science

High tibial osteotomy

High tibial osteotomy is a science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand High tibial osteotomy rather than just read about it. In short: High tibial osteotomy is an orthopaedic surgical procedure which aims to correct a varus deformation with compartmental osteoarthritis. Since the inception of the procedure, advancements to technique, fixation devices, and a better understanding of patient selection has allowed HTO to become more popular in younger, more active patients hoping to combat arthritis.

Key takeaways

High tibial osteotomy belongs to science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect High tibial osteotomy to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of High tibial osteotomy from memory before moving on to harder problems.

Reference excerpt

High tibial osteotomy is an orthopaedic surgical procedure which aims to correct a varus deformation with compartmental osteoarthritis. Since the inception of the procedure, advancements to technique, fixation devices, and a better understanding of patient selection has allowed HTO to become more popular in younger, more active patients hoping to combat arthritis. The idea behind the procedure is to realign the weight-bearing line of the knee. By realigning the knee, the force produced from weight-bearing is shifted from the arthritic, medial compartment to the healthy, lateral compartment. This decrease in force or load in the diseased part of the knee joint decreases knee pain and can delay the development or progression of osteoarthritis in the medial compartment.

Patient selection The accepted protocol used for patient selection was developed in 2004 by the International Society of Arthroscopy, Knee Surgery, and Orthopedic Sports Medicine (ISAKOS). According to this protocol, an ideal patient is:

Moderately active Between 40 and 60 years old Experiencing isolated medial joint line tenderness BMI <30 Malalignment <15° Tibia bone varus angle >5° Full range of motion in the knee Near-normal lateral and patellofemoral compartments without ligamentous instability A non-smoker Contraindications specified by ISAKOS are:

Patients older than 65 Severe osteoarthritis of the medial compartment (Ahlback grade III or higher) Tricompartmental osteoarthritis Patellofemoral osteoarthritis Range of motion in the knee <120° Flexion contracture >5° Diagnosed inflammatory arthritis A large area of exposed bone on the tibial or femoral articular surface (> 15x15 mm) Heavy smokers

Surgical technique The general surgical technique includes either performing HTO alone or performing HTO in combination with ligament reconstruction. When deciding which treatment avenue to take, one must consider patient demographics, their predominant symptoms, and which ligaments, if any are involved. When ligaments are involved, but the ACL deficiency is chronic and pain is due to arthritis and malalignment, HTO alone should be sufficient. However, if instability is the predominant symptom, in for example an acute ACL deficiency, HTO in combination with ACL reconstruction may be performed to protect the ACL graft that was constructed. The two most common surgical techniques used in HTO are lateral close wedge osteotomy and medial open wedge osteotomy.

Lateral close wedge osteotomy Starting at the anterolateral aspect about 1 cm below the joint line of the knee, an L-shaped cut is made to the lateral edge of the tibial tubercle and anterior tibial crest. To expose the bone, the fascia of the anterior compartment is cut near the anterior tibial crest and the anterior tibialis is elevated. Osteotomy starts 15 mm below the joint line, just above the tibial tubercle, and is directed parallel to the joint line, medially. Some of the advantages of the lateral close wedge method are faster healing with less morbidity, greater potential for healing, and no need for bone grafting, unlike the medial open wedge method.

Medial open wedge osteotomy The initial cut is made in between the posteromedial border of the tibia and medial aspect of the tibial tubercle. Medial collateral ligament (MCL) is exposed by cutting the sartorius fascia and pulling it medially. MCL is then removed from its insertion medially. Two K-wires are placed towards the lateral cortex, about 4 cm below the joint line. The osteotomy is done below the K-wires and parallel to the joint line. The advantages of the medial open wedge method include less risk of peroneal nerve injury compared to the lateral close wedge method, no limb shortening, no bone loss, and the use of a single cut with no need to detach muscles.

Methods of fixation Two main types of fixation plates are used: spacer plates and plate fixators. Spacer plates are lower profile implants that require a smaller incision. The disadvantage of using a spacer plate is the decreased rigidity associated with increased rates of delayed union or nonunion. Because of this, spacer plates require a longer period of staying off the leg that was operated on. Plate fixators give a stronger fixation, allowing for earlier weight-bearing and initiation of therapy. A couple of studies attempted to compare these two methods but found no differences in reliability.

Filling the bone gap After part of the bone is removed, there is a space that may need to be filled. Some prefer using a graft or bone substitute, which will hopefully increase stability and decrease healing time. Bone can also be taken from the hip of the patient to use as a graft. This has a lower complication rate so is considered in someone who is at risk of the bone not healing, like a smoker or obese patient.

Complications The most common complications are the same as those occurring for any orthopedic procedure performed on a lower limb. These are:

Deep venous thrombosis Superficial wound infection Hematoma The complications specific to the HTO are rare and include the failure of the bone to heal, common peroneal nerve palsy, decreased ROM, a low lying knee-cap, and a fracture inside the knee joint.

References

External links Wright, J. M.; Crockett, H. C.; Slawski, D. P.; Madsen, M. W.; Windsor, R. E. (2005). "High tibial osteotomy". The Journal of the American Academy of Orthopaedic Surgeons. 13 (4): 279–289. doi:10.5435/00124635-200507000-00007. PMID 16112984. S2CID 23814779. Coventry, M. B. (1989). "Osteotomy of the upper portion of the tibia for degenerative arthritis of the knee. A preliminary report. 1965". Clinical Orthopaedics and Related Research (248): 4–8. PMID 2680204. Koshino, T.; Morii, T.; Wada, J.; Saito, H.; Ozawa, N.; Noyori, K. (1989). "High tibial osteotomy with fixation by a blade plate for medial compartment osteoarthritis of the knee". The Orthopedic Clinics of North America. 20 (2): 227–243. PMID 2922190.

Worked examples

Example 1 — a first encounter with High tibial osteotomy

Start with the simplest possible case. Write down what High tibial osteotomy claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to High tibial osteotomy before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about High tibial osteotomy ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of High tibial osteotomy

In research: High tibial osteotomy appears in science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses High tibial osteotomy in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: High tibial osteotomy is common in secondary-school and first-year university syllabi. It links to neighbouring topics Orthopedic surgical procedures, so understanding it makes those chapters shorter.
In everyday life: Look for High tibial osteotomy outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study High tibial osteotomy in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what High tibial osteotomy means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain High tibial osteotomy out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is High tibial osteotomy in simple terms?

Why does High tibial osteotomy matter?

Because it connects several science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study High tibial osteotomy?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on High tibial osteotomy.