Knock knees can often be corrected, but the right approach depends entirely on your age and what’s causing the misalignment. In children, knock knees are almost always a normal phase of development that resolves on its own by age 7. In adults, correction typically requires targeted exercise to improve the mechanics around the knee, and in more severe cases, surgery to physically realign the bones.
Why Knock Knees Happen
Between the ages of 3 and 5, most children develop some degree of inward knee angling. This is a predictable part of how legs grow and straighten, and it usually corrects itself naturally by age 7. A gap between the ankles of up to 5 centimeters is considered normal during this window. If the gap exceeds 8 centimeters at any age, that’s outside the normal range and worth investigating.
When knock knees persist past age 7 in children, or develop for the first time in adolescence or adulthood, something else is usually driving it. The most common contributors include vitamin D deficiency (rickets), obesity, prior knee injury or infection, and inherited skeletal conditions. Excess body weight is particularly problematic in younger people: increased load on the outer growth plate of the thigh bone can slow growth on that side, gradually worsening the inward angle over time.
Knock knees that affect only one leg are more likely to have a specific structural cause, such as a prior fracture near the growth plate or a bone growth abnormality, compared to symmetric knock knees on both sides.
Signs That Need Medical Evaluation
Not every case of knock knees requires treatment, but certain patterns signal that the alignment won’t self-correct. Red flags include knock knees that haven’t improved by age 7 or 8, a noticeably asymmetric angle between the two legs, knee pain during activity, walking with the feet turned outward, or a kneecap that seems to shift toward the outside of the knee. Any of these warrants a full-length standing X-ray from the hips to the ankles to map the exact angle of misalignment.
The long-term stakes of leaving significant knock knees untreated are real. Misaligned knees concentrate force unevenly across the joint. Research on osteoarthritis patients found that 52% had knock knee alignment, with a particularly strong association in people aged 40 to 60. The connection between the deformity and joint degeneration was statistically significant across multiple studies, especially at more advanced stages of arthritis.
Exercises That Improve Knee Alignment
For mild knock knees, especially in adults, strengthening the muscles that control hip and knee position can meaningfully improve how the knee tracks during movement. The key muscle groups are the gluteus medius (the muscle on the outer side of your hip), the gluteus maximus, the hamstrings, and the outer thigh muscles. These muscles work together to prevent your knee from collapsing inward when you walk, run, squat, or go down stairs.
Exercises that target these areas include:
- Side-lying leg raises: Strengthen the outer hip muscles that pull the knee into better alignment
- Clamshells: Isolate the gluteus medius with the knees bent and feet together
- Single-leg squats or step-downs: Train the leg to resist collapsing inward under load
- Resistance band walks: Loop a band around the knees or ankles and walk sideways to activate the hip abductors
- Bridges with a focus on knee position: Strengthen the glutes while keeping the knees aligned over the feet
Research on corrective exercise programs found that resistance training with elastic bands was particularly effective at reducing the degree of inward knee angle. The results are best when exercises are done consistently over weeks to months. Exercise alone won’t physically reshape bone, but it can change how forces travel through the knee joint by improving muscular control, which reduces pain and slows further wear on the cartilage.
Do Insoles or Knee Braces Help?
Orthotic insoles and knee braces fall into the category of supportive tools rather than structural fixes. They won’t permanently change bone alignment, but they can make a meaningful difference in how the knee functions day to day. Insoles that support the arch of the foot have been shown to improve knee joint support, particularly during activities like going down stairs where the knee is under high stress. Combining arch-supporting insoles with balance and strengthening exercises appears to reduce the degree of inward knee collapse during movement.
Knee braces work differently. Adjustable braces can immediately reduce injury risk in people with knock knees by changing how forces are distributed across the joint. They also increase activation of key stabilizing muscles in the back of the thigh. That said, one study found that poorly fitted braces could actually increase applied forces on the joint, so proper fitting matters. Kinesiology tape applied around the knee has also shown modest benefits when combined with exercise.
The bottom line on these tools: they’re useful add-ons to an exercise program, not standalone solutions.
Guided Growth Surgery for Children
When a child’s knock knees are clearly pathologic and unlikely to self-correct, surgeons can take advantage of the fact that bones are still growing. A procedure called guided growth involves placing a small plate on the inner side of the growth plate near the knee. This temporarily slows growth on that side while the outer side continues growing, gradually straightening the leg over months.
The procedure is minimally invasive, and results are excellent. In one study tracking outcomes to skeletal maturity, angular correction was achieved in 30 out of 31 patients. The plate is removed once alignment is corrected, and growth continues normally. Timing matters: the child needs to have enough growth remaining for the technique to work, so it’s typically done well before the growth plates close in the mid-to-late teenage years.
Osteotomy Surgery for Adults
Adults whose growth plates have already closed don’t have the guided growth option. For significant knock knee deformity that causes pain, limits activity, or puts the joint at risk for early arthritis, the surgical solution is an osteotomy. This involves carefully cutting and repositioning the bone to correct the angle.
When the misalignment exceeds about 12 degrees, both the thigh bone and the shin bone may need to be corrected in the same procedure. For smaller deformities, only one bone is addressed. After surgery, patients typically stay in the hospital for about two nights. Rehabilitation starts immediately with partial weight bearing and range-of-motion exercises, then continues for several weeks as the bone heals. Full recovery takes months, but the goal is a permanently corrected alignment that protects the knee joint for the long term.
Surgery is generally recommended when the misalignment is causing physical symptoms, emotional distress, or creating a clear trajectory toward joint damage. It’s not the first option for mild cases.
The Role of Weight Management
If you’re carrying extra weight and have knock knees, weight loss is one of the most impactful things you can do. Every pound of body weight translates to multiple pounds of force through the knee joint, and that force is distributed unevenly when alignment is off. In children and adolescents, obesity can actively worsen knock knees by compressing the outer growth plate of the thigh bone and slowing growth on that side. In adults, excess weight accelerates cartilage wear in the already overloaded compartment of the knee.
Weight management alone won’t straighten bones that are already misaligned, but it reduces the mechanical stress that makes knock knees symptomatic and progressive. Combined with the hip and thigh strengthening exercises described above, reaching a healthier weight often produces the most noticeable improvement in knee pain and function without any surgical intervention.