First MPJ Hemi Implant

The proven joint fusion alternative*

The BioPro First MPJ Hemi Implant is the globally trusted solution for the treatment of hallux rigidus/limitus. Now in clinical use for over 65 years, the First MPJ Hemi Implant continues to demonstrate improved motion, long-term survivorship, and pain relief.


  • Five standard sizes, available in porous and non-porous coated
  • Minimal bone resection technique preserves the FHB
  • Low profile, diamond shaped stem provides intramedullary fixation
  • Also available for the lesser digits
  • Manufactured from cobalt chrome(available in titanium for patients with a metal sensitivity)

Why resurface the phalanx

Studies show during normal weight bearing the hallux metatarsal head is subject to forces up to 119% of patient body weight[1], compared to relatively minimal forces on the proximal phalanx. Clinical studies have shown in more than 50% of patients with metatarsal head implants, subsidence is seen.[2] Furthermore, no long term clinical data has been presented involving metatarsal head implants equivalent to the long term data available on the BioPro implant. We believe implant subsidence will ultimately prevent metatarsal head implants from providing implant survivorship of 20+ years as the BioPro phalanx based implant has shown.[3]

  1. Forces acting in the forefoot during normal gait – an estimate Jacob, H.A.C. Clinical Biomechanics , Volume 16 , Issue 9 , 783 - 7922. 
  2. Hemiarthroplasty for Hallux Rigidus: Mid-Term Results. Gheorghiu, Daniel et al.The Journal of Foot and Ankle Surgery , Volume 54 , Issue 4 , 591 - 5932.
  3. A metallic hemiarthroplasty resurfacing prosthesis for the hallux metatarsophalangeal joint.Foot Ankle Int. 1994 Nov;15(11):575-80.Townley COTaranow WS.

Minimum bone resection technique

The BioPro® First MPJ Hemi Implant is only 2mm thick, requiring minimal bone resection at the base of the proximal phalanx for proper implantation. This feature is very important for two main reasons. First, this preserves the FHB (flexor hallucis brevis), which typically attaches 6-8mm from the base. Sacrificing the FHB can result in a lack of toe purchase post-operatively. Second, the minimal resection technique maintains bone stock within the joint. This is an extremely important point should revision surgery ever be required. Typical revision for an implant is a joint fusion. The minimal resection technique employed with the BioPro® First MPJ Hemi Implant leaves sufficient bone stock to accommodate a fusion, should the need arise in the future.

*Clinical Data

  1. Long-Term Results of Hemiarthroplasty Compared With Arthrodesis for Osteoarthritis of the First Metatarsophalangeal Joint (2018)
  2. Operative Treatment for Osteoarthritis of the First Metatarsophalangeal Joint: Arthrodesis Versus Hemiarthroplasty. (2015)
  3. Short-Term Clinical Outcome of Hemiarthroplasty Versus Arthrodesis for End-Stage Hallux Rigidus. (2015)
  4. A retrospective cohort study of the BioPro hemiarthroplasty prosthesis. (2010)
  5. First metatarsophalangeal hemiarthroplasty for hallux rigidus (2010)
  6. A prospective investigation of the BioPro hemiarthroplasty for the first metatarsophalangeal joint.(2008)
  7. First Metatarsophalangeal Hemiarthroplasty for Grade III and IV Hallux Rigidus (2005)
  8. Contemporary Approaches to Stage II and III Hallux Rigidus: The Role of Metallic Hemiarthroplasty of the Proximal Phalanx (2005)
  9. BIOPRO resurfacing endoprosthesis versus periarticular osteotomy for hallux rigidus: short-term follow-up and analysis. (2003)
  10. Metallic proximal phalangeal hemiarthroplasty for hallux rigidus (1999)
  11. An Update on the Metallic Hemiarthroplasty Resurfacing Prosthesis for the Hallux (1998)
  12. A metallic hemiarthroplasty resurfacing prosthesis for the hallux metatarsophalangeal joint. (1994)