Who usually benefits from HTO

HTO is usually a realistic option when the problem is one overloaded part of the knee, not arthritis everywhere. The classic pattern is medial compartment wear with a correctable alignment problem, where changing limb alignment can shift load away from the damaged side. Published guidance and long-term follow-up most strongly support it in younger, active, relatively non-obese patients with unicompartmental osteoarthritis. In a 20-year outcomes study, better survivorship was linked with age under 55, BMI under 30, and less severe symptoms. That is why HTO is generally framed as a way to delay knee replacement, rather than as a like-for-like substitute for partial or total arthroplasty.

The picture is different when wear is diffuse or the knee has problems that alignment alone is unlikely to solve. Even a 2024 systematic review reporting 74.6% average survivorship at 10 years in advanced medial osteoarthritis still relates to selected medial disease, not end-stage arthritis affecting the whole joint. Where damage is widespread, joint preservation may be less durable, and knee replacement may be the more realistic pathway.

What recovery often looks like

Recovery after HTO is usually measured in months, not days. The early phase typically focuses on settling swelling, managing pain, protecting the osteotomy, restoring knee movement, and building confidence with crutches before day-to-day activity increases.

The exact pace is not fixed. Return to office work, driving, sport or heavier manual work can vary between patients and between surgeon-led protocols. Recovery may also be slower when HTO is combined with cartilage or meniscal procedures at the same sitting.

When you can put weight on the leg

The point at which full body weight is allowed is one of the most surgeon-specific parts of HTO aftercare. In practice, the decision often depends on the osteotomy type, how stable the fixation is, whether follow-up x-rays show satisfactory bone healing, and whether a cartilage or meniscal procedure was done at the same operation.

Because rehabilitation plans vary, the most useful answer usually comes from the treating team’s written protocol rather than from a generic online timetable.

What affects success and what can go wrong

Long-term benefit depends as much on patient fit as on the operation itself. In a 20-year outcomes study, overall HTO survivorship was 44%, but it was markedly better in more favourable candidates: 100% at 5 years and 62% at 20 years. Better durability was linked with age under 55, BMI under 30, and less severe symptomatic disability. That is why selection matters so much: the further the knee has moved from a single overloaded compartment towards more established arthritis, the less predictable the joint-preserving gain may be.

Risk is usually low in larger pooled data, but it is not trivial. A systematic review of 71 studies covering 7,836 patients reported 5.5% intraoperative and 6.9% postoperative complication rates. The main problems were nonunion (1.9%), loss of correction (1.2%), implant failure (1.0%), superficial infection (2.2%) and neurovascular injury (1.1%).

In practice, discussions before surgery often turn on four concrete points: age, weight, the degree of arthritis, and the activity goals the knee needs to meet after recovery.

How HTO fits into joint preservation

In the treatment pathway, HTO usually sits after symptom-led care such as physiotherapy and activity modification, but before knee replacement. Its job is mechanical: it shifts load away from the damaged side of the knee, rather than regrowing cartilage by itself. That makes it most useful when the problem is still confined to one compartment. A 2024 systematic review reported average HTO survivorship of 74.6% at 10 years in radiologically advanced medial osteoarthritis, which suggests that joint preservation may still be realistic in some carefully selected knees rather than moving straight to arthroplasty.

HTO may also form part of a broader joint-preservation strategy when surgeons are trying to improve the load environment in the knee. The limit is when wear is no longer localised: if arthritis is widespread, the preservation window may be closing, and replacement is more often the more appropriate pathway.

Questions to ask before choosing a specialist

A strong first consultation is less about generic 'recovery timelines' and more about whether the specialist can explain a knee-specific plan. Useful questions include:

• 'Am I a good candidate for HTO, or is the arthritis too widespread for joint preservation to be realistic?'
• 'What alignment problem are you correcting — varus overload, joint-line imbalance, or something else?'
• 'Which osteotomy technique do you use, and how does that affect weight bearing, follow-up x-rays and progression?'
• 'What would make you combine HTO with cartilage or meniscal work?'
• 'What recovery milestones matter most for physiotherapy, driving and time away from work, and what is the backup plan if preservation is unlikely to help?'

Because protocols can differ between techniques, fixation methods and surgeon practice, experience with that specific technique matters. With those answers in hand, Search MSK lists specialists across the UK who offer knee preservation surgery and HTO assessment, with filters by region and specialty.