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News, Trends, and Insights from the World of Hip and Knee Replacement and Beyond

Read up on the research transforming total joint arthroplasty – and the BIOLOX® ceramic components shaping the future of patient care. 

German flag with the word “REGISTRY” in a gray band.

Joint replacement in Germany: Procedure year 2025 in key takeaways

This year’s Endoprothesenregister Deutschland (EPRD) Annual Report sets a registry record, with 422,368 hip and knee procedures documented. Knee documentation has grown by about 29% since 2022, and hip documentation by 11%.

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Illustration of a knee implant in an MRI scanner with the text “Clinical Results.”

When a surgeon orders an MRI for a painful joint replacement, is there a way to keep artifact from limiting the available solutions?

Wilhelm Röntgen’s discovery of the X-ray is attributed to November 8, 1895.
131 years later, imaging is central to the work-up of a painful knee replacement. And the implant itself shapes what the radiologist can see.

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US flag graphic with a “REGISTRY” heading

82.4% of femoral heads in US elective primary THA were ceramic in 2025. In 2012, it was 38.1%.

The new American Joint Replacement Registry (AJRR) Annual Report is out, just as American Association of Hip and Knee Surgeons (AAHKS) 2026 opens in Dallas under the presidency of Dr. Antonia Chen, with Dr. Linda Suleiman, MD FAAOS as Program Chair.

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BIOLOX delta ceramic head in ceramic liner (left) and in polyethylene liner (right) on dark background

Additional evidence for BIOLOX® delta bearings: nationwide Korean data on 15,299 total hip arthroplasties

In Archives of Orthopaedic and Trauma Surgery, Lee et al. (2026) analyzed the Korean National Health Insurance database. They compared two bearing options: BIOLOX®delta ceramic-on Ceramic (DoD) vs. BIOLOX® delta ceramic-on-highly cross-linked polyethylene (DoHXLPE).

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Clinical results title graphic with a stylised hip resurfacing implant.

Glass molds in the 1930s. Teflon cups in the 1950s. Metal-on-metal in the 1990s. Ceramic-on-ceramic today.

A 2026 review in HIP International traces a century of hip resurfacing and what each generation taught surgeons.

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Exploded view of a femoral stem taper, ceramic head, and ceramic acetabular liner.

Ceramic-on-ceramic vs. polyethylene-bearings in THA: what can 120,000 hips tell us?

A new meta-analysis by Dr. Lee Rubin (Yale University) et al. in the European Journal of Orthopaedic Surgery & Traumatology pools 33 comparative studies (randomized controlled trials and observational cohorts) encompassing more than 120,000 primary THAs.

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Close-up of the Japanese flag featuring a red sun disc and the word “Registry”.

90.8% of femoral heads used in Japanese primary hip replacements last year were ceramic. 77.8% were BIOLOX®delta.

That is what clinical trust looks like at scale.

To mark the occasion, we are sharing real-world data from Japan, one of the largest hip arthroplasty markets in the world.

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CoP ceramic liner and MoP metal femoral head in polyethylene cups; labeled Clinical Results comparing bearing surfaces in primary THA.

Bearing choice and PJI risk: Evidence from a 10,602-patient THA cohort (Rothman Orthopaedics)

Periprosthetic joint infection (PJI) remains a devastating potential complication following total hip arthroplasty (THA). While bearing surface selection has traditionally been discussed in the context of wear and long-term survivorship, a growing body of research suggests that implant material may influence the local immune environment – and even pose the risk of infection.

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BIOLOX®delta CoC monoblock acetabular cup with titanium mesh shell alongside a ceramic-on-polyethylene modular cup; labeled Clinical Results.

BIOLOX®delta ceramic-on-ceramic monoblock vs. ceramic-on-polyethylene modular: what 5 years of radiostereometric analysis reveal for ceramic hip replacement

Drs. Caner Içli and Nina M. C. Mathijssen, together with colleagues at the Reinier Haga Orthopaedic Centre and Reinier de Graaf Gasthuis (Netherlands), have published a new randomized controlled trial in Acta Orthopaedica.

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