A double osteotomy is a surgical procedure in which a surgeon makes controlled cuts in two separate locations on a bone, or in two different bones within the same joint, to correct alignment. The most common version involves the knee, where both the shinbone (tibia) and thighbone (femur) are reshaped to redistribute weight across the joint. The goal is to relieve pain, restore more natural alignment, and delay or avoid joint replacement surgery.
How a Double Osteotomy Works
An osteotomy, in general terms, is a planned surgical cut through bone. A single osteotomy reshapes one bone to correct a deformity. A double osteotomy does the same thing at two sites, either on the same bone or on two bones that meet at a joint. The surgeon removes or adds a wedge of bone at each site, then secures everything with metal plates and screws while it heals.
The core principle is load shifting. In a healthy knee, for example, your body weight passes evenly through the joint. When alignment drifts, one side of the joint bears too much force, grinding down the cartilage and accelerating arthritis. A double osteotomy redistributes that load to the healthier side of the joint by changing the angles of the bones above and below it.
When It’s Used for Knee Arthritis
The most well-studied application is the double level osteotomy (DLO) for severe knee malalignment, particularly a “bowlegged” pattern called varus deformity. In these cases, the inner compartment of the knee wears down while the outer side remains relatively intact. The procedure combines a high tibial osteotomy (reshaping the top of the shinbone) with a distal femoral osteotomy (reshaping the bottom of the thighbone).
A single osteotomy on just the tibia can handle mild to moderate misalignment. But when the deformity is severe and involves both bones, correcting everything through one bone creates its own problems. Overcorrecting the tibia alone tilts the joint line to an unnatural angle, which can cause new pain and instability. A double level osteotomy avoids this by splitting the correction between both bones, keeping the joint line close to horizontal.
Surgeons typically consider a double level approach when preoperative measurements show that both the tibia and femur contribute to the deformity. Specifically, if correcting the tibia alone would push the angle at the top of the shinbone beyond about 95 degrees (normal is around 87 degrees), or if the femur itself has a varus angle greater than 90 degrees, a two-level correction produces more physiologic results. Research comparing the two approaches found that for combined tibial and femoral varus deformity, a double level osteotomy produced more natural joint line orientation along with slightly better patient satisfaction scores.
Double Osteotomy for Bunions
The term also applies to foot surgery. For moderate to severe bunions (hallux valgus), a double first metatarsal osteotomy involves two cuts on the long bone behind the big toe: one near the base and one near the head. Each cut addresses a different component of the deformity. The base cut corrects the overall angle of the metatarsal, while the distal cut fine-tunes the position of the joint surface. An additional small cut on the big toe bone itself (called an Akin osteotomy) is often added. This combination provides more powerful correction than a single cut alone, which matters when the bunion is severe enough that one adjustment point isn’t sufficient.
Double Pelvic Osteotomy for Hip Dysplasia
In veterinary medicine, a double pelvic osteotomy (DPO) is a well-established procedure for young dogs with hip dysplasia. It involves cutting the pelvis at two points, the ilium and pubis, then rotating the hip socket to better cover the ball of the femur. This is a less invasive alternative to the older triple pelvic osteotomy, which cuts in three places. Studies in dogs found that DPO restored normal joint coverage (improving contact from about 50% to 72%) while maintaining pelvic geometry without narrowing the pelvic canal, a common drawback of the triple approach.
How Surgeons Plan the Procedure
Preoperative planning for a double osteotomy, particularly around the knee, relies heavily on imaging. The gold standard is an extremity alignment study: a single standing X-ray that captures the hip, knee, and ankle on the same image. This allows the surgeon to draw the mechanical axis of the leg and measure several critical angles. Three matter most: the angle at the top of the tibia (normally 85 to 90 degrees), the angle at the bottom of the femur (also normally 85 to 90 degrees), and the convergence angle of the joint line (normally 0 to 2 degrees).
When these measurements fall outside normal ranges at both the tibia and femur, a double osteotomy is planned. Digital planning software lets the surgeon simulate how much bone to remove or add at each level before entering the operating room. CT scans add precision by mapping alignment in the rotational plane, which standard X-rays can miss. In published case examples, surgeons have used this approach to plan corrections for varus deformities as large as 15 degrees.
Recovery and Weight Bearing
Recovery from a double level knee osteotomy follows a structured progression. In some rehabilitation protocols, gait training begins as early as three days after surgery using parallel bars. Patients start at roughly half their body weight on the operated leg and gradually increase to about two-thirds over the following weeks.
A Japanese rehabilitation study found that patients completed a parallel bar walking protocol in an average of about 20 days and achieved independent walking in roughly 27 days, or just under a month. Patients who did not experience a fracture around the femoral osteotomy site during rehab consistently reached independent walking within that timeframe. Full recovery, meaning return to normal daily activities and exercise, takes considerably longer as the bone continues to heal and remodel over several months.
Outcomes and Satisfaction
Patient satisfaction rates for knee osteotomy are high. In a study of 123 patients followed for an average of about four and a half years, nearly 89% reported being satisfied overall. When broken down by category, satisfaction was even higher for specific outcomes: 94% were satisfied with the surgery itself, 90% with pain relief, 94% with knee mobility, and 97% with both daily function and leg alignment. All patient-reported outcome scores improved significantly after surgery.
The strongest predictor of satisfaction was whether the patient’s expectations were met before surgery, with an odds ratio of 17.4, meaning patients whose expectations aligned with realistic outcomes were dramatically more likely to be satisfied. Better postoperative pain and function scores also predicted higher satisfaction. Among the small group who were unsatisfied, follow-up periods tended to be longer, suggesting that results may gradually decline over time as the joint continues to age.
Risks and Complications
As with any bone surgery, complications can occur. Osteotomy studies report overall complication rates around 19 to 20%. The most common issues include delayed healing, infection, and overcorrection or undercorrection of the alignment. In the satisfaction study mentioned above, five patients required additional surgery: three for delayed infections, one for overcorrection, and one for a fracture at the osteotomy site that occurred later.
The metal plates and screws used to stabilize the bone during healing are typically left in place permanently unless they cause skin irritation or discomfort, in which case they can be removed in a minor follow-up procedure. Hardware removal rates are low, reported at under 7% in comparative studies. Non-union, where the bone fails to heal across the cut, is a theoretical risk but appears uncommon. In one study of 190 osteotomies, all cases achieved radiographic union regardless of the fixation method used.