USFDA Guidance: For Patient-Matched Guides Used in Orthopedic Implants

Patient-matched medical devices are becoming increasingly important in modern orthopedic surgery. These devices are designed specifically for individual patients using imaging data such as CT scans or MRI scans. The goal is to help surgeons position orthopedic implants more accurately during surgery and improve overall surgical planning.

To provide clearer regulatory expectations for manufacturers, the U.S. Food and Drug Administration (FDA) published the guidance titled “Patient-Matched Guides for Orthopedic Implants” on May 7, 2026. The draft version of the document was first issued on June 28, 2023.

What Are Patient-Matched Guides?

Patient-matched guides, sometimes called patient-specific guides, are medical devices created using a patient’s anatomical information obtained from medical imaging.

These guides are designed to assist surgeons during orthopedic procedures by helping them:

• Position implants accurately

• Follow a pre-surgical plan

• Align implants according to anatomical landmarks

The devices are customized for each patient and are commonly used in procedures such as:

• Total knee replacement

• Total hip replacement

• Other orthopedic implant surgeries

The surgical plan is typically developed before surgery using imaging software and anatomical measurements.

Purpose of the FDA Guidance

The main purpose of the guidance is to explain the information manufacturers should include when submitting these devices to FDA for regulatory review.

The guidance also provides recommendations manufacturers should consider during:

• Device design

• Manufacturing

• Software development

• Surgical planning

• Validation and testing

FDA explains that because every patient-matched guide is slightly different, manufacturers should establish controlled and repeatable design processes to ensure consistent device quality and performance.

Scope of the Guidance

The guidance applies specifically to patient-matched guides used together with legally marketed orthopedic implant systems. These devices are intended to support pre-surgical planning and implant alignment based on anatomical landmarks visible on imaging scans.

The document is mainly focused on orthopedic guides designed for personalized surgical procedures.

Important Recommendations for Manufacturers

FDA outlines several recommendations manufacturers should include in their regulatory submissions.

Indications for Use

Manufacturers should clearly describe:

• The type of surgical procedure supported

• The implant systems compatible with the guide

• The intended patient population

• The imaging methods used for planning

• Important anatomical landmarks needed for guide creation

For example, a guide designed for total knee replacement should specify the implant system and surgical approach it supports.

Device Description

FDA recommends that manufacturers provide a detailed device description including:

• Guide components and sizes

• Engineering drawings

• Materials used in manufacturing

• Accessories and ancillary components

• Design features such as drill holes or cutting slots

The guidance also recommends describing any software used for:

• Image segmentation

• Surgical planning

• Guide design

Design Process Considerations

FDA highlights several important stages involved in the development of patient-matched guides.

Patient Imaging

The process usually begins with acquiring patient imaging data through:

• CT scans

• MRI scans

Manufacturers should establish imaging protocols that consider:

• Image quality

• Anatomical abnormalities

• Existing hardware

• Disease severity

• Surgical requirements

Good imaging quality is important because poor imaging may affect guide accuracy.

Image Processing and Segmentation

The guidance recommends establishing procedures for:

• Image quality control

• Segmentation methods

• Anatomical landmark identification

• Software verification and validation

If automated software tools are used, manufacturers should provide appropriate validation information to show that the software functions correctly.

Pre-Surgical Planning

FDA recommends clearly explaining how the surgical plan is developed and reviewed.

This should include:

• Implant alignment methods

• Surgical planning goals

• Healthcare professional involvement

• Plan approval procedures

Healthcare professionals should review and approve the final plan before guide manufacturing begins.

Guide Design and Manufacturing

Manufacturers should explain how patient-specific features are incorporated into the final guide design.

Important design considerations include:

• Placement of drill holes and cut slots

• Anatomical fit and stability

• Structural integrity

• Manufacturing tolerances

FDA emphasizes the importance of maintaining dimensional accuracy during manufacturing and processing.

Software Recommendations

Software plays a major role in patient-matched guide development.

The guidance recommends providing information related to:

• Software functionality

• Validation and verification

• Cybersecurity considerations

• Off-the-shelf software components

• Software modifications

FDA generally considers these software systems to require basic software documentation unless the technology involves higher complexity or unusual features.

Biocompatibility Considerations

Because these devices come into contact with tissue, bone, and blood, manufacturers must evaluate the safety of all patient-contacting materials.

FDA recommends evaluating endpoints such as:

• Cytotoxicity

• Sensitization

• Irritation

• Acute systemic toxicity

• Material-mediated pyrogenicity

The guidance also discusses the importance of controlling contamination risks associated with additive manufacturing or 3D printing processes.

Sterility and Cleaning Requirements

Patient-matched guides may be supplied:

• Sterile

• Non-sterile for hospital sterilization before use

For sterile devices, FDA recommends:

• Sterilization validation

• Sterility assurance level evaluation

• Assessment of sterilization effects on guide geometry

For non-sterile devices, manufacturers should provide validated cleaning and sterilization instructions.

FDA also emphasizes that sterilization and cleaning processes should not deform the guide or affect surgical accuracy.

Shelf Life and Packaging

The guidance explains that manufacturers should define the maximum acceptable time between:

• Patient imaging

• Planned surgery

This is important because anatomical changes over time could affect the fit and performance of the guide.

Manufacturers should also evaluate:

• Package integrity

• Shipping effects

• Device deformation during transportation

• Aging studies for sterile devices

Non-Clinical Performance Testing

FDA recommends several types of performance testing.

Designer Variability Testing

Manufacturers should evaluate whether different designers can consistently produce similar guide designs using the same patient imaging data.

This helps ensure repeatability and consistency.

Mechanical Integrity Testing

Testing should evaluate whether the guide maintains its strength and dimensional stability after:

• Shipping

• Sterilization

• Cleaning

• Surgical handling

Debris Generation Testing

FDA recommends evaluating debris generated during interaction between the guide and surgical instruments.

This testing helps assess possible safety risks associated with polymeric debris.

Implant Alignment Accuracy

One of the most important evaluations is determining whether the guide can accurately reproduce the planned implant alignment.

FDA recommends cadaveric testing to evaluate:

• Guide fit

• Surgical usability

• Implant positioning accuracy

• Alignment reproducibility

Testing should involve healthcare professionals with different levels of surgical experience.

Clinical Performance Testing

The guidance explains that clinical studies are generally not necessary for these devices.

However, FDA may request clinical evidence in situations involving:

• New indications for use

• Different technologies

• New surgical approaches

• Claims regarding improved patient outcomes

In some cases, real-world data may also support regulatory evaluation.

Labeling Recommendations

FDA recommends including labeling information such as:

• Compatible implant systems

• Instructions for proper guide alignment

• Instructions for switching to traditional surgical methods if needed

• Irrigation recommendations during debris generation

• Patient identification information directly on the guide

This information can help reduce surgical errors and improve safe device use.

Reference

For complete details, refer to the official FDA guidance: Patient-Matched Guides for Orthopedic Implants