High Tibial Osteotomy
High Tibial Osteotomy (HTO) is a surgical procedure that realigns the knee joint by cutting and reshaping the upper part of the tibia (shinbone). The goal is to shift body weight away from the damaged part of the knee to a healthier area, reducing pain and slowing the progression of arthritis.
This procedure is most commonly used to treat unicompartmental knee osteoarthritis, where only one side of the knee joint is affected.
Why Is It Needed?
In many patients, knee arthritis develops unevenly, often affecting the inner (medial) compartment of the knee. This causes a bow-legged (varus) alignment, increasing pressure on the damaged side.
HTO helps by:
- Correcting knee alignment
- Reducing stress on the arthritic compartment
- Relieving pain
- Preserving the natural knee joint
An ideal candidate for High Tibial Osteotomy (HTO) is typically a patient who has knee pain due to early to moderate osteoarthritis that is limited to one side of the knee joint, most commonly the medial (inner) compartment. These individuals often have a bow-legged (varus) knee alignment, which increases stress on the damaged portion of the joint and contributes to pain during walking or physical activity.
2. Closed-Wedge Osteotomy is a surgical technique used in high tibial osteotomy to treat knee osteoarthritis affecting one side of the knee joint, usually the medial compartment. In this procedure, a wedge-shaped piece of bone is removed from the outer (lateral) side of the upper tibia. After removing the bone wedge, the two bone ends are brought together, or “closed,” to correct the knee alignment and reduce stress on the diseased portion of the joint.
The corrected bone is then stabilized using plates and screws to allow proper healing. Closed-wedge osteotomy provides effective realignment of the knee but involves more bone removal and carries a higher risk of injury to surrounding structures compared to the open-wedge technique. Due to these limitations, it is less commonly used today, though it remains an effective option in selected patients.
How Is the Procedure Performed?
- Surgery is done under spinal or general anesthesia: High Tibial Osteotomy is performed under anesthesia so that the patient does not feel pain during the operation. Depending on the patient’s condition and surgeon’s choice, either spinal anesthesia (numbing the lower body) or general anesthesia (patient fully unconscious) is used.
- A precise bone cut is made in the tibia: The surgeon carefully makes a controlled cut in the upper part of the tibia (shin bone). This cut is planned accurately to correct the abnormal alignment of the knee and shift body weight away from the damaged area.
- Knee alignment is corrected: After the bone cut, the tibia is adjusted to change the angle of the knee joint. This realignment helps redistribute weight from the worn-out part of the knee to the healthier side, reducing pain and slowing arthritis progression.
- Bone is stabilized with metal plates and screws: Once the correct alignment is achieved, metal plates and screws are used to hold the bone firmly in its new position. This stabilization allows the bone to heal properly and maintain the corrected alignment.
- Surgery usually takes 1–2 hours: The entire procedure typically takes between one to two hours, depending on the complexity of the correction and the surgical technique used.
- Hospital stay is typically 2–4 days: After surgery, patients usually stay in the hospital for two to four days for pain management, monitoring, and initiation of physiotherapy. The exact duration depends on the patient’s recovery and overall health.
Benefits of High Tibial Osteotomy
High Tibial Osteotomy has a few key benefits, particularly for young active patients, including:
It maintains the natural knee joint. The implant does not require the removal of the natural joint.
Delays or avoids knee replacement surgery: HTO can help postpone knee replacement surgery for many years by minimizing further irritation to the damaged knee.
Relieves pain and increases mobility: By realigning, pressure is taken off the damaged cartilage, relieving pain and allowing greater mobility.
Suitable for young and active patients: It is most suitable for candidates who are considered young for knee replacement and still desire to remain active.
Enables a return to sports and physical activities: Patients are also able to return to sports, exercise, and regular activities after a complete recovery.
Recovery After High Tibial Osteotomy
Recovery is gradual and requires commitment to rehabilitation.
- First 6 weeks: Limited weight-bearing with crutches: During the initial healing phase, the operated bone needs time to unite. Patients are advised to avoid putting full weight on the leg and use crutches or a walker. This helps prevent stress on the surgical site and ensures proper bone healing.
- 6–12 weeks: Gradual increase in walking: As bone healing progresses, patients are gradually allowed to increase weight-bearing. Walking distance and activity levels are slowly increased under medical supervision to improve strength and balance without overloading the knee.
- 3–6 months: Return to daily activities: By this stage, most patients can resume routine activities such as walking normally, climbing stairs, and performing daily household or work tasks. Pain and stiffness usually reduce significantly during this period.
- 6–12 months: Full recovery and sports participation: Complete recovery may take up to one year. Patients can return to sports and high-impact activities once muscle strength, joint stability, and flexibility are fully restored and approved by the doctor.
How Long Do the Results Last?
Studies show that HTO can provide pain relief for 10–15 years or more, especially when performed in the early stages of arthritis. If arthritis progresses later, knee replacement surgery can still be done successfully.
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