H1 Hip Resurfacing Arthroplasty



The H1 implant is designed and manufactured by Embody who are also sponsoring and funding the H1 hip resurfacing study. The objective of the H1 study is to look at survivorship of the H1 implant over 10 years. Participants will be closely followed by clinical review, functional scores, and imaging.

This is an international, multicentre, clinical surveillance study evaluating the clinical and radiological performance of the H1 Hip Resurfacing Arthroplasty. The first 20 patients will be enrolled in Cohort 1, a safety study. The remaining patients will be recruited into Cohort 2 which will be enrolling patients from the UK and international sites.


Hip Resurfacing Arthroplasty is a highly effective solution for many patients with pain and disability from end-stage hip arthritis. Compared to Total Hip Arthroplasty, resurfacing provides a higher level of function by more closely mimicking the native hip shape. Resurfacing is also associated with lower hip dislocation rates and lower mortality.

 Currently, available resurfacing implants are mostly made of metal-on-metal articulations, which can generate metal wear debris potentially causing soft tissue reactions. These reactions occur more often in smaller sized hips, and are therefore more common in women.

The H1 hip resurfacing implant is an evolution of existing designs. The components are made of BIOLOX®delta  ceramic. This non-toxic material has been successfully used as a bearing in many total hip replacements but has never been used in hip resurfacing. The H1 implant is uncemented; its components are fixed to the bone by a porous titanium coating sprayed with hydroxyapatite - a naturally occurring bone mineral. The rim of the components are contoured to match normal hip anatomy closer than existing designs.

In theory, the H1 implant will prove at least as equally effective in restoring function as existing designs, without the risks associated with metal or cement. The H1 implant is suitable for both men and women and it will also offer young and active patients a more conservative alternative to total hip arthroplasty. 

We must stress that the benefits and potential downside of the H1 hip resurfacing implant are currently not known and are being evaluated in this study.  We wish to test these potential benefits by making a long-term commitment to follow patients who consent to the new H1 HRA for 10 years after their operation.

Find out more about the H1 Patient Experience

H1 Photo

The all ceramic H1 hip resurfacing components