Understanding Knee Cave Knee cave, or knee valgus, describes the inward collapse of the knees during squatting movements. Instead of tracking over the toes, the knees drift toward midline. This position strains the medial knee structures, ACL, and hip stabilizers. It also reduces power output and limits squat performance. Some degree of knee movement is normal, especially during maximal efforts. The problem arises when significant collapse occurs regularly, starting early in the movement, or happens under moderate loads. These patterns indicate underlying weakness or motor control issues that require correction. Knee cave typically results from weak hip abductors and external rotators, particularly the gluteus medius and deep hip rotators. When these muscles cannot control the femur, the knee falls inward under load. Research from the Journal of Athletic Training shows that hip strengthening programs reduce knee valgus by 40-60% in athletes. (PubMed) Contributing Factors Weak hip abductors: The gluteus medius controls the femur from collapsing inward. Weakness allows uncontrolled adduction and internal rotation. Weak external rotators: Deep hip muscles including piriformis and obturators resist internal rotation. Weakness contributes to inward knee drift. Poor motor control: Even with adequate strength, the pattern of letting knees fall in may be habitual. Conscious retraining changes the pattern. Foot mechanics: Flat feet and overpronation contribute to the kinetic chain dysfunction that causes knee cave. Start your 14-day free trial to access squat correction programs. Hip Strengthening Exercises These exercises build the hip abductor and external rotator strength to prevent knee cave. Hip Abduction JME 125 Holding onto a wall or your chair, extend one leg to the side. Standing Hip Control JME 127 Holding onto the wall or your chair, lift one leg to 90 degrees, return to the ground, then do the same with the other leg. Hip External Rotation JME 149 Either sitting or standing, straighten and extend one leg forward. Rotate that leg left and right and find your end range of motion each way. Stay slow and controlled. Single Leg Balance JME 140 Standing, while maintaining a 90 degree bend at your knee, lift your leg to find your end range of motion. Once found, return to the floor and do the other leg. Hip Mobility and Activation These exercises prepare the hips for proper squat mechanics. Hip Circles JME 144 For stability, hold onto your chair or desk with one hand. Follow the movement of your leg to the diagram very specifically. Ultimately, you are making a big circle with your knee. You want to be finding your end range of motion at each point. Be slow and controlled - this isn't a race. Find what works for your joints. Hip Rotation Mobility JME 134 One leg at a time, internally rotate your leg - either standing or sitting in your chair. Focus on the rotation - and do it controlled. Glute Activation JME 146 Either with your hands above your head or holding onto your chair, lift one leg up to 90 degrees. Then, bend at your hips to rotate your upper body toward the floor. Lateral Hip Work JME 128 Staying steady on one leg, follow the diagram for the path of your leg. Stay controlled with your movement and find your end range at every location. Cueing and Motor Control Knees out: Think about pushing knees out over the little toes throughout the squat. This cue activates external rotators and abductors. Spreading the floor: Imagine screwing your feet into the floor by rotating them outward (without actually moving them). This creates external rotation tension. Band feedback: Light bands around the knees during warm-up sets provide feedback and activate hip stabilizers. Remove for working sets. Pause squats: Pausing at the bottom of the squat reveals stability issues. Practice holding position with knees tracked properly. Common Mistakes Passive resistance: Allowing the band to push knees in while passively resisting does not build strength. Actively push outward against the band. Too much weight too soon: Working with loads that cause breakdown reinforces bad patterns. Use weights you can control properly. Ignoring warm-up: The hip stabilizers need activation before squatting. Skipping warm-up invites knee cave on first heavy sets. One-dimensional approach: Hip abduction exercises alone may not transfer to the squat. Combine isolation work with squat-pattern practice. Stance Adjustments A slightly wider stance may reduce knee cave by improving hip positioning. Experiment with stance width and toe angle. Some individuals cave less with toes pointed out 20-30 degrees. Find what allows best knee tracking for your anatomy. Foot and Ankle Factors Overpronation at the foot contributes to the chain reaction causing knee cave. Adequate ankle dorsiflexion allows the knee to track forward over the toe. Address foot and ankle issues alongside hip strengthening for complete correction. Warm-Up Protocol Before squatting, perform hip circles, clamshells or side-lying hip abduction, and bodyweight squats with conscious knee tracking. Warm-up activates the stabilizers and primes the motor pattern. Never jump straight into heavy squats without preparation. Progress Expectations Hip strength improvements take 4-6 weeks of consistent training. Motor pattern changes happen faster with focused practice. Video your squats regularly to track knee tracking. Progress shows as knees maintaining position under progressively heavier loads. Start your 14-day free trial and fix knee cave with simplmobility.