High tibial osteotomy (HTO) changes the alignment of the upper tibia so that weight shifts away from an overloaded part of the knee. It is a joint-preserving operation, not a pain procedure and not a knee replacement.
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What problem is HTO trying to solve?
HTO is most often considered when arthritis is concentrated in one compartment—commonly the medial side—and the leg’s alignment contributes to excess load in that compartment. The surgeon creates an opening or closing wedge in the tibia and fixes the corrected bone while it heals.
The operation can reduce pain and preserve the natural joint in well-selected patients, but it involves a bone cut, healing time, fixation hardware, and a more substantial recovery than an injection or nerve procedure.
Who may be considered?
Selection varies, but the discussion commonly includes:
- Arthritis mainly confined to one compartment.
- Varus or another correctable alignment pattern.
- Preserved motion and acceptable ligament stability.
- Activity goals that favor preserving the natural knee.
- Age, health, bone quality, body size, smoking status, and ability to follow weight-bearing and rehabilitation instructions.
Advanced arthritis across several compartments, major stiffness, inflammatory disease, or other structural problems may make a replacement procedure more appropriate. No age cutoff or X-ray grade works for every patient.
What does the evidence support?
The American Academy of Orthopaedic Surgeons states that HTO may be considered to improve pain and function in properly indicated patients with unicompartmental knee osteoarthritis. AAOS grades the recommendation as limited, reflecting the quality and consistency of the available comparative evidence—not a conclusion that the operation is experimental.
Long-term series show that HTO can delay conversion to arthroplasty in selected patients, but survivorship varies with selection, alignment correction, technique, and the definition of failure.
HTO compared with nearby options
| Option | Main idea | Recovery burden | Best fit question |
|---|---|---|---|
| Unloader brace | External trial of compartment unloading | Low | Does unloading reduce symptoms enough to be useful? |
| MISHA | Implant shares medial load without an osteotomy | Moderate surgical burden | Does the narrow FDA indication fit, and are device tradeoffs acceptable? |
| HTO | Bone realignment shifts the mechanical axis | Higher; bone healing required | Is malalignment a major driver in an active patient seeking joint preservation? |
| Partial knee replacement | Replaces one damaged compartment | Arthroplasty recovery | Is the disease isolated and the rest of the knee suitable for partial replacement? |
| Total knee replacement | Replaces the main joint surfaces | Arthroplasty recovery | Is disease advanced or multicompartmental enough that preservation is unlikely to meet the goal? |
Potential advantages
- Preserves the native joint surfaces.
- Addresses alignment rather than only masking pain.
- Can be combined with selected cartilage, meniscus, or ligament procedures.
- May support higher-impact activity better than arthroplasty for some patients.
Tradeoffs and risks
- Bone healing takes time and may be incomplete or delayed.
- Hardware may be prominent or later removed.
- Risks include infection, blood clot, nerve or vessel injury, over- or under-correction, stiffness, fracture, and later conversion to knee replacement.
- A future knee replacement can be technically more complex after osteotomy.
- Recovery is generally longer than after an outpatient pain procedure or brace trial.
Questions to ask an HTO surgeon
- Is the main problem truly compartment overload from alignment?
- What full-length standing imaging is needed for planning?
- Why HTO instead of MISHA or partial knee replacement?
- How much correction is planned, and how is it measured?
- What are the weight-bearing, bone-healing, and return-to-work expectations?
- How often do your patients need hardware removal or later knee replacement?
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