Modern medicine is rapidly evolving, from standardised to patient-specific implant design. To date, many disciplines rely on a broad selection of off-the-shelf prostheses, for instance, hip and knee replacements, stents and heart valves. However, advancements in medical imaging, biomaterials, and digital planning tools now also enable tailored solutions for individual patients.
By using high-resolution imaging and precise planning workflows, physicians can make better-informed decisions based on patients’ unique anatomy and functional needs. This can often minimise treatment complications and shorten patient recovery times.
In this post, we will take you on a journey from imaging to personalised surgery. We’ll examine how efficient image exchange can facilitate the process of customised implant manufacturing.
Indications for Customised Implants
Choosing between standardised and customised implants depends on several factors. These include clinical condition, anatomic complexity, desired treatment outcome, and the physician’s expertise.
In routine scenarios, like trauma, orthopaedic or spinal surgeries, surgeons often prefer standardised implants due to their availability, cost-effectiveness and predictable surgical protocols.
Patient-specific implants are increasingly used in situations where
- The patient’s anatomy is distorted,
- Cosmetic or functional outcomes significantly impact the patient’s quality of life,
- Conventional implants fail to provide adequate fit or stability.
Key therapeutic areas where they have shown remarkable benefits include orthopaedic oncology and complex fracture management, cardiovascular implants, cranio-maxillofacial and dental reconstruction.
For those seeking personalised medical interventions, patient-specific implants (PSIs) offer a better fit, fewer complications and elevated satisfaction levels.
The Imaging-to-Surgery Workflow
Let’s delve into a typical six-step workflow for patient-specific implants used in hard tissue reconstruction, such as neurosurgery, orthopaedics, or craniofacial surgery:
(1) Image Acquisition: High-resolution CT or MRI scans capture the necessary anatomical details. These images, stored in DICOM format, serve as a blueprint for accurate implant design and manufacturing.
(2) Image Exchange: Secure and efficient image transfer to the implant manufacturer is essential. Cloud-based or integrated sharing platforms can expedite this process. They ensure interoperability between hospital systems and manufacturing software and minimise errors from manual data transfer (CDs, USBs). Key considerations include documentation of patient consent, pseudonymization or de-identification for patient privacy, and optimal implant-patient matching.
(3) Design and Planning: Upon image receipt, the manufacturer develops and tests various implant configurations tailored to the patient’s unique anatomy and clinical situation. The mirroring method is commonly used for symmetrical reconstruction. Complex defects may require advanced 3D modelling and structural segmentation. And mathematical techniques such as generative design or topological optimisation come into play if lightweight, stability, and strength are crucial. Surgeons often collaborate virtually, adding their insights to enhance the design process.
(4) Manufacturing: With a validated and approved design in hand, the manufacturing phase can begin. Materials like titanium and polyetheretherketone (PEEK) are frequently employed for additive manufacturing (3D printing). Whereas dental ceramics are crafted with precision using CNC milling machines. Stringent quality controls ensure that every implant meets the highest standards.
(5) Surgery: During surgery, patient-specific manuals, templates, and modified DICOM images are provided by the manufacturer. They assist surgeons in accurately positioning the implant, reducing the risk of complications.
(6) Post-Surgical Follow-Up: To monitor implant performance, regular follow-up visits and periodic imaging are conducted. This vigilant oversight ensures timely interventions in the rare event of complications and contributes to a deeper understanding of long-term results.
Challenges in the PSI Workflow
Despite the immense potential of patient-specific implants, several hurdles remain.
- Clinical: In urgent trauma or oncology cases, time is sensitive, and customised implantation is often unfeasible. Often, initial training may be necessary for physicians to effectively utilise virtual planning and intraoperative navigation tools.
- Operational: Seamless interoperability between tools and effective communication among stakeholders (hospitals, designers, and manufacturers) are crucial, especially in a global supply chain. Issues like incomplete or poor-quality imaging datasets and outdated manual transfer methods (think CDs and DVDs) are common bottlenecks that must be addressed.
- Regulatory: PSIs fall under “custom-made device” regulations, for instance, EU MDR and FDA CDE. Manufacturers must adhere to these regulations for every implant and provide full documentation, traceability and clear design audit trails.
- Data Privacy & Security: Hosting and transfer of medical images via secure, encrypted platforms is recommended. Regulations such as GDPR or HIPAA govern imaging and design data handling. Long-term data archiving, access controls and legal accountability remain ongoing concerns.
Conclusion
A professional and regulatory-compliant image exchange solution is indispensable for facilitating the effective design of patient-specific implants. By streamlining imaging workflows and collaboration, such a platform enhances operational efficiency, ultimately leading to better patient outcomes. As personalised medicine continues to grow, embracing advanced image exchange methodologies will prove essential in meeting the evolving demands of patient care.
