©2026 by the American Board for Certification in Orthotics, Prosthetics & Pedorthics, Inc. All rights reserved.
No part of this document may be produced in any form without written permission of the American Board for Certification in Orthotics, Prosthetics & Pedorthics, Inc.
May 2025
After finalizing the domains and tasks, the panel received guidance on developing knowledge statements. Working in both small and large groups, they identified industry-specific knowledge and skill areas required for the competent performance of each task. As part of this process, the panel participated in a linkage activity to ensure that each knowledge and skill statement was essential to at least one task within a domain. Some statements were linked to multiple tasks or domains, while one was removed (i.e., loss control) for not being critical across most practice settings.
In addition, the panel rated when each knowledge or skill area should be acquired for successful performance—either prior to certification or after. Most statements were determined to be necessary before certification, while those identified as acquired after certification were still considered essential, though typically required at a more foundational level. For both the COA and CPA exams, this process resulted in a final set of 44 knowledge statements and 21 skill statements. A complete list of the knowledge and skills, along with their associated linkages, can be found in Appendix C.
Orthotic Assistant Knowledge Statements |
| 1. General musculoskeletal anatomy, including upper limb, lower limb, and spinal |
| 2. Basic neuroanatomy (e.g., major peripheral nerves of the upper and lower extremities) |
| 3. Anatomical landmarks (surface anatomy) |
| 4. Anatomical planes, planes of motion, and normal joint range of motion |
| 5. Normal human locomotion |
| 6. Gait deviations |
| 7. Tissue characteristics/management |
| 8. Volumetric control (e.g., edema, weight gain/loss) |
| 9. Biomechanics (e.g., actions of lever arms, application of force system) |
| 10. Pathologies, including cause and progression (e.g., orthopedic, neurologic, vascular) |
| 11. Medical terminology |
| 12. Referral documents |
| 13. Documentation techniques |
| 14. Policies and procedures regarding protected healthcare information |
| 15. Reimbursement protocols (e.g., CMS, Medicaid) |
| 16. Material safety procedures and standards (e.g., OSHA, MSDS) |
| 17. Universal precautions, including sterile techniques and infection control |
| 18. Ethical standards regarding proper patient management, including ABC Code of Professional Responsibility |
| 19. Scopes of practice related to orthotic/prosthetic credentials |
| 20. Boundaries of the orthotic/prosthetic assistant scope of practice |
| 21. Orthotic/prosthetic design and function |
| 22. Orthotic/prosthetic fitting criteria |
| 23. Orthotic/prosthetic fabrication |
| 24. Clinical examination techniques |
| 25. Impression-taking techniques, materials, devices and equipment |
| 26. Rectification/modification procedures as they relate to specific orthotic/prosthetic designs |
| 27. Measurement tools and techniques |
| 28. Orthotic/prosthetic forms (e.g., assessment, orthometry, measurement, evaluation, outcomes) |
| 29. Materials science |
| 30. Componentry |
| 31. Alignment devices and techniques |
| 32. Hand and power tools |
| 33. Care and maintenance of orthoses/prostheses |
| 34. Computer-aided design and manufacturing (CAD/CAM) |
| 35. Item warranty and warranty limitations |
| 36. Research and literature |
| 37. Human development and aging, ranging from pediatric to geriatric, as they relate to orthotic treatment |
| 38. The psychology of the disabled |
| 39. Patient educational materials |
| 40. Federal and state rules, regulations, and guidelines (e.g., FDA, ADA, HIPAA) |
| 41. ABC Facility Accreditation Standards |
| 42. General insurance workflow and protocol |
| 43. Cultural competency |
| 44. Manufacturer guidelines |
Orthotic Assistant Skill Statements |
| 1. Communicating with patient/family/caregiver |
| 2. Communicating with orthotists/prosthetists and other staff |
| 3. Identifying gross surface anatomy |
| 4. Interpretation of physical findings (e.g., recognizing skin pressures, dermatological conditions) |
| 5. Identifying normal and pathological gait/motion |
| 6. Impression-taking/measuring for orthoses/prostheses |
| 7. Use of mechanical measuring devices |
| 8. Use of electronic and computer-based measuring devices |
| 9. Patient delineation, rectification and/or patient model modification |
| 10. Orthotic/prosthetic fabrication |
| 11. Use of safety equipment |
| 12. Use of hand and power tools |
| 13. Use of materials and components |
| 14. Use of alignment devices |
| 15. Aesthetic finishing |
| 16. Evaluating fit and function of an orthosis/prosthesis |
| 17. Adjusting and modifying orthoses/prostheses |
| 18. Maintaining and repairing orthoses/prostheses |
| 19. Documentation |
| 20. Gathering quantitative and qualitative outcomes data |
| 21. Collaborating with interdisciplinary team |
Prosthetic Assistant Knowledge Statements |
| 1. General musculoskeletal anatomy, including upper limb and lower limb |
| 2. Basic neuroanatomy (e.g., major peripheral nerves of the upper and lower extremities) |
| 3. Anatomical landmarks (surface anatomy) |
| 4. Anatomical planes, planes of motion, and normal joint range of motion |
| 5. Normal human locomotion |
| 6. Gait deviations |
| 7. Tissue characteristics/management |
| 8. Volumetric control (e.g., edema, weight gain/loss) |
| 9. Biomechanics (e.g., actions of lever arms, application of force system) |
| 10. Pathologies, including cause and progression (e.g., orthopedic, neurologic, vascular) |
| 11. Medical terminology |
| 12. Referral documents |
| 13. Documentation techniques |
| 14. Policies and procedures regarding protected healthcare information |
| 15. Reimbursement protocols (e.g., CMS, Medicaid) |
| 16. Material safety procedures and standards (e.g., OSHA, SDS) |
| 17. Universal precautions, including sterile techniques and infection control |
| 18. Ethical standards regarding proper patient management, including ABC Code of Professional Responsibility |
| 19. Scopes of practice related to orthotic/prosthetic credentials |
| 20. Boundaries of the orthotic/prosthetic assistant scope of practice |
| 21. Orthotic/prosthetic design |
| 22. Orthotic/prosthetic fitting criteria |
| 23. Orthotic/prosthetic fabrication |
| 24. Clinical examination techniques |
| 25. Impression-taking techniques, materials, devices and equipment |
| 26. Rectification/modification procedures as they relate to specific orthotic/prosthetic designs |
| 27. Measurement tools and techniques |
| 28. Orthotic/prosthetic forms (e.g., assessment, orthometry, measurement, evaluation, outcomes) |
| 29. Materials science |
| 30. Componentry |
| 31. Alignment devices and techniques |
| 32. Hand and power tools |
| 33. Care and maintenance of orthoses/prostheses |
| 34. Computer-aided design and manufacturing (CAD/CAM) |
| 35. Item warranty and warranty limitations |
| 36. Research and literature |
| 37. Human development and aging, ranging from pediatric to geriatric, as they relate to prosthetic treatment |
| 38. The psychology of the disabled |
| 39. Patient educational materials |
| 40. Federal and state rules, regulations and guidelines (e.g., FDA, ADA, HIPAA) |
| 41. ABC Facility Accreditation Standards |
| 42. Manufacturer guidelines |
| 43. General insurance workflow and protocol |
| 44. Cultural competency |
Prosthetic Assistant Skill Statements |
| 1. Communicating with patient/family/caregiver |
| 2. Communicating with orthotists/prosthetists and other staff |
| 3. Identifying gross surface anatomy |
| 4. Interpretation of physical findings (e.g., recognizing skin pressures, dermatological conditions) |
| 5. Identifying normal and pathological gait/motion |
| 6. Impression-taking/measuring for orthoses/prostheses |
| 7. Use of mechanical measuring devices |
| 8. Use of electronic or computer-based measuring devices |
| 9. Patient delineation, rectification and/or patient model modification |
| 10. Orthotic/prosthetic fabrication |
| 11. Use of safety equipment |
| 12. Use of hand and power tools |
| 13. Use of materials and components |
| 14. Use of alignment devices |
| 15. Aesthetic finishing |
| 16. Evaluating fit and function of an orthosis/prosthesis |
| 17. Adjusting and modifying orthoses/prostheses |
| 18. Maintaining and repairing orthoses/prostheses |
| 19. Documentation |
| 20. Gathering quantitative and qualitative outcomes data |
| 21. Collaborating with interdisciplinary team |