Sometimes it slips, sometimes it stutters when climbing stairs or landing after a jump. In this blog post, you'll learn what an unstable knee is, what common complaints and causes are, and what you can do today. We'll also explain how Physiology can help you with assessment and a personalized plan.
What is an unstable knee?
With an unstable knee, movement feels less secure. You experience sinking, popping, or a clicking sound. Turning, slowing down, climbing stairs, or squatting can be uncomfortable. The cause can range from a recent twist to irritation of the capsule or ligaments, overuse of muscles around the knee, or residual pain from a previous injury. Important to know: instability is often a combination of stress, technique, and load capacity that are not properly aligned.
What does a knee popping feel like?
People describe it as a brief lurch in the joint, or as if the knee doesn't cooperate for a moment. You might hear or feel a click, followed by stiffness or swelling. Some movements become challenging, causing you to unconsciously avoid them. This, in turn, leads to less strength and control. If you recognize this pattern, it's time to carefully pace yourself and build up.
Symptoms that often accompany instability
- sinking or popping feeling when turning, squatting or climbing stairs
- pain on the inside or outside of the knee
- stiffness and difficulty fully bending or straightening
- swelling or warmth after loading
- clicking or stuttering during specific movements
- unsteady gait or slight limping
If you experience severe pain, a misalignment, locking symptoms, or are unable to bear weight after 24 to 48 hours, please contact your doctor or go to the emergency room.
Possible causes of an unstable knee
- recent sprain or twist during sports or a misstep
- bruise or strain of ligaments and capsule
- imbalance in strength and mobility around the hip, knee and ankle
- too rapid build-up of training or too little recovery
- technique, shoes or surface that do not match the load
- residual complaints after a previous injury or insufficient rehabilitation
Usually, multiple factors are at play simultaneously. Therefore, a plan that considers strength, mobility, and coordination works best.
When do you seek help?
Seek help if pain and swelling persist or worsen, your knee repeatedly gives way or locks, you walk unsteadily or continue to limp, or you have doubts about the correct structure or the cause of your symptoms. In these situations, it's wise to have a physiotherapist assess your progress so you can make early adjustments and prevent a pattern of avoidance and overuse.
Frequently Asked Questions
Often as sinking, unexpected hesitation, or a clicking sound when turning or landing. Sometimes swelling or stiffness follows after loading.
Sprain, bruise, irritation of the capsule or ligaments, imbalance in strength or mobility, too rapid build-up or residual complaints from a previous injury.
Only adapt and walk in a straight line. Avoid twisting and jumping until the pain and swelling are under control and your gait is stable.
Yes, as long as you build up gradually and perform it correctly. Combine activation, strength, and balance. Stop if you experience a significant increase in pain or swelling.
In case of persistent or increasing pain and swelling, repeated sagging, locking complaints, fever or wound problems.
How does Physi help with knee instability?
At Fysi, you start with a personalized intake. We listen to your story and assess your workload. We assess mobility, strength, stability, and gait, and look at the movements that trigger your complaints. Based on this, we create a personalized plan.
Do you want to know for sure what is causing the instability and how you can safely move on to walking, work or sports? Schedule your appointment at Physics.