| Verified against primary record | |
| Longest official surveillance window | One year, for procedures involving a prosthetic implant[1] |
|---|---|
| What a registry needs to follow up | Consent; where it is refused, no patient details are recorded and the patient cannot be contacted[2] |
| Records read | A surveillance report, two registry records, a research alert, a commissioned review and an earlier research programme, 9 October 2026 |
| Independently reported | |
| Hip survival at 25 years, registry | 57.9 per cent intact, 95 per cent interval 57.1 to 58.7, from 51,359 hips in one national registry[3] |
| Hip survival at 25 years, case series | 77.6 per cent intact, 95 per cent interval 76.0 to 79.2, from 8 series and 4,617 hips[3] |
| Bands apply only to the rows beneath them. Both 25-year figures are for domestic patients; no long-term outcome data for patients treated abroad was located. | |
Long-term outcomes of medical tourism are unmeasured, and the gap is wider than for short-term complications. Official surveillance of surgical outcomes stops at one year at the outside, registries that run longer depend on consent and linkage that a foreign operation never establishes, and the reviewers who have looked for national or regional data in this field report finding none.
Where official follow-up stops
The longest routine surveillance horizon located for this entry is one year, applied by United Kingdom infection surveillance to procedures involving a prosthetic implant, against 30 days for everything else.[1] One year is a long window by surveillance standards and a short one relative to the working life of an implant, which is the question patients actually have.
Beyond that, the instruments are registries rather than surveillance systems. One national arthroplasty registry publishes comparative prosthesis performance for devices with a follow-up of at least 20 years, over a data period running from 1 September 1999 to 31 December 2021, with a section reporting twenty-year outcomes.[4] Another has recorded over 4.5 million procedures, with its twenty-second annual report covering 1 April 2024 to 31 March 2025.[5] These are the systems capable of answering a long-term question.
What registry follow-up actually requires
Registry follow-up is not automatic. It rests on consent, identity linkage and provider compliance, each of which is reported as a rate. For one financial year a national joint registry reported an informed consent rate of 94.78 per cent, a linkability rate of 96.35 per cent, and compliance of 97 per cent for hospitals in England and Wales. Where consent is refused, the details of the operation and implants are recorded but no patient details, and that group of patients cannot be contacted for any follow-up audits or research projects.[2]
Each of those three conditions fails for an operation performed abroad. There is no consent captured by the home registry, no record of the operation to link to, and no participating provider. The registry page consulted does not state whether procedures performed abroad are recorded, so the honest position is that the question is unaddressed rather than answered. The practical consequence is the same either way: an implant fitted abroad enters a home registry, if at all, only when it is revised.
How much the method changes the answer
A worked example shows why the choice of data source matters more than the headline. A systematic review and meta-analysis of hip replacement survival with more than 15 years of follow-up found that after 25 years, 57.9 per cent of hips were still intact, with a 95 per cent interval of 57.1 to 58.7, from 51,359 hips in the Finnish registry. The same review found that after 25 years 77.6 per cent were still intact, interval 76.0 to 79.2, from 8 case series totalling 4,617 hips.[3]
Twenty percentage points separate the registry estimate from the case series estimate for the same procedure at the same follow-up point. Three further conditions belong with these figures: only the Finnish registry had follow-up data at 20 and 25 years, the review did not include data from the joint registry of England and Wales, and the body publishing the research summary states that it is not clear how generalisable the results of the study are.[3]
The familiar claim that hip replacements last 25 years collapses all of this into a single reassuring number. It is a claim about one country’s registry, with case series pointing 20 points higher, and with the publishing body cautioning about generalisability. Both figures describe domestic patients in high-income health systems with functioning registries.
The documented gap for medical travel
A commissioned review of complications and costs arising from outward medical travel records that it did not identify any studies from the past 10 years that included national or regional level data, and that no study reported on resource use or costs associated with routine long-term follow-up care after bariatric surgery.[6] Its wider finding, that there is no evidence comparing the short or long-term health of people who travel abroad for elective surgery, is the direct answer to the question this entry asks.
An earlier programme of commissioned research had already identified this as a priority, listing among its recommendations the need to better understand the medium and long-term health and social outcomes of treatment, and to generate more robust data capturing international patient activity and flows.[7] That was 2014. The 2026 review indicates the gap has not closed.
What a patient can reasonably conclude
Not that treatment abroad produces worse long-term results, which no evidence shows. Only that the long-term result of a procedure performed abroad is unlikely to be recorded anywhere, by anyone, in a form that could later be counted. Where a device is involved, the practical question worth asking a provider is which registry, if any, the implant will be entered in, and whether the patient will be given the implant’s identifying details to carry home.
See also
- Complication rates in medical tourism, the shorter surveillance windows
- Clinical outcomes in medical tourism, the absent population definition
- Orthopedic medical travel, the sector these registries cover
- Quality of life after treatment abroad, the patient-reported side of the same gap
References
- UK Health Security Agency. Surveillance of surgical site infections in NHS hospitals in England, April 2024 to March 2025. Verified against primary record: follow-up periods read in the report. Retrieved 9 October 2026.
- National Joint Registry. Data completeness and quality. Annual report, figures for financial year 2019/20. Verified against primary record: consent, linkability and compliance rates read, together with the consequence of refused consent. Retrieved 9 October 2026.
- National Institute for Health and Care Research. More than 50 per cent of hip replacements appear to last 25 years. Evidence alert, 18 June 2019, reporting Evans JT, Evans JP, Walker R, et al., How long does a hip replacement last? A systematic review and meta-analysis, Lancet 2019;393:647-654. Independently reported: research alert read, including its own caution on generalisability. Retrieved 9 October 2026.
- Australian Orthopaedic Association National Joint Replacement Registry. Comparative prostheses performance, supplementary report. 2022 annual report, data period 1 September 1999 to 31 December 2021. Verified against primary record: follow-up scope and twenty-year section read. Retrieved 9 October 2026.
- Healthcare Quality Improvement Partnership. National Joint Registry annual report 2025. Published 5 November 2025. Verified against primary record: cumulative procedure count and reporting period read. Retrieved 9 October 2026.
- England C, Bromham N, Needham-Taylor A, Hounsome J, Gillen E, Ingram BJ, Davies J, Edwards A, Lewis R. Complications and costs to the UK National Health Service due to outward medical tourism for elective surgery, a rapid review. BMJ Open, 2026;16(1):e109050; preprint at medRxiv 10.1101/2025.04.02.25325086. Independently reported: publicly commissioned review, preprint full text read. Retrieved 9 October 2026.
- Lunt N, Smith RD, Mannion R, Green ST, Exworthy M, Hanefeld J, Horsfall D, Machin L, King H. Implications for the NHS of inward and outward medical tourism. Health Services and Delivery Research, 2014;2(2), NIHR Journals Library. Independently reported: publicly commissioned peer-reviewed research. Retrieved 9 October 2026.
Sourcing note: the surveillance report, the two registry records, the research alert, the commissioned review and the earlier research programme were opened and read on 9 October 2026. The two 25-year hip survival figures are published together, with their intervals, their single-registry basis and the publishing body’s own caution on generalisability, because the familiar shorthand reports only one of them. Both describe domestic patients. Neither registry page consulted states whether procedures performed abroad are recorded, so that is reported as unaddressed rather than as exclusion.