Moving Beyond the “90-Degree Obsession” in Orthotic Design

For decades, standard orthotic practice followed a predictable formula. If a patient presented with severe lower limb weakness or neurological deficits, the solution was a rigid Knee-Ankle-Foot Orthosis (KAFO) or AFO (Ankle-Foot-Orthosis). These traditional devices were built to immobilise, locked at a strict 90-degree angle to prevent joint collapse.

While standard bracing provides safety and basic clearance to prevent tripping, it often neglects a critical asset: the patient’s own capacity for neurological recovery.

Companies started, and continue, with being vocal about the “Just enough“ approach in off the shelf orthoses where a relative stiffness is used to provide just enough control for a given presentation. The term was first used in corporate clinical strategy presentations by, yep, you guessed it; our KAFO Guy.

It works, but be careful of evangelical assertions, anywhere, that one brace, probably *their brace* with one stiffness will cure all your issues.

This strategy tends to be used in non-custom orthoses in general, but also crept into custom bracing. It’s still being used today and works well, but the stiffness isn’t generally adjustable.
The Kafo Guy’s Dave was, proudly and unabashedly, at the forefront of this development, too, with two of his favourite past employers.

The KAFO Guy’s clinical philosophy challenges this traditional framework. Modern orthotics should not just be a structural splint—it must be considered with the potential to become a dynamic therapeutic tool.

By shifting the focus from static immobilisation to neuro-orthotic tuning, we can unlock better mobility, restore balance, and actively engage the recovering nervous system. We, in healthcare, increasingly understand that there is no window that closes on neuro-rehabilitation, but it might get smaller over time.

The evidence of all of this is, sadly, lacking in orthotics since there are only a few people practising this way, or designing new advanced orthotics systems to take this into account. They’ve almost exclusively been introduced to this by The KAFO Guy over the last 15 or 16 years.

Research normally takes 10-15 years to catch up with manufacturers, and other (real) genius developers, and trailblazers. And if one of the biggest companies in the world is willing to fork out millions of pounds (£) for early rehab bracing… then we are onto something.

Kafo Guy wrote a Facebook post that mentioned this, and the many proud tears of joy, recently, whilst in Leipzig, Germany here.

Standard Orthotics vs. The KAFO Guy Technique

Understanding the difference between traditional bracing and a dynamic, neuro-orthopaedic approach comes down to how we view human movement.

The Core Pillars of Dynamic Neuro-Orthotics

1. Embracing Neuroplasticity

It is believed by many that traditional rigid bracing can unintentionally cause muscle atrophy because the device does all the heavy lifting. Our approach leverages neuroplasticity—the brain’s ability to reorganise itself by forming new neural connections. By building targeted resistance and assist-tuning directly into the KAFO, we force the patient’s remaining muscle groups to actively fire, reversing neglect. But we also aim to engage any neuromuscular junctions (Motor Units at the end of nerves that make your muscle fire) to help facilitate any improvement your nervous system might be able to attain. Walking ceases to be a passive action and becomes a functional rehab session, every day.

2. Controlling the Centre of Mass

A successful KAFO does more than just support the leg; it controls how the whole body moves through space. By precisely manipulating alignment, we can alter ground reaction forces. This alignment shift directly changes how a patient manages their centre of mass, making balance more intuitive and reducing the energy expenditure required to walk.

3. Precision Tuning Over “Locking”

Instead of relying solely on a static cast, my clinical training and consultancy services place immense weight on live, real-time tuning. By utilising adjustable clinical trial components, we can systematically alter the angle of the lower leg segment during actual gait analysis. This ensures the final orthosis is perfectly calibrated to the patient’s real-world movement limits. We might still use a lock for confidence sake in more complex environments outside the rehab setting.

4. Progress

You may find that your abilities change such that, after a few months (or 6 /12 years in one case) you can move into something designed for someone with higher abilities.

Find out more

End-Users (Patients/Clients)

This was written for you, really. Keep following our articles and use them to write questions for when you see your clinician. There is nothing worse than sitting in front of one of those scary Consultants and going blank. Take a list. And remember these scary consultants are not scary. They are professionals; Mothers, Fathers, Children; who want to answer everything you ask, within limits, and if the answer exists.

Professionals

Orthotics practise is evolving past the era of simply locking joints in place. If you are a clinician looking to advance your skillset in complex neuro-orthopaedic bracing, or an organisation looking to optimise patient outcomes, then incorporating dynamic tuning is the next step forward.

Explore our upcoming practical clinical courses, by contacting BAPO or get in touch for specialist consultancy services.

Explore BAPO KAFO Course Details
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