Hypermobile knees occur when the knee joint moves beyond its normal range of motion, often bending slightly backward when you stand instead of stopping in a straight line. For many people, this extra flexibility causes no problems at all. But when hypermobility becomes symptomatic or is part of a connective tissue disorder like Ehlers-Danlos Syndrome (EDS) or Hypermobility Spectrum Disorder (HSD), the knee joint struggles to stabilize itself, leading to pain, instability, and increased injury risk. What Exactly Happens When Your Knees Are Hypermobile? A hypermobile knee displays a subtle backward or C-shaped curve when standing, rather than the straight alignment of a typical knee. The clearest sign is a slight hyperextension, where the knee locks out beyond its normal stopping point. This excessive range of motion might feel natural or even comfortable, but it places your entire body under unnecessary strain. The knee is particularly vulnerable because it sits between two major joints: your hip and your foot. When hypermobility affects the knee, it doesn't happen in isolation. Foot alignment and pelvic alignment both directly affect how your knee functions, which is why a whole-body approach to movement is essential. A problem at the foot or hip will often show up as knee pain. Among people with EDS, the knee ranks as the second most problematic joint, second only to the shoulder. Even more concerning, nearly 1 in 4 people with EDS experience knee subluxation, a partial dislocation where the joint shifts out of position but returns on its own. This doesn't require a full dislocation to be painful and disruptive to daily life. How Does Hypermobility Lead to Long-Term Damage? The consequences of untreated hypermobile knees extend far beyond immediate discomfort. Over time, the increased wear and tear on hypermobile knee joints can lead to early-onset osteoarthritis. The cartilage that cushions the knee may degrade faster, leading to pain, stiffness, and reduced function. Several factors contribute to knee pain in hypermobility, and they often work together rather than in isolation: - Patellar tracking issues: The kneecap can move out of normal alignment, especially during movement and when fatigued, causing patellofemoral pain under or around the kneecap. - Knee locking and hyperextension: Constant locking of the knees pulls the bones out of alignment, placing them under stress that causes irritation and inflammation. - Gait changes: Research shows that people with hEDS and HSD walk differently, with measurable differences in knee flexion and extension during movement. - Fascial changes: Altered fascial thickness and stiffness in the iliotibial tract, a band of tissue running along the outside of the thigh, may contribute to knee problems. - Muscle imbalances: Some muscles overcompensate for the lack of joint stability while others weaken, increasing the risk of injury and pain. Hyperextending the knees also has a chain reaction effect throughout your body. Locking the knees affects the pelvis, glutes, low back, and even the neck. Finding a soft knee, where you maintain a slight bend rather than locking it straight, is one of the most impactful changes you can make for your overall alignment. Why Proprioception Comes Before Strength Training One of the most important discoveries in managing hypermobile knees is understanding that proprioception, your sense of joint position and movement, must be addressed before strength training. People with hypermobility often have impaired proprioception, which affects balance and coordination and makes activities requiring precise knee movements more challenging. This is critical: loading a hypermobile knee before it has learned to control its range of motion can actually make things worse. Awareness and control must come first. The hyperextension of the knees that many people do habitually can impair proprioception, but there are specific exercises designed to improve this awareness. Steps to Support Your Hypermobile Knees - Start with proprioceptive training: Begin with exercises focused on body awareness and joint position sense before adding any resistance or loading to the knee joint. - Learn to maintain a soft knee: Practice standing and moving with a slight bend in your knees rather than locking them straight, which reduces strain on the entire kinetic chain. - Address foot and hip alignment: Work with a physical therapist to evaluate how your feet and hips affect your knee position, since problems in these areas often manifest as knee pain. - Improve your stair technique: Loading the joints correctly when going up and down stairs makes a significant difference in reducing strain on the knee. - Consider proprioceptive taping: Some people find that taping provides additional proprioceptive feedback and support, though this should be discussed with a hypermobility-aware physical therapist. The good news is that all of these issues can be addressed with movement therapy. Unlike surgical interventions, a movement-based approach focuses on teaching your body to control its range of motion and stabilize the knee joint through awareness and targeted exercises. If you notice your knees bend backward when standing, experience pain that comes and goes, or have difficulty with stairs and walking, it's worth discussing with a physical therapist or healthcare provider. Early intervention can prevent the progression to early-onset arthritis and help you maintain long-term knee health and function.
