Kinematically Aligned Total Knee Replacement Surgery

A personalised approach to knee replacement aiming to restore your natural joint alignment and movement

Kinematically aligned total knee replacement is an approach to knee replacement surgery that aims to restore the knee’s natural alignment and movement patterns, rather than applying a standardised positioning for all patients. By aligning the knee based on its original structure, this approach may help support more natural movement, improved comfort, and functional outcomes, although results can vary depending on individual factors.

Careful assessment is important to determine whether this approach is appropriate for your condition, helping guide a personalised treatment plan based on your symptoms, anatomy, and goals.

What is kinematically aligned total knee replacement?

Kinematically aligned total knee replacement is a surgical technique in knee replacement surgery that aims to restore your knee’s natural alignment and movement, rather than applying a standardised position for all patients. Every knee has a unique shape, alignment, and pattern of motion. Traditional knee replacement techniques often use a more uniform alignment, whereas kinematic alignment focuses on positioning the implant components to match your individual anatomy as closely as possible. The goal of this approach is to support a knee that feels more natural in movement and function, although outcomes can vary between individuals.

Kinematic alignment uses careful pre-operative planning and surgical technique to guide implant positioning based on your specific joint structure. Assessment is important to determine whether this approach is appropriate for your knee condition, anatomy, and functional goals, helping guide a personalised treatment plan.

When kinematically aligned knee replacement may be recommended

Kinematic alignment may be considered when a more individualised approach to implant positioning is appropriate, taking into account your knee’s natural alignment and movement patterns. It is typically discussed in the setting of advanced knee arthritis or joint damage, where symptoms are significantly affecting your daily activities, similar to other forms of knee replacement surgery.

This approach may be considered when:

Non-surgical treatments, such as physiotherapy, medications, or injections, have not provided sufficient relief
You have persistent knee pain affecting walking, standing, or everyday function
There is reduced movement or stiffness in the knee
Imaging shows advanced joint changes, often involving multiple compartments of the joint

Kinematically aligned knee replacement is not suitable for all patients. The decision depends on factors such as your individual anatomy, ligament stability, bone quality, and overall health.

Preparing for kinematically aligned total knee replacement surgery

Preparing for kinematically aligned total knee replacement involves a combination of medical assessment, personalised surgical planning, and practical preparation to support a safe procedure and smooth recovery. Before surgery, Dr Tulloch will perform a comprehensive assessment, including a clinical examination and imaging such as X-rays and, in some cases, CT scans. These images are used to understand your individual knee anatomy and natural alignment, which helps guide the surgical plan.

You will also receive pre-operative instructions, which may include guidance on:

Fasting prior to surgery
Managing or temporarily stopping certain medications
Preparing for your hospital admission
Organising walking aids, such as crutches or a walker

Optimising your general health before surgery may support your recovery. This can include:

Maintaining a healthy weight
Stopping smoking, where applicable
Managing underlying medical conditions
Completing a prehabilitation (pre-surgery physiotherapy) program to improve strength and mobility

It is also important to prepare your home environment for your return after surgery. This may include arranging support from family or friends, ensuring a safe walking space, and placing frequently used items within easy reach.

What happens during kinematically aligned knee replacement surgery

The Kinematically aligned total knee replacement is typically carried out under general anaesthesia or regional anaesthesia (such as a spinal anaesthetic), so you will be comfortable throughout.

Surgical technique
This approach involves detailed pre-operative planning and the use of specialised instruments and imaging, which help guide implant positioning based on your unique anatomy and natural alignment.

During the operation:

An incision is made at the front of the knee to access the joint
The damaged cartilage and a small amount of underlying bone are carefully removed from the femur, tibia, and, where appropriate, the patella
Implant positioning is guided by your natural joint alignment and movement patterns
Specialised components are placed to resurface the joint and restore function

Once the implants are in place, the knee is assessed for alignment, stability, and range of motion. The incision is then closed and dressed, and you will be transferred to recovery for monitoring.

Duration
Surgery typically takes approximately 1–2 hours, although this can vary depending on individual factors.

While the overall procedure is similar to a standard total knee replacement, the key difference is the focus on individualised alignment, tailored to your specific anatomy. Dr Scott Tulloch will explain your personalised surgical plan and what to expect as part of your care.

Understanding the risks and considerations

All surgical procedures carry potential risks, and kinematically aligned total knee replacement is no exception. Understanding these risks and considerations can help you make an informed decision about your care.

Some risks are common to most operations and may include:

Infection
Bleeding
Blood clots (deep vein thrombosis or pulmonary embolism)
Reactions to anaesthesia

There are also considerations specific to total knee replacement, regardless of alignment technique. These may include:

Persistent pain or incomplete relief of symptoms
Stiffness or reduced range of motion
Instability, where the knee does not feel fully supported
Implant wear or loosening over time
Nerve or blood vessel irritation, which is uncommon

With a kinematically aligned approach, the aim is to match your natural joint alignment, which may influence how the knee feels and functions after surgery. As with any surgical technique, outcomes can vary depending on your individual anatomy, joint condition, and overall health. In some cases, further treatment or revision surgery may be required if complications develop or if the implant does not perform as expected.

What to expect after surgery

Recovery after kinematically aligned total knee replacement follows a structured and progressive pathway, similar to standard knee replacement procedures, with a focus on managing pain, restoring movement, and returning to daily activities.

Hospital stay
Most patients stay in hospital for 2–3 days following surgery for monitoring and early recovery, although this can vary depending on your progress.

Pain management
It is common to experience pain, swelling, and stiffness in the early stages. These symptoms are managed with:

Medications prescribed by your care team
Cold therapy (ice) to help reduce swelling
Elevation of the leg to support circulation

Assistive devices and mobility
You will usually begin mobilising soon after surgery, often on the same day or the following day with guidance from a physiotherapist.
Crutches or a walker may be needed initially to support walking and reduce pressure on the knee.

Discharge instructions
Before leaving hospital, you will receive guidance on:

Wound care and dressing management
Activity restrictions and safe movement
Managing pain and swelling
Recognising signs of complications

Early movement is encouraged, and you will begin a physiotherapy program to help restore range of motion, strength, and function.

Recovery progresses over time, with gradual improvement in mobility, comfort, and confidence. While the surgical alignment approach is tailored to your anatomy, the overall recovery process remains similar, with progress depending on your individual response to rehabilitation

Rehabilitation and recovery after surgery

Rehabilitation following kinematically aligned total knee replacement is a key part of your recovery, focused on restoring movement, strength, and confidence in the knee while supporting healing.

In the early stages after surgery, the priority is to regain range of motion and begin walking safely. You will start a structured physiotherapy program soon after surgery, with exercises designed to improve flexibility, circulation, and muscle activation. Walking is encouraged early, often with the support of crutches or a walker, progressing as your strength and confidence improve.

As recovery progresses, rehabilitation focuses on rebuilding muscle strength, particularly in the quadriceps and surrounding hip muscles, as well as improving balance and movement control. This supports everyday activities such as walking, climbing stairs, and standing for longer periods.

During the early stages, you will be advised to avoid high-impact activities to protect the joint while it heals. Activity levels are gradually increased based on your progress and symptoms.

Recovery timeline
Recovery is typically progressive over several weeks to months. Many patients notice improvement in pain and mobility within the first 6–12 weeks, with continued gains in strength and function over time. Full recovery can vary between individuals and may take several months.

Ongoing participation in your physiotherapy program and maintaining an active, healthy lifestyle can help support long-term outcomes.

Long-term outcomes after kinematically aligned knee replacement

Long-term outcomes following kinematically aligned total knee replacement are influenced by your overall health, activity level, joint condition, and engagement in rehabilitation. Many patients experience improvement in knee pain and function, supporting a return to daily activities such as walking, work, and low-impact exercise. By aligning the knee to better reflect your individual anatomy, this approach aims to support a more natural pattern of movement, although outcomes can vary between individuals.

The implant components used in knee replacement are designed to be durable, with many lasting 15–20 years or longer. Longevity can be influenced by factors such as activity level, body weight, general health, and how the joint is used over time.

It is important to understand that:

Function and comfort may change over time
The implant may be subject to wear or loosening
Some patients may require further treatment or revision surgery in the future

Regular follow-up is recommended to monitor the condition of the knee and implant, particularly if new or changing symptoms develop. Maintaining a healthy, active lifestyle, including appropriate physiotherapy and low-impact exercise, may help support joint function and the longevity of the replacement.

Dr Scott Tulloch will provide ongoing guidance to help you achieve the best possible outcome based on your individual circumstances.