What is High Tibial Osteotomy?

What Is High Tibial Osteotomy?

The knee is divided into three compartments: the medial compartment on the inner side, the lateral compartment on the outer side and the patellofemoral compartment between the kneecap and thigh bone. If one side is taking more load because the leg is bowed or otherwise misaligned, that compartment can wear faster.

A high tibial osteotomy changes that load. The surgeon makes a planned cut in the upper tibia and adjusts the bone so the weight-bearing line moves towards healthier cartilage. It does not remove arthritis, and it is not a smaller version of knee replacement. The aim is different: to protect the worn side by redistributing stress across the joint.

Who May Be a Good Candidate for High Tibial Osteotomy?

HTO is most often discussed with younger or physically active adults who have painful arthritis limited mainly to one tibiofemoral compartment, usually the medial side, together with correctable varus alignment. The American Academy of Orthopaedic Surgeons notes that tibial osteotomy may be considered to improve pain and function in appropriately selected people with unicompartmental knee osteoarthritis.

Selection goes beyond age. Standing full-length X-rays, the exact site of pain, cartilage loss, ligament stability, range of movement, work demands, sport and general health all matter. Someone who still has good movement and isolated medial disease may be a stronger candidate than a person whose arthritis has spread across the joint.

Who May Not Be Suitable?

HTO may not be the best choice when arthritis is advanced in several compartments, the knee is very stiff or the deformity cannot be corrected reliably. Severe ligament deficiency and inflammatory arthritis can also change the treatment plan. Smoking, poor bone health, significant obesity and medical conditions that interfere with bone healing deserve careful discussion before surgery.

How Is HTO Planned?

Much of the success of HTO is decided before the operation begins. Full-length weight-bearing X-rays help show where the mechanical axis runs from the hip to the ankle and how far it needs to move. The correction has to be enough to unload the damaged side without pushing too much force onto cartilage that is still healthy.

Miniaci Method High Tibial Osteotomy Planning

The miniaci method high tibial osteotomy planning technique uses long-leg radiographs to calculate the correction angle and the wedge required to achieve it. Digital planning can make those measurements more reproducible. Even so, the numbers are only part of the plan; the surgeon must also understand where the deformity starts and how the correction will affect the joint line.

Fujisawa Point High Tibial Osteotomy Planning

The fujisawa point high tibial osteotomy concept is a traditional reference used in valgus-producing HTO. It places the planned weight-bearing line at roughly 62% of the tibial plateau width from the medial edge. That figure should not be treated as a fixed target for every knee. Modern planning is increasingly individualised around cartilage condition, alignment and patient-specific anatomy.

Open-Wedge vs Closing-Wedge High Tibial Osteotomy

In a medial opening-wedge HTO, the tibia is cut from the inner side and gradually opened until the planned correction is reached. A plate and screws hold the new position while the bone heals, and bone graft or a substitute may be used in selected cases.

A lateral closing-wedge HTO works differently. A wedge of bone is removed from the outer side and the remaining bone surfaces are brought together. Both approaches can correct alignment, but they affect bone stock, tibial slope, surgical exposure and any later knee replacement differently.

What Happens During High Tibial Osteotomy Surgery?

High tibial osteotomy surgery is performed under anaesthesia. After confirming the plan, the surgeon creates the tibial cut under imaging guidance, protects the remaining bony hinge where appropriate and brings the leg into the intended alignment. The correction is checked before the bone is fixed with implants.

Sometimes arthroscopy is added to look directly at cartilage, menisci or other structures inside the knee. It is not automatically necessary. Whether it adds value depends on what else is happening in the joint.

Recovery After High Tibial Osteotomy

HTO recovery takes time because a bone has been cut and must heal in its new position. Weight-bearing is therefore progressed according to the osteotomy type, fixation, bone quality and the surgeon’s protocol. Some patients use crutches and protect the operated leg for several weeks before gradually increasing load.

Physiotherapy usually starts with swelling control, safe movement and range of motion, then builds towards strength, balance and a more normal walking pattern. Returning to a desk job is generally easier than returning to heavy physical work. Running, jumping and pivoting sports need more time because bone healing and muscle control both matter.

What Research Shows About Outcomes

Research supports HTO as a joint-preserving option for well-selected patients, but results depend heavily on indication and technique. A 2024 systematic review reported good clinical outcomes and favourable survivorship in selected people with advanced medial-compartment osteoarthritis. More recent comparative evidence, including a 2026 meta-analysis of HTO versus unicompartmental knee arthroplasty, shows that the two operations involve different trade-offs rather than one being the automatic “better” choice.

High Tibial Osteotomy Complications

High tibial osteotomy complications can include infection, blood clots, delayed union or non-union, fracture around the osteotomy, loss of correction, irritation from plates or screws, nerve or blood-vessel injury and progression of arthritis. A systematic review of complications found that serious problems were uncommon overall, but they remain important to discuss before surgery.

Alignment itself can also create problems. Too little correction may leave the arthritic side overloaded, while too much can increase stress on the opposite compartment. That is why planning is not simply about making the leg look straighter.

When Should You Seek Urgent Medical Advice?

Increasing wound redness or drainage, persistent fever, worsening calf swelling, chest pain, breathlessness, sudden severe pain or new numbness should be assessed promptly. These symptoms do not confirm a complication, but they are not symptoms to watch at home without advice.

Are There Alternatives to HTO?

Yes. Surgery is not inevitable. Depending on the pattern and severity of arthritis, treatment can include knee rehabilitation, strength work, activity modification, weight management, medicines, injections or bracing.

The surgical alternatives also differ according to the knee. Partial knee replacement may suit some people with isolated compartment disease, while total knee replacement is more often considered when arthritis is widespread. Knee arthroscopy has a limited role in established osteoarthritis, although it may still be useful for selected mechanical problems.

Dr Amyn Rajani’s Research and Why It Matters

Dr Amyn Rajani’s scientific publications include research on osteotomy and alignment correction around the proximal tibia. One of his studies described a postero-central slice osteotomy of the proximal tibia for difficult extension-gap balancing during total knee arthroplasty in varus osteoarthritis.

That study is not a trial of HTO, so it should not be used to claim that HTO is superior or suitable for a particular patient. Its relevance is more specific. It shows research experience with proximal tibial osteotomy, varus deformity and the practical problem of restoring alignment around the knee. Keeping that distinction clear is important because research should add context, not be stretched beyond what it actually studied.

FAQs

What is the purpose of a high tibial osteotomy?

It shifts load away from the arthritic side of the knee by changing tibial alignment. The goal is to reduce symptoms while preserving the natural joint.

How long does HTO recovery take?

Recovery is usually measured in months because the bone itself has to heal. Timing varies with the osteotomy, fixation, health, strength and rehabilitation progress.

When can I walk after HTO?

Walking often starts with crutches or another aid and controlled weight-bearing. Progression depends on stability, healing and the surgeon’s rehabilitation plan.

Can I have a knee replacement after HTO?

Yes. Knee replacement remains possible if arthritis progresses later, although previous osteotomy can make the operation technically more complex.

Is HTO better than partial knee replacement?

Neither is universally better. HTO may suit an active person with correctable malalignment, while partial replacement may fit a different pattern of isolated-compartment arthritis.