Modern Study Review (AI-Generated)
High-Yield Summary
High Tibial Osteotomy (HTO) remains a key joint-preserving surgical option for younger, active patients with unicompartmental medial knee osteoarthritis and varus malalignment. Proper patient selection, precise preoperative planning, and meticulous surgical technique are critical to optimize pain relief, restore mechanical alignment, and delay or prevent the need for total knee arthroplasty (TKA). Advances in fixation devices and imaging guidance have improved outcomes and reduced complications.
Key Diagnostic Findings
| Aspect | Details |
|---|
| Anatomy | Proximal tibia, medial compartment of knee, medial collateral ligament (MCL), fibula |
| Clinical Presentation | Medial knee pain, varus deformity, preserved range of motion, minimal or no lateral compartment disease |
| Preoperative Assessment | Knee range of motion, ligamentous stability (especially MCL laxity), mechanical axis alignment, degree of varus deformity |
| Imaging | Weight-bearing long-leg alignment films, MRI (to assess cartilage and menisci), CT for complex deformities |
| Classification/Planning | Preoperative templating to determine wedge size and location; consideration of posterior tibial slope |
Current Gold Standard Treatment
| Treatment Aspect | Indications & Notes |
|---|
| Non-operative | Initial management includes activity modification, NSAIDs, physical therapy, bracing |
| Operative Indications | Symptomatic medial compartment OA with varus alignment, good knee ROM, minimal lateral compartment disease, and intact MCL stability |
| Surgical Technique | Medial opening wedge or lateral closing wedge osteotomy; medial cortex preserved for stability; correction planned to shift mechanical axis to lateral compartment (typically 62-66% across tibial plateau) |
| Fixation | Modern locking plates (e.g., TomoFix) preferred for stable fixation and early weight-bearing |
| Fibular Management | Fibular osteotomy or proximal fibular head resection if needed; care to avoid peroneal nerve injury |
| Postoperative Care | Early mobilization, protected weight-bearing, physiotherapy focusing on ROM and strengthening |
Modern Complications & Outcomes
| Complication | Notes |
|---|
| Nonunion/Delayed Union | Reduced with stable fixation and proper surgical technique |
| Intra-articular Fracture | Risk if osteotomy too close (<2 cm) to joint line; avoid by careful templating |
| Neurovascular Injury | Peroneal nerve injury during fibular osteotomy; avoid by identifying nerve and safe osteotomy zones |
| Patella Baja (Infera) | More common with osteotomy proximal to tibial tubercle; may complicate future TKA |
| Loss of Correction/Overcorrection | Can lead to valgus deformity if MCL laxity not addressed preoperatively |
| Infection | Low with prophylactic antibiotics and sterile technique |
| Long-term Outcomes | Good pain relief and function in properly selected patients; delays need for TKA by 8-10 years on average |
Classic Clinical Notes
High Tibial Osteotomy – Technique
- Start with the patient selection – is this patient a good candidate?
- Make sure you note range of motion and stability of the knee – in particular, do they have excessive MCL laxity (greater than just pseudolaxity) so that when you correct them they may just keep going into valgus?
- Preoperatively template the cut – where in relation to the joint line, and how much of a wedge?
- Equipment: radiolucent table, tourniquet, image intensifier, cutting jig, fixation device
- Antibiotics prior to the inflation of tourniquet
- Choice of incisions: transverse at level of fibular head, curvilinear, or straight midline. Might as well go straight midline because it will make your subsequent TKA easier.
- Lift off anterior compartment in sub-periosteal fashion to expose the proximal tibia.
- The first cut is made approximately 2.0 cm distal to the joint line: use pins and a cutting guide
- Mark off your oblique cut according to pre-operative templating: use pins and a cutting guide. Be aware that with this cut you adjust not only the coronal alignment but also the sagittal – don’t forget the normal posterior slope of the tibia!
- Leave the medial cortex intact for stability, but make sure you get fully across on both cuts, particularly the superior cut (if you don’t, you risk fracturing up into the joint!)
- Expose the fibula 160 cm from the tip and make an oblique osteotomy (the two danger zones are from 0-40 mm – motor branch to tibialis anterior, and from 68-153 mm – motor branch to EHL)
- Fix with multiple stepped staples or Weber semitubular tension band plate
- Prophylactically perform anterior fasciotomy.
Technical Notes:
- Doing the osteotomy proximal to the tibial tubercle unfortunately leaves the patellar tendon lax initially – it eventually contracts/scars and leaves you with patella infera which can make your subsequent TKA exposure difficult
- Don’t go any closer than 2 cm to the joint with your superior cut – risk intra-articular fracture when closing the osteotomy if you go close
- The closer to the joint line, the more “truncation” or overlap you get, but the better the healing. Going farther from the joint line minimizes the truncation, but the nonunion rate is much higher.
- There are a number of different described techniques of fixation
- There are a number of different ways to address the fibula – you can also dissect out the nerve, then cut the bone proximally. Disarticulating the tib-fib joint or resecting the fibular head will allow correction of the varus, but may lead to LCL instability.
Last Updated on January 24, 2026 by orthonet
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