ISO 24562:2022

Overview

ISO 24562:2022 specifies the geometrical dimensions and tolerances for adult modular adapters used in lower‑limb prosthetic systems. The standard defines the critical interface geometry for convex (pyramidal male) and concave (pyramidal female) modular connectors, and describes the required contact conditions to support safe, repeatable assembly of modular prosthetic components.

Key points in the standard emphasize that the convex dome radius must be greater than the concave radius and that the concave contact surface is designed as an outer ring to control the actual contact area.

Key Topics

• Connector types: Convex (male/pyramidal) and concave (female/pyramidal) modular adapters.
• Critical dimensions and tolerances:
  • Convex dôme radius (D): 25.00 mm (minimum 25.00 mm - maximum 25.60 mm).
  • Concave receiver dôme radius (D): 24.70 mm (minimum 24.40 mm - maximum 24.99 mm).
• Contact geometry: The concave surface is intentionally ring‑shaped to limit contact to the designed area and avoid weak points caused by incomplete surface engagement.
• Design rule: The convex dome radius (including tolerances) must exceed the concave dome radius to ensure proper seating and load transfer.
• Risk assessment and testing: Components manufactured to ISO 24562 should comply with relevant conformity and testing standards.

Applications

ISO 24562:2022 is relevant to manufacturers, designers, clinicians and testing laboratories involved in the development, production and fitting of modular lower‑limb prosthetic systems. Practical applications include:

• Ensuring interchangeability of modular adapters across components and suppliers.
• Guiding precision machining and quality control for adapter interfaces in manufacturing.
• Supporting clinicians and prosthetists in selecting compatible components for secure fittings.
• Informing failure‑mode analysis where contact area and seating affect mechanical integrity.

Benefits of following the standard include improved compatibility between components, predictable mechanical behavior at the interface, and a reduced risk of connection failures when components are used as intended.

Related Standards

• ISO 22523 - Requirements and test methods for external prostheses and orthoses: referenced for conformity of manufactured components.
• ISO 10328 - Structural testing of lower‑limb prostheses: dimensional interfaces from ISO 24562 should be used when preparing test specimens.
• ISO 22675 - Tests for ankle‑foot components and foot units: modular adapter dimensions inform assembly of systems under test.

Manufacturers and test laboratories should use ISO 24562:2022 alongside these referenced standards to ensure compliant design, consistent testing, and reliable modular prosthetic assemblies.