ISO 9585:1990 is an ISO test method used to determine the bending strength and bending stiffness of surgical bone plates used for osteosynthesis and fracture fixation.
Labs and manufacturers use this standard for design verification, supplier comparison, and quality evaluation of plate designs under controlled static bending conditions. If you need help deciding whether ISO 9585 fits your plate geometry or your required reporting, talk with our team.
ISO 9585:1990 — Implants for surgery — Determination of bending strength and stiffness of bone plates
ISO 9585 is a mechanical test method focused on straight bone plates (and it may also be used for plates with small initial curvature). It is not recommended for very short plates (below 50 mm) and is also not recommended for plates designed to be used with, or forming parts of, intramedullary devices.
Quick definition
Document type: Test method.
What it measures: Bending strength and bending stiffness of surgical bone plates.
Typical use: Bench-top static bending evaluation for comparison and verification of plate designs.
What this standard covers
ISO 9585 defines a standardized approach for bending evaluation of bone plates so that results can be compared across designs, manufacturing lots, or suppliers when a consistent fixture and setup are used.
Because implant plate designs vary widely, the exact test configuration and what constitutes a valid comparison is often driven by how the plate is intended to be used clinically. ISO 9585 is best applied when plates are long enough and shaped appropriately for the bending setup described in the standard.
Why this standard matters in testing
Bending stiffness is commonly used to compare how “rigid” different plate designs behave under bending loads, while bending strength supports comparison of the load level at which a plate yields or fails in the defined test setup.
For medical device development and manufacturing, these values are typically used as part of mechanical performance characterization and as supporting evidence in design and process controls (for example, when comparing design iterations, materials, or production changes).
Common materials, product types, or applications covered
Common product types: Metallic bone plates used as surgical implants for osteosynthesis / fracture fixation.
Common materials: Material families depend on the plate design and manufacturer (the standard is used across typical orthopaedic implant metals).
Important limitations: ISO 9585 is aimed at straight plates (and small initial curvature) and is not recommended for plates shorter than 50 mm or for plates intended for use with intramedullary devices.
Common test or verification workflow
In a typical ISO 9585 workflow, the bone plate is mounted in a controlled bending fixture and loaded in a static manner while force and deflection are captured. The test results are then used to calculate bending strength and stiffness in accordance with the standard’s definitions.
Common deliverables: Force–deflection data, calculated stiffness, and a bending strength result reported for the specific setup and plate description used.
Practical caution: Because fixture geometry, contact conditions, and measurement approach strongly influence stiffness results, edition matching and strict alignment with the cited setup are important when comparing data across labs or across plate designs.
Equipment commonly used for this standard
ISO 9585 testing is typically performed on a static mechanical test system configured for controlled bending. The exact configuration depends on the standard’s fixture requirements and the plate geometry being evaluated.
Common equipment: Universal testing machine (electromechanical or servo-hydraulic), appropriate load cell capacity, bending fixture (support and loading elements), and a displacement/deflection measurement approach suited to the required resolution.
Common accessories: Alignment hardware and fixture components that control contact points and minimize unintended torsion or off-axis loading.
If you are selecting a frame capacity, fixture approach, or data-acquisition configuration for ISO 9585 work, you can request a detailed quote for a setup matched to your plate sizes and target force range.
How to read this designation or revision
Standard format: ISO 9585:1990.
Year meaning: “1990” indicates the publication year for this edition.
Status note: ISO identifies this 1990 edition as reviewed and confirmed in 2023, meaning it remains the current edition.
Related standards, methods, or frameworks
Depending on the plate size and intended anatomical application, teams may also reference alternative bone plate test methods and requirements standards used in orthopaedic implant development programs.
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ASTM F382: A commonly used ASTM specification/test method for metallic bone plates (often referenced alongside ISO 9585 in industry contexts).
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ASTM F3437: Test methods intended for metallic bone plates used in small bone fracture fixation; it notes ISO 9585 as an available option but highlights practical setup challenges for small plates.
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ISO 14602: Particular requirements for non-active surgical implants for osteosynthesis (broader requirements context beyond the mechanical bending test itself).
Get help selecting an ISO 9585 test setup
If you share your plate geometry range, expected load range, and whether you need stiffness calculations or strength-only screening, we can help translate ISO 9585 into a practical machine-and-fixture configuration and a clean test report format. To discuss system options and pricing, request pricing.