# What Is a 3D-Printed Orthopedic Implant? A Complete Guide

> How additive manufacturing produces porous titanium hip, knee and spine implants, why trabecular structures improve osseointegration, and what it means for patients and surgeons.

- URL: https://www.ak-medical-global.com/blog/what-is-3d-printed-orthopedic-implant
- Published: 2026-06-18
- Author: AK Medical Editorial Team, AK Medical Holdings Limited
- Topics: 3D Printing, Orthopedics, Education

3D-printed orthopedic implants are joint-replacement and bone-reconstruction devices manufactured layer by layer from medical-grade titanium alloy powder using additive manufacturing — most commonly electron beam melting (EBM) or selective laser melting (SLM). Unlike traditional forging or casting, 3D printing can produce **porous trabecular structures** that closely mimic natural cancellous bone.

## Why porosity matters

Natural bone is not solid. Its inner (cancellous) structure is a lattice of interconnected struts. When an implant surface replicates this geometry:

- **Bone grows into the implant** (osseointegration) rather than merely around it
- The elastic modulus of the porous layer is closer to that of bone, reducing stress shielding
- Long-term fixation can be achieved without bone cement in many indications

AK Medical's proprietary **3DACT™** (3D printing precision building technology) platform produces implants with an interconnected porous structure whose pore size and porosity are tuned to match human cancellous bone.

## Where 3D-printed implants are used today

| Application | Example devices | Typical benefit |
| --- | --- | --- |
| Hip replacement | Porous acetabular cups, augments | Cementless biological fixation |
| Spine surgery | Interbody fusion cages | Faster fusion, better endplate contact |
| Tumor reconstruction | Patient-matched prostheses | Restores segments standard implants cannot |
| Complex revision | Custom cages and cones | Fills severe bone defects |

## A brief regulatory milestone

In 2015, the China National Medical Products Administration (NMPA, then CFDA) approved AK Medical's 3D-printed acetabular cup — the **first 3D-printed orthopedic implant approved in China**. Developed with Peking University Third Hospital, it was reported at the time as the first 3D-printed artificial hip registered after clinical validation [1][2]. Mid-term studies of the 3D ACT™ cup have since reported 100% cup survival at a mean follow-up of about 3.5–4 years, in cohorts of 92 and 236 patients [3][4]. Since then, more than one million AK Medical implants have been used in over 40 countries.

## What patients should know

3D printing does not change the fundamentals of joint replacement surgery: implant selection, surgical technique and rehabilitation still determine outcomes. What it changes is the *fit* — both the mechanical fit of porous surfaces against living bone, and the anatomical fit when implants are custom-built from a patient's CT data through platforms such as **ICOS™** (Innovative Custom Orthopedic Solution).

If you are a surgeon or hospital interested in 3D-printed implant systems, [contact our clinical team](/#contact) or browse the [full product catalogue](/products).

## References

1. 健康时报 (Health Times, People's Daily), 12 October 2015 — report on the registration of the 3D-printed artificial hip developed by Peking University Third Hospital and Beijing AKEC Medical. [paper.people.com.cn](https://paper.people.com.cn/jksb/html/2015-10/12/content_1625316.htm)
2. South China Morning Post, 2015 — "'Just the beginning': China approves world's first 3D-printed hip". [scmp.com](https://scmp.com/tech/science-research/article/1854369/just-beginning-china-approves-worlds-first-3d-printed-hip)
3. Geng et al. A new 3D printing porous trabecular titanium metal acetabular cup for primary total hip arthroplasty: a minimum 2-year follow-up of 92 consecutive patients. *Journal of Orthopaedic Surgery and Research*, 2020. [doi:10.1186/s13018-020-01913-1](https://doi.org/10.1186/s13018-020-01913-1) · [PMC7487482](https://pmc.ncbi.nlm.nih.gov/articles/PMC7487482/)
4. Chen et al. A prospective and consecutive study assessing short-term clinical and radiographic outcomes of Chinese domestically manufactured 3D printing trabecular titanium acetabular cup for primary total hip arthroplasty: evaluation of 236 cases. *Frontiers in Surgery*, 2024. [doi:10.3389/fsurg.2024.1279194](https://doi.org/10.3389/fsurg.2024.1279194) · [PMC11004300](https://pmc.ncbi.nlm.nih.gov/articles/PMC11004300/)