Most knock knees in children correct themselves naturally by age 7 and need no treatment at all. In adults and older children whose knees angle inward beyond normal range, the options depend on severity: strengthening exercises and orthotics can improve mild cases, while significant misalignment may require surgery. The key is figuring out which category you or your child falls into.
When Knock Knees Are Normal
Nearly all children develop some degree of inward knee angle between ages 2 and 5. This is a predictable phase of leg development. At 3 to 4 years old, anywhere from a slight outward bow to 20 degrees of inward angulation is considered normal. The angle gradually decreases on its own, settling into the adult range of 5 to 7 degrees by age 7.
Most children under 6 who are evaluated for knock knees actually have this normal, self-correcting pattern. No braces, exercises, or special shoes are needed. It simply resolves with growth. The concern starts when the gap between the ankles (measured while the knees are touching) exceeds 8 centimeters, when the angle is getting worse instead of better past age 6 or 7, or when only one leg is affected.
Why Some Cases Don’t Self-Correct
Knock knees that persist past age 7 or develop during adolescence or adulthood typically have an underlying cause. These include vitamin D or calcium deficiency (rickets), obesity placing extra load on the growth plates, previous injuries to the knee or shinbone, and certain genetic bone conditions. In adults, the alignment can also worsen gradually from flat feet, weak hip muscles, or years of compensating for poor mechanics.
Understanding the cause matters because it determines the treatment. A child with rickets needs nutritional correction first. An adult whose knees angle inward partly due to weak hips will benefit from targeted exercise. Someone with a significant structural deformity in the bone itself will likely need surgical correction.
Exercises That Improve Mild Knock Knees
The muscles on the outside of your hip, particularly the gluteus medius, play a major role in controlling how your knee tracks when you stand, walk, and squat. When these muscles are weak, the knee collapses inward during movement, worsening the knock-knee position. Strengthening them won’t reshape bone, but it can meaningfully reduce how far your knees drift inward during daily life and exercise, which also reduces joint stress over time.
For people just starting out or dealing with pain, these exercises activate the right muscles without heavy loading:
- Clamshells: Lie on your side with knees bent, feet together, and open your top knee like a clamshell. This targets the hip rotators with minimal joint stress.
- Side-lying hip abduction: Lie on your side with your top leg straight and lift it toward the ceiling, keeping your hips stacked.
- Single-leg bridge: Lie on your back, plant one foot, and drive your hips upward. This builds both hip and core stability.
Once those feel easy, progress to standing and functional exercises that train your muscles to control knee position in real-world movements:
- Lateral band walks: Place a resistance band around your ankles or just above your knees, then step sideways while keeping tension on the band.
- Unilateral mini-squats: Stand on one leg and perform a shallow squat, focusing on keeping your knee tracking over your second toe rather than caving inward.
- Walking lunges: Holding a weight in the opposite hand from the forward leg increases demand on the hip stabilizers.
Consistency matters more than intensity. Performing these exercises three to four times per week over several months produces the best results. If your knee visibly collapses inward when you squat or go down stairs, that’s a sign these muscles need attention regardless of whether you pursue other treatments.
Orthotics and Heel Wedges
Medial heel wedges are silicone inserts placed inside your shoe with the raised edge along the inner side of your foot. They gently tilt your ankle outward, which counteracts the inward rolling (overpronation) that often accompanies knock knees. This doesn’t correct the bone alignment itself, but it can reduce knee pain and slow the progression of joint wear by redistributing force more evenly across the knee.
These inserts are most useful for adults with mild to moderate knock knees, especially those who also have flat feet. They’re inexpensive, available in universal sizes, and can be worn in most shoes. For children, orthotics are rarely recommended unless there’s a specific foot deformity contributing to the problem, since the alignment is likely to self-correct.
Guided Growth Surgery for Children
When a child’s knock knees are clearly pathological, not improving, and the child is still growing, surgeons can use a technique called guided growth. A small plate is placed 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. Once the alignment is corrected, the plate is removed and growth returns to normal.
The procedure is minimally invasive and has very high success rates. In one study, angular correction was achieved in all patients, with 30 out of 31 reaching full correction. The key requirement is that the child still has active growth plates, which is why timing matters. If the window of remaining growth is too short, the plate won’t have enough time to produce meaningful correction.
Osteotomy Surgery for Adults
Adults whose growth plates have closed can’t benefit from guided growth. Instead, corrective surgery involves a distal femoral osteotomy: the surgeon cuts a wedge from the thighbone just above the knee and realigns it, then fixes the bone in its new position with a plate and screws. This is typically recommended when the inward angle exceeds 12 to 15 degrees or when the joint line tilts more than 10 degrees from horizontal.
Candidates need a stable knee joint with at least 90 degrees of bending range and no significant inflammatory arthritis. The surgery is not a quick fix. You’ll be non-weight-bearing for the first four weeks, then gradually progress from toe-touch walking to partial weight-bearing over the next several weeks. Most people stop using crutches around 6 to 7 weeks. Full return to high-impact activities like running or sports typically falls in the 5- to 6-month range, though the timeline varies based on healing and individual factors.
What Happens If You Do Nothing
Mild knock knees that don’t cause pain or functional problems can be left alone. But significant misalignment that goes untreated carries real long-term consequences. Research from the Multicenter Osteoarthritis Study found that people with valgus alignment greater than 3 degrees had roughly 2.5 times the risk of developing knee osteoarthritis compared to those with normal alignment. The same study found a nearly sixfold increase in cartilage damage visible on MRI in misaligned knees that hadn’t yet developed arthritis.
The damage pathway is straightforward: when your knees angle inward, the outer (lateral) compartment of the knee bears disproportionate force. Over years, this wears down the cartilage and damages the lateral meniscus. Once that protective cushioning is compromised, the joint deteriorates faster. This is why even adults with moderate knock knees who aren’t ready for surgery benefit from strengthening exercises and orthotics. Reducing the inward pull on the knee, even modestly, can slow this process considerably.