Which knee questionnaire to use for your research?
These articles reflect our opinions and thoughts on the subjects covered, not purely factual statements. We encourage readers to consult multiple sources and their own medical professionals.
After helping various knee surgeons, pharma companies, hospitals and medtech manufacturers track knee outcomes, we've seen that picking the right PRO (patient reported outcome) measure is hard.
It is a crazy balancing act between the kudos of the metric, where you want to publish/show the results, how often you want patients to do the form, the subscales you are interested in, licensing requirements, pricing, and personal preference.
This article is meant to guide clinicians or researchers designing a study - to choose the best outcome measure to demonstrate good results. Good results could mean:
- Show a new product works well
- Validate a new procedure
- Inform future patient care
The list goes on.
The questionnaires
There are seven main knee questionnaires, and each has a specific job: Oxford for UK joint replacement, WOMAC for OA trials, KOOS for sports injuries and active OA, and IKDC as the rival primary when sports journals lead the field. KOOS-12 is the fallback when patients will not complete 42 questions (and it is not the same as US registry KOOS JR), Kujala is the dedicated tool for anterior knee pain, and Forgotten Joint Score asks whether a replaced knee still nags at them day to day - useful once Oxford or WOMAC have nowhere left to go.
Oxford Knee Score
Twelve questions covering pain and daily function to produce a single total score. This is the standard UK file for knee replacement.
Designed for
Knee replacement and daily osteoarthritis. Not sport.
Not for
Isolated anterior knee pain, return to sport, or a one-week post-injection visit. The recall is the last four weeks, so that early score still includes life before the needle.
What to add
Kudos
In the UK, the credibility comes from national registries. NHS-funded hip and knee replacement has collected Oxford plus EQ-5D since 2009, the NJR links directly to that collection, and PHIN uses it for private practice. That is why any UK arthroplasty room will instantly recognise your data. In international replacement trials, however, it is common rather than dominant - of 181 published trials, WOMAC was in 34%, Oxford in 28%, and KOOS in 20%.
Geography
If you are in a UK clinic or submitting data to PHIN or the NJR, this is the form those rooms expect. That is not because it is more scientific than WOMAC, but because national programmes standardised on it years ago and are not about to change.
Cost and licensing
Managed by Oxford University Innovation. NHS and non-commercial academic use is free. Commercial studies and private healthcare organisations pay (typically around £4 per completed score, or £2 for private hospitals reporting to PHIN). It is straightforward to licence online via their click-to-licence portal.
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Forgotten Joint Score
Twelve items assessing joint awareness during everyday activities, scaled 0 to 100 where higher means the joint is forgotten. Built specifically to overcome the ceiling effects of Oxford and WOMAC.
Designed for
Joint awareness after total or partial knee replacement. The ceiling measure.
Not for
Pre-operative baseline or conservative treatment. A damaged, arthritic knee cannot be 'forgotten', so baseline scores are universally near zero.
What to add
Always pair FJS with a primary that can capture the pre-op to post-op journey. Do not use it as your only PROM.
Kudos
Developed by Behrend and Giesinger in 2012. In arthroplasty research, it is the benchmark score for separating good implants from exceptional ones. Standard PROMs like Oxford and WOMAC suffer from substantial ceiling effects (often 30% to 50% of post-op patients hit the maximum score). FJS avoids that ceiling, making it the tool of choice when comparing partial versus total knee replacements or robotic alignment techniques.
Geography
Widely accepted across European, US, and international arthroplasty literature. It is not currently the mandatory primary score in the NJR or AJRR, but it is standard in implant cohort studies and clinical trials aiming to demonstrate superior joint feel.
Cost and licensing
Freely available for clinical practice and non-commercial academic research without licensing fees. Cite Behrend et al. 2012. There are no online paywalls or per-use charges.
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WOMAC
Twenty-four items split across pain, stiffness, and function where a lower score is better. This is the universal trial language for osteoarthritis injections. The recall is the last 48 hours, so early post-injection change shows up more cleanly than on Oxford's four-week window.
Designed for
Hip and knee osteoarthritis. Injections.
Not for
Sport, isolated kneecap pain, or English NHS and NJR knee-replacement registries.
What to add
Add EQ-5D if you need a health utility score. Do not add a separate VAS pain scale, because WOMAC already has a dedicated pain subscale. If you need sport or knee-related quality of life, use KOOS instead of WOMAC - KOOS already covers the everyday OA ground, then adds Sport/Rec and QoL, so running both mostly means asking about stairs twice.
Kudos
The kudos here comes from the clinical trial literature rather than NHS registries. In replacement studies it is the single most widely used PROM (34% of published trials), and in hyaluronic acid and PRP studies it is dominant - a 2022 review of 38 randomised HA trials found that every single study used WOMAC. If you want your injection data to sit comfortably alongside global trial papers, you speak WOMAC, though it will not help you on an NJR registry slide.
Geography
Standard for US papers, international trials, and almost all hyaluronic acid and PRP studies. If you walk into a global trial meeting showing only Oxford data, you are speaking a different regional dialect.
Cost and licensing
Owned by Professor Nicholas Bellamy with no published price list. Fees are quoted individually per project after submitting a form on womac.com. Licensing can take time because there is no self-serve portal, so factor that into your timeline. In our experience, getting hold of the licence is nearly impossible, and most sponsors proceed without one.
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KOOS
Forty-two items across five subscales with no single total. Originally developed as an extension of WOMAC for active patients with knee injuries: it covers the everyday OA ground, then adds Sport/Rec and knee-related quality of life. The main challenges are length, and the awkwardness of five scores when a protocol wants one primary endpoint - in that case pre-specify a subscale (often Pain or QoL) or use a short form with a summary.
Designed for
Ligament, meniscus, cartilage, younger osteoarthritis. Sport.
Not for
A clean one-number arthroplasty audit, isolated kneecap pain, or a clinic that struggles to get long forms completed.
Rival primary and add-ons
Do not add WOMAC on top - that is duplicate everyday OA content. Add EQ-5D if you need a utility. Step down to KOOS-12 if patient drop-off is your main concern. IKDC is not an add-on here; it is the rival primary in the same sports room when your target journals already speak it.
Kudos
KOOS spans two different settings. In joint replacement trials, it appears in about 20% of papers, though neither UK nor US registries collect the full 42 items (the AJRR uses the shorter KOOS JR - which is not the same thing as KOOS-12). In sports injury and ligament reconstruction, its standing is much higher: it appears in 36% of ACL studies, and the Swedish, Norwegian, Danish, and New Zealand ligament registries all collect it.
Geography
Common in US and international sports medicine and ligament literature. If your focus is ACL reconstruction, meniscus repair, or return to sport, this is the benchmark international registers expect.
Cost and licensing
Created by Professor Ewa Roos and distributed via Mapi Research Trust / ePROVIDE. Free for academic research (permission always required), while hospitals and commercial users pay tiered fees. You submit a request through ePROVIDE, and electronic versions require a brief screenshot review.
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KOOS-12
A validated 12-item short form of full KOOS for clinic burden. You keep pain, daily function, and quality of life, but drop the separate symptoms and sport subscales. It is not KOOS JR - that is a different US registry short form.
Designed for
Same as KOOS when you cannot send 42 items.
Not for
Studies that strictly require dedicated sports performance metrics or the full KOOS symptoms breakdown. Also not a substitute for AJRR / CMS KOOS JR reporting.
What to add
If you need detailed sports metrics, use full KOOS from the start. Do not bolt additional questionnaires onto KOOS-12 to recover questions you cut.
Kudos
Published in 2019, its validity is borrowed from the full 42-item parent score. Major national joint registries do not collect KOOS-12 (the AJRR uses KOOS JR, a different instrument), and it will not satisfy sports journals that expect dedicated Sport/Rec subscales.
Geography
Recognised wherever KOOS is used, but treat it as a practical compromise for routine clinic follow-up rather than a substitute for full trial protocols or US registry files.
Cost and licensing
Same owner, distributor, and terms as full KOOS via Mapi / ePROVIDE. The shorter length does not give you a discount or bypass the standard approval and screenshot review process.
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IKDC
The subjective form with eighteen scored items producing a single 0 to 100 score without subscales. In sports and ligament work it is the rival primary to KOOS - same room, different journal dialect - not an add-on for Oxford or WOMAC pathways.
Designed for
Ligament, meniscus, cartilage, sports papers.
Not for
A UK NHS or PHIN joint replacement registry file, OA injection trials, or as the primary score for isolated anterior knee pain.
What to add
Add EQ-5D if you need health utility data. Do not add KOOS as well unless you specifically need its five individual domain scores, and avoid adding WOMAC. Do not bolt IKDC onto Oxford or WOMAC either - if the problem is sport and the journals speak IKDC, make IKDC the primary.
Kudos
IKDC holds huge authority in the sports surgery literature. In 510 ACL reconstruction studies, IKDC featured in 63% (rising to 72% in randomised trials). This is the default language for AOSSM and North American sports journals. While Scandinavian registries favoured KOOS, IKDC remains the gold standard if you want your surgical results to match international sports trials.
Geography
Widely favoured across North America and international sports orthopaedics. If the journals you are targeting publish in IKDC, do not switch to KOOS just for a regional preference.
Cost and licensing
Owned by the AOSSM. Academic research is completely free with no formal licence required. Commercial sponsors and health systems need to email AOSSM directly to agree terms, as there is no self-serve portal.
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Kujala
Thirteen questions scored into a single total from 0 to 100. This is the established primary score whenever the clinical problem is patellofemoral pain or instability.
Designed for
Anterior knee pain and the kneecap.
Not for
Knee replacement audits, OA injection trials, or ligament studies that already use IKDC or KOOS.
What to add
Add EQ-5D if you need a health utility. Do not use Oxford, WOMAC, or KOOS as your primary score here - none of them were validated for patellofemoral disease, and adding them does not solve the problem.
Kudos
Kujala is universally accepted for patellofemoral problems, appearing in 79% of 178 patellar instability papers (with Lysholm second at 35%). There is no national registry overriding that consensus. If your patients have anterior knee pain, this is the only primary measure with immediate credibility.
Geography
Universal across the UK, Europe, and the US. For patellofemoral disorders, the specific diagnosis matters far more than regional registry habits.
Cost and licensing
Based on Kujala's 1993 paper with no copyright holder listed on ePROVIDE and no published fee. Routine clinic and academic research simply cite the paper. Commercial programmes should still do standard due diligence on usage rights.
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How to choose
The right answer depends on the reason you are tracking, the room you need to impress, the length patients will finish, and whether you need subscales.
One chart trap before the detail: most of these scores go up when patients improve. WOMAC goes down. Mix them on one graph without flipping the axis and you will lie to yourself.
The reason you are tracking
Tracking a joint replacement is very different from monitoring an injection, just as evaluating return to sport is distinct from managing everyday patellar pain.
For knee replacement, Oxford is the standard UK file, WOMAC is the international trial benchmark, and Forgotten Joint Score tells you whether patients have truly forgotten their implant. For injections, WOMAC is the universal language of clinical trials, though Oxford remains standard in UK practice. When the focus is sport and ligaments, pick KOOS or IKDC. When the trouble is the kneecap itself, choose Kujala.
Kudos
Kudos does not come from clever questions. It comes from the room you need to convince.
Clinicians and reviewers trust a questionnaire because they have spent years reading papers, sitting through conferences, and reviewing registry reports that use that exact measure. Unless national registries or major journals shift, those expectations will stay the same for the next five years.
Before choosing, ask two practical questions: what do published papers in this subfield already cite, and what does the relevant national registry collect? If your chosen score ticks both boxes, you have instant credibility. If it ticks neither, you are hoping the room changes its habits for you.
Knee replacement
What the papers use
Of 181 replacement trials, WOMAC in 34%, Oxford in 28%, KOOS in 20%. The Knee Society Score still appears more often, but that is not a form the patient fills in alone.
What the files use
UK NHS PROMs and NJR-linked files: Oxford plus EQ-5D. PHIN: Oxford for private knee replacement. US AJRR and the CMS hospital measure: KOOS JR - not full KOOS, not KOOS-12, and not Oxford.
Osteoarthritis injections
What the papers use
WOMAC in all 38 hyaluronic acid randomised trials in one 2022 review. That is the trial language.
What the files use
No national injection registry speaking Oxford. The kudos is the trial file, not the NJR.
Ligament and sport
What the papers use
Of 510 ACL reconstruction papers, IKDC in 63%, KOOS in 36%. In the randomised trials it is even more IKDC: 72%.
What the files use
Swedish, Norwegian and Danish knee ligament registries collect KOOS. Kaiser Permanente and New Zealand also collect KOOS. Some other registers add IKDC beside it.
Kneecap
What the papers use
Kujala in 79% of 178 patellar-instability papers. Nothing else is close.
What the files use
No national kneecap file that replaces it. The papers are the kudos.
Geography
Geography does not change the underlying biology, but it dictates which registries and data sets your results must match. If the room you need to impress has already standardised on a score, stick with it rather than switching mid-programme.
For UK joint replacement, that means Oxford plus EQ-5D - the standard across the NHS, the NJR, and PHIN. In the US, joint registries like the AJRR and CMS quality measures look for KOOS JR rather than full KOOS, KOOS-12, or Oxford.
For osteoarthritis injections, international trials almost always demand WOMAC, whereas UK clinic pathways often prefer Oxford plus EQ-5D. WOMAC's last-48-hours recall is also kinder to early post-injection reads than Oxford's four-week window - which is why UK programmes often add VAS for the first weeks. For sports injuries, North American journals lean toward IKDC while European registries use KOOS - rivals in the same room, not add-ons for Oxford or WOMAC. For anterior knee pain, Kujala is standard everywhere.
Length
Questionnaire length is not just an academic detail - it determines whether patients will actually complete their follow-ups. Twelve questions takes two minutes on a phone; forty-two questions feels like homework.
Oxford Knee Score
Forgotten Joint Score
WOMAC
KOOS
KOOS-12
IKDC
Kujala
Subscales
Subscales help pinpoint exactly where an intervention made a difference, such as separating pain relief from return to sports. The trade-off is added length and complexity when all you really needed was a single clean summary score.
Oxford Knee Score
0 to 48Forgotten Joint Score
0 to 100WOMAC
0 to 96KOOS
-KOOS-12
Summary scoreIKDC
0 to 100Kujala
0 to 100Cost and licensing
These are the licence terms and costs we have encountered in real programmes, alongside published tariffs. Always confirm directly with the copyright holder for your specific study. See our licensing disclosure.
Oxford is the easiest to licence. They have an online click-to-licence portal where NHS and non-commercial academic use is free. Commercial users pay around £4 per use, or £2 for private hospitals reporting to PHIN.
Forgotten Joint Score is free for clinical and non-commercial research use without licensing fees. Cite the original 2012 paper by Behrend and colleagues. There are no paywalls or per-use charges.
WOMAC is less straightforward. There is no public price list; you submit a request form on womac.com and wait for a tailored quote based on your study size and funding.
KOOS and KOOS-12 are managed by Mapi Research Trust via ePROVIDE. Academic use is free (though prior permission is mandatory), while hospitals and commercial users pay tiered fees. Electronic versions require screenshot validation before launch.
IKDC is completely free for academic research with no formal licence required. Commercial sponsors or hospital groups must email the AOSSM directly to agree terms, as there is no automated portal.
Kujala has no copyright holder listed on ePROVIDE and no published fee. Routine clinical audits and academic studies simply cite the original 1993 paper. Commercial programmes should still do standard due diligence on usage rights.
Clinical pathways and schedules
The right questionnaire and the right schedule. Here is what we have seen work.
Knee injection (PRP / HA / Arthrosamid)
US / trial-shaped: WOMAC. That is the language almost every hyaluronic acid and PRP paper speaks. Pair with EQ-5D if you need a utility for market access. The 48-hour recall also helps early response show up cleanly.
UK: Oxford Knee Score plus EQ-5D. That is what the IBSA programme collects. Add VAS if you care about the first weeks after the needle, because Oxford's recall is the last four weeks - so a one-week score still includes a lot of life before the injection.
Schedule: Baseline, 1 week (if using VAS), 3 months, 6 months, 12 months. Some programmes add 9 months. The Arthrosamid programme ran baseline, 3, 6, 9, and 12 months with 100% completion.
Arthrosamid example
WOMAC, Oxford Knee Score, EQ-5D and VAS. Baseline, 3, 6, 9, 12 months. 38.5-point WOMAC improvement at 4 weeks, 100% completion over 12 months.
Knee replacement (Total / Partial)
UK: Oxford Knee Score plus EQ-5D. That is the NHS PROMs file, the NJR, and PHIN. Add Forgotten Joint Score if a good replacement has nowhere left to go on Oxford.
US: KOOS JR (not full KOOS, not KOOS-12, not Oxford) for AJRR and the CMS hospital measure. Or WOMAC if the trial literature is the room you need to impress.
Europe / post-market: Usually whatever the file already used. Do not switch mid-programme.
Schedule: Pre-op (within 6 weeks before surgery), 6 weeks post-op, 6 months, 12 months. Some programmes extend to 24 months or longer for implant surveillance.
ACL reconstruction
Primary: KOOS if you need all five domain subscales (pain, symptoms, daily living, sport, and quality of life). IKDC if the sports journals you want to sit alongside already standardise on it. They are rival primaries in the same sports room - pick one for the audience, do not treat IKDC as an Oxford or WOMAC add-on.
If 42 items will not come back: Step down to KOOS-12 and accept that sport and symptoms drop out as separate subscales. Do not bolt on extra questionnaires to recover what you deliberately cut.
Schedule: Baseline (pre-op or immediately post-injury), 3 months, 6 months, 12 months, and 24 months. Return to sport is typically evaluated around 9 to 12 months.
Meniscus repair / Cartilage procedures
Primary: Same as ACL: KOOS or IKDC. Avoid Oxford as the primary here, even in the UK, unless the only clinical question is everyday function in an older cohort.
Schedule: Baseline, 6 weeks, 3 months, 6 months, 12 months, and 24 months. Cartilage repairs often track out to 5 years for long-term durability.
Anterior knee pain / Patellofemoral disorders
Primary: Kujala. The kneecap is the diagnosis, and geography does not change the science. Do not use Oxford, WOMAC, or KOOS as your primary score - they were not validated for patellofemoral disease, and adding one does not fix the gap.
Pair with: EQ-5D if you need health utilities for economic modeling or market access.
Schedule: Baseline, 6 weeks, 3 months, 6 months, and 12 months. For conservative care (physio, bracing), use tighter follow-ups every 2 to 4 weeks during the first 3 months.
Multi-centre OA study (manufacturer-sponsored)
Trial-shaped (regulatory / RWE): WOMAC is the standard language for global trials. Pair with EQ-5D for health utilities. Avoid running WOMAC and KOOS together - you will just end up asking patients about stairs twice.
UK NHS-shaped: Oxford plus EQ-5D. That is what the IBSA programme collects for its UK sites. Some international programmes collect both Oxford and WOMAC when sites are split between UK clinics and US or European trial centres.
Schedule: Depends on the intervention. Injections: baseline, 1 week (optional), 3, 6, 9, 12 months. Implants or devices: baseline, 6 weeks, 6 months, 12 months, 24 months, then annually for PMCF.
Experience
If you are picking a knee questionnaire for real work, this is usually where you sit.
Hospitals
PHIN compliance,PROMs for clinicians, and the UK-shaped files that sit next to NHS and NJR expectations.
Get in touch →Private clinicians
Interested in tracking outcomes, trying a new PRP protocol, or following patients after robotic surgery - without turning follow-up into admin.
Try it now →Pharma / medtech
Programmes we have actually run for knee OA products:
- Arthrosamid- WOMAC, Oxford, EQ-5D, VAS; 100% completion over 12 months.
- IBSA / Sinovial- UK-shaped Oxford + EQ-5D across ~100 patients.
- Anika / Cingal- trial-shaped WOMAC in the UK and Germany.
Sources
- Dawson J, Fitzpatrick R, Murray D, Carr A. Questionnaire on the perceptions of patients about total knee replacement. J Bone Joint Surg Br. 1998. PubMed
- Murray DW, et al. The use of the Oxford hip and knee scores. J Bone Joint Surg Br. 2007. doi:10.1302/0301-620X.89B8.19424
- Harris K, et al. Systematic review of measurement properties of patient-reported outcome measures used in patients undergoing hip and knee arthroplasty. Patient Relat Outcome Meas. 2016. doi:10.2147/PROM.S81167
- Price AJ, et al. The use of patient-reported outcome measures to guide referral for hip and knee arthroplasty. Bone Joint J. 2020. doi:10.1302/0301-620X.102B7.BJJ-2019-0102.R2
- National Joint Registry. PROMs. njrcentre.org.uk/research/proms
- Bellamy N, et al. Validation study of WOMAC. J Rheumatol. 1988. PubMed
- Roos EM, et al. Knee Injury and Osteoarthritis Outcome Score (KOOS). J Orthop Sports Phys Ther. 1998. koos.nu
- Gandek B, Roos EM, Franklin PD, Ware JE Jr. A 12-item short form of the Knee injury and Osteoarthritis Outcome Score (KOOS-12). Osteoarthritis Cartilage. 2019. doi:10.1016/j.joca.2018.11.011
- Irrgang JJ, et al. Development and validation of the International Knee Documentation Committee subjective knee form. Am J Sports Med. 2001. PubMed
- Kujala UM, et al. Scoring of patellofemoral disorders. Arthroscopy. 1993. PubMed
- Adriani M, Becker R, Milano G, Lachowski K, Prill R. High variation among clinical studies in the assessment of physical function after knee replacement. Knee Surg Sports Traumatol Arthrosc. 2023. 181 trials: WOMAC 34%, Oxford 28%, KOOS 20%. doi:10.1007/s00167-023-07375-2
- Chavda S, Rabbani SA, et al. Role and effectiveness of intra-articular injection of hyaluronic acid in the treatment of knee osteoarthritis: a systematic review. Cureus. 2022. WOMAC used in all 38 included RCTs. doi:10.7759/cureus.24503
- Berk AN, Piasecki DP, Fleischli JE, Trofa DP, Saltzman BM. Trends in patient-reported outcomes after anterior cruciate ligament reconstruction. Orthop J Sports Med. 2023. 510 studies: IKDC 63%, KOOS 36%. doi:10.1177/23259671231174472
- Hamrin Senorski E, et al. Factors that affect patient reported outcome after anterior cruciate ligament reconstruction: a systematic review of the Scandinavian knee ligament registers. Br J Sports Med. 2018. KOOS is the common PROM in the Danish, Norwegian and Swedish registers. doi:10.1136/bjsports-2017-098191
- Kaarre J, et al. Scoping review on ACL surgery and registry data. Curr Rev Musculoskelet Med. 2022. Kaiser Permanente and New Zealand ACL registries collect KOOS. doi:10.1007/s12178-022-09775-2
- Magnuson JA, et al. Patient-reported outcome scores following patellar instability surgery. Knee Surg Sports Traumatol Arthrosc. 2022. Kujala in 79% of 178 papers. doi:10.1007/s00167-021-06625-5
- Private Healthcare Information Network. Using PHIN data: hips and knees PROMs. Oxford Knee Score for private knee replacement. phin.org.uk
- American Academy of Orthopaedic Surgeons. CMS inpatient quality reporting hip and knee PROM: KOOS JR. aaos.org/registries/quality-collaborations/iqr-resources
- Oxford University Innovation. Clinical Outcomes click-to-licence portal. Fee table: NHS and non-commercial academic use free; commercial users pay. process.innovation.ox.ac.uk/clinical
- Oxford University Innovation. The Oxford Knee Score (OKS). innovation.ox.ac.uk/licence-details/oxford-knee-score-oks
- EULAR Outcome Measures Library. WOMAC. "Licensing processes and costs are determined on the basis of information specific to each research project." oml.eular.org
- Mapi Research Trust / ePROVIDE. WOMAC. Copyright: Professor N. Bellamy. Request via womac.com. ePROVIDE WOMAC
- Roos EM. KOOS. Free for academic users. Permission always required. Fees for healthcare organisations and commercial users. koos.nu
- Mapi Research Trust. The KOOS, HOOS and FAOS now distributed by Mapi Research Trust. 10 October 2023. Academic use free. Commercial users and healthcare organisations pay a fee. mapi-trust.org
- Mapi Research Trust / ePROVIDE. KOOS-12 conditions of use. Same licence tree as KOOS. ePROVIDE KOOS-12
- American Orthopaedic Society for Sports Medicine. IKDC access, licensing and fees. Academic research: no licence or fee. Companies, vendors, or healthcare systems: email AOSSM. sportsmed.org/research/resources
- Mapi Research Trust / ePROVIDE. Kujala Patellofemoral Scale. Copyright: no information. ePROVIDE Kujala
- Behrend H, Giesinger K, Giesinger JM, Kuster MS. The "forgotten joint" as the ultimate goal in joint arthroplasty: validation of a new patient-reported outcome measure. J Arthroplasty. 2012. doi:10.1016/j.arth.2012.02.001
Guy built Patient Watch at Imperial College London for his father, an orthopaedic surgeon. Today, NHS and private clinics use Patient Watch to automate questionnaire schedules, track patient recovery after injections and surgery, and collect real-world clinical evidence.
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