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Metal on Polyethylene (MoP) cementless stems with proximal bone growth (PBG) features, such as those produced by Double Medical, are designed for total hip arthroplasty to achieve long-term stability via biological fixation. These titanium alloy stems utilize porous coatings or roughened surfaces to promote bone ingrowth/ongrowth, commonly paired with UHMWPE liners to reduce wear. 
Key Features of PBG Cementless Stems 
  • Material & Design: Primarily manufactured from titanium alloy for biocompatibility and elasticity similar to cortical bone.
  • Fixation Method: "Cementless" or "uncemented" means they rely on press-fit technology, allowing the bone to grow directly into or onto the porous-coated surface (proximal bone growth/ingrowth).
  • Bearing Surface: Metal-on-polyethylene (MoP) uses a metal femoral head (often cobalt-chromium) articulating against an ultra-high-molecular-weight polyethylene (UHMWPE) liner.
  • Aim: Proximal coating is designed to promote loading of the proximal femur, which helps prevent stress shielding and maintains bone density compared to fully coated stems. 
Clinical Considerations 
  • Fixation: These stems rely on initial mechanical stability (press-fit) followed by long-term biological fixation (bone ingrowth).
  • Wear: While modern cross-linked polyethylene has improved wear characteristics, historically, MoP liners were the source of wear debris.
  • Comparison: Compared to metal-on-metal (MoM) bearings, MoP generally shows lower metal ion levels, though they are subject to polyethylene wear considerations. 
  • PBG Proximal Bone Growth Cementless Stem - Double Medical
    Find PBG Proximal Bone Growth Cementless Stem from China leading brand,Double Medical is professional Metal on Polyethylene PBG Pr...
    Double Medical
  • Implant Design in Cementless Hip Arthroplasty - PMC
    SURFACE TREATMENT OF CEMENTLESS HIP REPLACEMENT IMPLANTS Osteointegration can be achieved by bone ingrowth and bone ongrowth. Bone...
    PubMed Central (PMC) (.gov)
  • Large head metal-on-metal cementless total hip arthroplasty versus ...
    Oct 8, 2008 — Metal-on-polyethylene (MP) Patients in the metal-on-polyethylene group will receive a metal-on-polyethylene total hip arthroplasty...
    National Institutes of Health (.gov)
  • Total hip arthroplasty | Radiology Reference Article
    Jul 11, 2023 — Biologic fixation uses either porous coated metallic surface to stimulate bone in growth or grit-blasted surface to allow bone on ...
    Radiopaedia
  • Cementless Femoral Stems in Primary Total Hip Arthroplasty
    Oct 16, 2025 — Titanium alloys are preferred in cementless implants due to a closer modulus of elasticity to cortical bone (100 GPa compared to 2...
    Journal of Orthopaedic Experience & Innovation
  • Cementless metal-on-metal versus ceramic-on-polyethylene hip ...
    Feb 15, 2023 — Twenty-eight millimeters MoM bearings show good survival at 20 years in young active subjects. Two groups of cementless hip prosth...
    ScienceDirect
  • What Are Hip Replacements Made Of? - AAHKS
    Historically, this is made from cobalt-chromium and/or titanium metals. In the modern era of hip replacements, cemented stems (ins...
    hipkneeinfo.org
  • Long-Term Outcome of a Metal-on-Polyethylene Cementless Hip ...
    Apr 15, 2014 — Abstract. Due to the well-documented problems surrounding metal-on-metal bearings, the use of hip resurfacing has declined. Since ...
    ScienceDirect.com
  • Metal-on-metal Versus Polyethylene in Hip Arthroplasty - PubMed
    Jan 15, 2003 — Patients were followed up for a minimum of 2 years (mean 3.2 years; range, 2.2-3.9 years). There were no differences in radiograph...
    National Institutes of Health (.gov)
  • PBG Proximal Bone Growth Cementless Stem - Double Medical
    Find PBG Proximal Bone Growth Cementless Stem from China leading brand,Double Medical is professional Metal on Polyethylene PBG Pr...
    Double Medical
  • Implant Design in Cementless Hip Arthroplasty - PMC
    SURFACE TREATMENT OF CEMENTLESS HIP REPLACEMENT IMPLANTS Osteointegration can be achieved by bone ingrowth and bone ongrowth. Bone...
    PubMed Central (PMC) (.gov)
  • Large head metal-on-metal cementless total hip arthroplasty versus ...
    Oct 8, 2008 — Metal-on-polyethylene (MP) Patients in the metal-on-polyethylene group will receive a metal-on-polyethylene total hip arthroplasty...
    National Institutes of Health (.gov)
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Web results

PBG Proximal Bone Growth Cementless Stem


Double Medical
https://www.doublemedicalgp.com › Hip Joint
Double Medical
https://www.doublemedicalgp.com › Hip Joint
Find PBG Proximal Bone Growth Cementless Stem from China leading brand,Double Medical is professional Metal on Polyethylene PBG Proximal Bone Growth ...
Metal on Polyethylene PBG Proximal Bone Growth Cementless Stem from www.doublemedicalgp.com

Large head metal-on-metal cementless total hip arthroplasty ...


PubMed Central (PMC) (.gov)
https://pmc.ncbi.nlm.nih.gov › articles › PMC2576464
PubMed Central (PMC) (.gov)
https://pmc.ncbi.nlm.nih.gov › articles › PMC2576464
by WP Zijlstra · 2008 · Cited by 25 — The objective of this study is to compare two cementless total hip arthroplasties: a conventional 28 mm metal-on-polyethylene articulation and a large head ...Read more
Missing: PBG ‎Growth

Implant Design in Cementless Hip Arthroplasty


Hip & Pelvis
https://www.hipandpelvis.or.kr › journal › view
Hip & Pelvis
https://www.hipandpelvis.or.kr › journal › view
by JT Kim · 2016 · Cited by 121 — Bone ingrowth indicates firm fixation between bone and metal through bone growth into the porous surface of metal implants. Meanwhile, bone ongrowth is ...Read more
Missing: PBG ‎| Show results with: PBG

Total hip arthroplasty | Radiology Reference Article


Radiopaedia
https://radiopaedia.org › articles › total-hip-arthroplasty
Radiopaedia
https://radiopaedia.org › articles › total-hip-arthroplasty
Jul 11, 2023 — Biologic fixation uses either porous coated metallic surface to stimulate bone in growth or grit-blasted surface to allow bone on growth. The ...Read more

Adverse Metal Reaction in a Case of Metal-on-Polyethylene ...


PubMed Central (PMC) (.gov)
https://pmc.ncbi.nlm.nih.gov › articles › PMC11189828
PubMed Central (PMC) (.gov)
https://pmc.ncbi.nlm.nih.gov › articles › PMC11189828
by N Singh · 2024 · Cited by 4 — During orthopaedic procedures, metal deposition can trigger inflammatory reactions in the body, ranging from mild discomfort and pain to more ...Read more
Missing: PBG ‎Proximal
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Web results

THA Prosthesis Design - Recon


Orthobullets
https://www.orthobullets.com › recon › tha-prosthesis-d...
Orthobullets
https://www.orthobullets.com › recon › tha-prosthesis-d...
Jan 13, 2026 — distal stem and proximal body can be "mixed-and-matched" ... results in less polyethylene wear than metal-on-polyethylene (MoP) bearings.Read more
Metal on Polyethylene PBG Proximal Bone Growth Cementless Stem from www.orthobullets.com
Missing: PBG ‎| Show results with: PBG

Metallosis After Metal-on-Polyethylene Total Hip Arthroplasty


MDEdge
https://cdn.mdedge.com › files › September-2017
MDEdge
https://cdn.mdedge.com › files › September-2017
PDF
by CA Cipriano · 2001 · Cited by 80 — The femoral component can also be a source of metallosis: Wear of a titanium femoral head, loosening of rough surface finish from the femo- ral stem, and stem ...Read more

Total Hip Replacement | Robin Orthopaedics Melbourne


Mr Daniel Robin
https://www.robinortho.com.au › total-hip-replacement
Mr Daniel Robin
https://www.robinortho.com.au › total-hip-replacement
The shell can be made purely of a plastic material called polyethylene (and this requires the use of bone cement to bond it to the patients pelvic bone – see ...Read more

THA Femoral Design Explained w/ Dr. Anna Cohen-Rosenblum


YouTube · Nailed It Ortho
4.6K+ views · 3 years ago
YouTube · Nailed It Ortho
4.6K+ views · 3 years ago
1:07:41
Enjoy this episode on Cementless THA Femoral Stem Design as Dr. Anna Cohen-Rosenblum gives us a great talk! Link to post and show notes: ...
10 key moments10 key moments in this video
Missing: Metal ‎Polyethylene ‎PBG ‎Proximal

Cementless Femoral Stems in Primary Total Hip Arthroplasty


Journal of Orthopaedic Experience & Innovation
https://journaloei.scholasticahq.com › article
Journal of Orthopaedic Experience & Innovation
https://journaloei.scholasticahq.com › article
by A Siddiqi · 2025 — Titanium alloys are preferred in cementless implants due to a closer modulus of elasticity to cortical bone (100 GPa compared to 20 GPa) that ...Read more
  • Cementless Femoral Stems In...
  • Osseointegration
  • Stem Geometry
    • Missing: Polyethylene ‎PBG
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