Ergonomic seating sits in an awkward place: close enough to health to deserve clinical scrutiny, but not close enough to be medical treatment. We take that seriously, which is why every ChairGrade rating passes through a licensed physiotherapist before publication — and why we are equally careful to explain what that review does not entitle us to claim.
Chairs shape posture over thousands of hours. That is a mechanical influence on the body, and a mechanical influence is something a clinician can assess. So rather than treat ergonomics as a matter of taste dressed up in health language, we have a medical reviewer examine the postural reasoning behind each rating. This page describes who does that, what they look at, and the limits we place on our own claims.
Who reviews our content
ChairGrade's medical review is conducted by a licensed physiotherapist with a professional interest in seated posture and musculoskeletal load. Our current reviewer is identified in the trust panel on every page we publish, along with their credentials, so that readers can see who stands behind the clinical dimension rather than taking an anonymous "medically reviewed" badge at face value. We name our reviewer because accountability requires a name.
The reviewer is not a member of the commercial team, is not involved in affiliate decisions, and does not see which chairs earn ChairGrade a commission. Their role is strictly to assess whether the postural and support claims we make are defensible given the chair's measured geometry. That separation is deliberate: clinical review has value only if it is independent of the outcome the business might prefer.
What a clinical review actually examines
Medical review here is specific and technical, not a general endorsement. The reviewer works from the same measurements our testers produce and assesses the following, in order.
Lumbar support against spinal geometry
The lumbar region of the spine curve inward; support is useful only when it meets that curve at the correct height and depth for the sitter. The reviewer checks whether the chair's lumbar apex sits where a lumbar curve actually needs support across the chair's height range, and whether it can be adjusted forward to contact the back rather than requiring the back to reach for it. A lumbar "support" that sits above or below the curve, however luxurious it looks, fails this check and is described as failing it.
Seat depth and knee angle
Seat depth determines whether a sitter can rest their feet flat with a neutral knee angle. Too deep, and the front edge presses into the back of the thigh and pulls the pelvis forward; too shallow, and the thighs are unsupported. The reviewer assesses the chair's depth against its stated height range and flags where a given depth ceases to suit a given body size — the single most common source of discomfort that a headline comfort score will not reveal.
Recline and posture through the working day
A backrest that supports well only when the sitter is bolt upright is not supporting the posture people actually hold. The reviewer examines how support behaves through recline, whether the chair encourages a supported relaxation or a slumped collapse when the backrest moves, and whether the recline range is appropriate for the kind of work the chair is sold for.
Pressure and circulation at contact points
Where the body contacts the chair — the ischial region, the thighs, the back — sustained pressure affects circulation and comfort. The reviewer considers whether the seat surface distributes load or concentrates it, and whether the front edge and armrests create avoidable pressure, given the measured firmness and geometry.
Posture claims in our written copy
Finally, the reviewer checks our own language. Where we describe a chair as supporting a particular posture or relieving a particular load, the reviewer confirms that the claim follows from the measurement, and where it does not, the claim is removed or softened. A large part of clinical review is preventing the publication from promising more than the evidence supports.
The scope, and the limits, of "medically reviewed"
The phrase "medically reviewed" is used loosely across the internet, so we define ours precisely. A ChairGrade clinical review means that a licensed physiotherapist has examined the mechanical and postural reasoning behind a seating rating and found it defensible. It does not mean any of the following, and we would rather state the exclusions plainly than let them be assumed.
- It is not medical advice. Our reviews do not diagnose, treat, or manage any condition. Nothing on ChairGrade is a substitute for consultation with a qualified professional who can assess your individual circumstances.
- It is not a claim that a chair prevents or cures pain. We do not state that any chair prevents, reduces, or resolves back pain, sciatica, or any other condition. Seating is one input among many, and individual outcomes vary widely.
- It is not an individual fit assessment. Our reviewer assesses a chair against general anthropometric guidance, not against your body. A chair that passes clinical review may still be a poor fit for a specific person.
- It is not a substitute for a clinician's care. If you have an existing musculoskeletal condition, a seating decision worth thousands of working hours should be discussed with your own physiotherapist or physician, who knows your history.
We are explicit about these limits not to dilute the value of clinical review, but to define it. A claim that is bounded can be trusted within its bounds; a claim that is unbounded cannot be trusted at all.
Why seating gets this scrutiny when furniture usually does not
Most furniture is not reviewed clinically, and most of it does not need to be. A sofa is sat on for a film; a dining chair for a meal. An office chair is different in kind, if not in category. At roughly 1,600 seated working hours a year, a chair is an exposure comparable in duration to a serious amateur sport, sustained and repetitive, applied to the same joints and tissues day after day. Musculoskeletal discomfort that develops from sustained poor posture is gradual and easy to attribute to anything else, which makes the seating variable easy to overlook and, once improved, easy to benefit from without ever noticing why.
That asymmetry — a large, slow, mostly invisible effect — is exactly the kind of variable that benefits from clinical attention and suffers from neglect. It is why we treat the postural dimension as something to be checked rather than something to be marketed, and why a physiotherapist, and not a copywriter, has the final word on whether our support claims stand.
How the clinical review is documented
A review that leaves no trace is indistinguishable from no review at all. So each clinically reviewed rating carries a visible record: the reviewer's name and credentials, the scope of the review, and the date the clinical sign-off occurred. When a chair is re-tested or a claim is revised, the clinical review is repeated and re-dated, rather than left standing on an earlier assessment. This is partly for accountability and partly for usefulness — a reader can see not only that a physiotherapist looked at the reasoning, but when, and against which version of the method.
The reviewer's objections are also recorded, not just their approval. Where a claim was softened or removed at the reviewer's request, the review text reflects the corrected position rather than the original overreach. That is how it should be: the value of clinical scrutiny is realised in what it changes, and a review that never changed anything would suggest either perfection we do not have or scrutiny that was not real.
Ergonomics vocabulary worth knowing
Clinical review is easier to follow when the vocabulary is clear, so here are the terms that do the most work in our reviews, defined plainly.
- Lordosis. The natural inward curve of the lower spine. Good seating supports this curve; poor seating flattens or reverses it, which is what allows a slouch to settle in over the course of a day.
- Ischial tuberosities. The two bones at the base of the pelvis that carry your weight when you sit — the "sit bones". Seat comfort is largely a question of how load is distributed around these two points.
- Sacrum. The triangular bone at the base of the spine, between the lower back and the pelvis. Support at the sacrum helps stabilise the pelvis, which is where sound seated posture begins.
- Popliteal region. The area behind the knee. A seat pan that is too deep presses here, which pulls the pelvis forward and undoes the lumbar support above it.
- Neutral knee angle. A roughly ninety-degree angle at the knee with the feet flat, the posture in which the lower body is most relaxed and the spine easiest to support.
- Musculoskeletal load. The cumulative demand that sitting places on muscles, joints, and connective tissue. It is the underlying quantity our reviewers and testers are both trying to manage.
Ergonomic design is not the same as clinical support
One reason the market is confusing is that "ergonomic design" and "clinical support" are treated as synonyms when they are not. Ergonomic design is a design intention: a product shaped around the dimensions and movements of a human body. Clinical support is a claim about the body's response — that a given geometry loads tissue well or badly for a given person. A chair can be ergonomically designed and still, for a specific body, support badly. A chair can look unremarkable and fit a particular torso and leg length better than a flagship.
This is why our reviews lead with measurements and only then with conclusions, and why our clinical reviewer assesses geometry rather than aesthetics. "Ergonomic" in marketing copy tells you that someone designed with a body in mind; it does not tell you that the design fits your body. Only the numbers, read against your own dimensions, can do that. That is also why we resist language that equates a well-designed chair with a clinical outcome: the design is the input, and the outcome belongs to the individual.
Claims we will not publish
Clinical review functions as a filter, and it is worth stating what the filter removes. We do not publish claims that a chair prevents, treats, or cures a named condition; claims that a specific chair is "recommended" for a diagnosis; claims that a product relieves pain, however phrased; or claims that seating can substitute for exercise, movement breaks, or professional care. Where source material or a manufacturer's own copy makes such claims, we do not repeat them, and we say so if their absence is conspicuous.
We also remove softer overreach: the suggestion that a chair will "fix" posture, that pressure-relief features eliminate the need to change position through the day, or that a premium product is clinically superior to a well-fitted modest one. Posture is movement, and the best chair is one that supports a body that still changes position. A seating review that implied otherwise would be telling a comfortable story rather than a true one. So if you wonder why our reviews sometimes read more cautiously than an advertisement, this is the reason: the cautious wording is the one the evidence permits, and it is the one we are prepared to defend.
What to do if you have a specific condition
If you are choosing a chair because of a diagnosed or suspected condition, the sequence matters. Speak to a clinician first — ideally one who can assess your posture, your work setup, and your history — and treat our measurements as a tool for that conversation rather than a replacement for it. Because we publish the raw geometry, you can bring a specific question to your clinician: not "is this chair good?" but "this chair supports the lumbar curve at forty-five millimetres with a seat depth of five hundred, is that appropriate for me?" That is a question medicine can answer, and it is the kind of question our method is built to make possible.
If you believe we have made a postural claim that is not supported by our measurements, tell us. Clinical claims are the ones we least want to get wrong, and a challenge from a reader who knows the subject is welcome. The reviewer's role, and our editorial responsibility for everything we publish, are described further on our editorial policy and review methodology pages.