MPJ Hemi Implants

The BioPro® MPJ Hemi Implant is the only Hemi backed by 70+ years of clinical data. Our low-profile, press-fit implants are designed to replace the articular surface of the proximal phalanx in a painful, arthritic metatarsophalangeal (MTP) joint. The procedure offers restoration of motion and pain relief, with a minimal bone resection technique.1,2

  • 20+ year survivorship data.1
  • +95% implant survivorship on average.*
  • 97% of patients would recommend the procedure.2
  • Immediate weight-bearing.
  •  ≤6 weeks return to activities.2

First MPJ Hemi Implant

The First MPJ Hemi Implant is the original implant developed and first implanted in 1952 by Charles Townley, MD. We have further developed the system with additional sizing, material, and coating options allowing you to choose the best implant for the patient. 

  • 2.5mm profile thickness
  • Available in 5 sizes
  • Available in non-porous coated (NPC) with a porous coated (PC) option for improved biological fixation
  • Manufactured from cobalt chrome with a titanium option for patients with a metal sensitivity 

HemiEDGE™ Implant

Our patented HemiEdge™ uses our proven implant profile with an added edge that extends over the dorsal, medial and lateral cortices beyond the resected base of the phalanx. The plantar surface does not include the edge, preserving the flexor attachment. This edge helps ensure proper implant sizing, improves implant stability, and reduces the potential of bony overgrowth.

  • 2.5mm profile with 2mm overlapping edge
  • Available in 5 sizes
  • Manufactured from cobalt chrome

Lesser MPJ Hemi Implant

The Lesser MPJ Hemi Implant is designed to resurface the proximal phalanx in the second through fifth MTP joints. It may be used in the treatment of arthritis, Freiberg’s disease, post traumatic arthritis, and metatarsal head fractures.

  • 2mm profile thickness
  • Available in 9 sizes
  • Manufactured from cobalt chrome
  • Cannulated versions are available, allowing a k-wire to be temporarily passed through the metatarsal head to stabilize the entire digit when performed in conjunction with a hammertoe correction

A trusted alternative to fusion.

Data shows that the BioPro First MPJ Hemi Implant provides faster recovery, less pain, lower repeat surgeries, and greater patient satisfaction compared to fusion.2 

Design Rationale

Resurfacing the Phalanx

The simple design takes advantage of the favorable biomechanics of the MTP joint by resurfacing only the articular cartilage of the proximal phalanx. This allows for minimal bone resection and dorsiflexion of a durable, smooth implant on the remodeled metatarsal head. Our implants avoid the sheer forces on the metatarsal head which is shown to be as high as 119% of the patient’s body weight. The low profile allows for minimal bone resection, maintaining the flexor hallucis brevis (FHB) attachment responsible for flexion of the great toe.

Related Videos

Animation of the First MPJ Hemi Implant
Surgical demonstration of the First MPJ Hemi Implant
Surgical demonstration of the Lesser MPJ Hemi Implant
Surgical demonstration of the HemiEDGE Implant

Related Documents

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REFERENCES

  1. Townley, MD, Taranow, DO. A metallic hemiarthroplasty resurfacing prosthesis for the hallux metatarsophalangeal joint. Foot & Ankle International 1994;15(11):575-80
  2. Beekhuizen, Stefan R. et al. Long-Term Results of Hemiarthroplasty Compared With Arthrodesis for Osteoarthritis of the First Metatarsophalangeal Joint. The Journal of Foot and Ankle Surgery , Volume 57 , Issue 3 , 445 – 450
  3. Garras DN, Durinka JB, Bercik M, Miller AG, Raikin SM. Conversion arthrodesis for failed first metatarsophalangeal joint hemiarthroplasty. Foot Ankle Int. 2013 Sep;34(9):1227-32. doi: 10.1177/1071100713488093. Epub 2013 Apr 23. PMID: 23613329.
  4. Jacob, H.A.C. Forces acting in the forefoot during normal gait – an estimate. Clinical Biomechanics , Volume 16 , Issue 9 , 783 – 7922. 14.
  5. Palastanga, N., & Soames, R. (2012). Anatomy and human movement: structure and function (6th ed.). Edinburgh: Churchill Livingstone.