you pull up your sock on yourself (flex), you additionally stretch the calf muscle and the fascial chain. This increases the tension under the knee. If it already hurts there, relax your foot.
- Pull out the toe Push (point). This will relax the calf muscle and reduce stress on the hamstrings, allowing you to concentrate on the hip.
3. Work through relaxation and breathing
Mukhtar Gusengadzhiev’s technique, which I practice and teach, is based on complete mental and physical relaxation. Forget about springing movements (ballistic Stretching). Take a static position in which you feel a tension of 4-5 points on a scale of 10 (where 10 is unbearable pain).
Take a deep breath through your nose, and as you exhale, mentally “release” the tension from the work area. Direct your exhalation to the thigh and popliteal fossa. After 30-40 seconds, you will feel how the body itself drops lower, without any pressure from above.
4. Using props (blocks, pillows)
Feel free to use the equipment. If you are doing a seated forward bend or lunge, place a soft cushion or rolled-up towel under your knee. When entering the longitudinal splits, be sure to rest your hands on special yoga blocks or chairs to control your body weight and not overload your legs.
---What to do if your hamstring is already injured?
If you are reading this article after an injury has already occurred, and your knee ache even with normal walking, here is your rehabilitation action plan:
- Complete rest (for a while). Eliminate any Stretching exercises on that leg for at least 7 to 10 days. Allow micro-tears to heal. If you continue to pull the injured tendon, rough scar tissue will form at the site of the microtears, which is even less prone to Stretching, and the injury will become chronic.
- Cold in the first 48 hours. If the pain is severe and accompanied by swelling, apply ice through a towel for 10-15 minutes several times a day.
- Soft self-massage. Do not touch the popliteal fossa itself (lymph nodes and large vessels pass there!). But gently massage with your hands or a massage roll (MFR) the muscles of the lower leg and the back of the thigh above the knee. This will improve blood flow and speed up regeneration.
- Gradual return via download. Tendons love static pumping. Start doing gentle hamstring strengthening exercises (such as heel-focused glute bridges) without Stretching. A strong muscle holds the load better.
Important: If the pain does not go away within two weeks, interferes with your daily life, or is accompanied by severe swelling and crunching, be sure to consult a traumatologist or sports rehabilitation specialist for an ultrasound or MRI.
---Trainer's resume
The splits stretch is not a pain endurance competition. It is the art of listening and understanding your body. Pain under the knee is always a marker of error: either you are in too much of a hurry, or your technique is broken.
Restructure your workouts according to the principles I described above:
- Always leave the knee slightly soft.
- Stretch as you exhale and only through relaxation.
- Never let anyone put pressure on you from above.
- Respect your body's pace - it's different for everyone.
Only such a reasonable, careful approach will allow you to do a beautiful, deep splits, preserving the health of your joints for many years. Remember: flexibility is youth, and youth should be painless!