CPT Study Guide 2026
Everything you need to pass the CPT exam in one place: the exam format, every topic to study, real practice questions with explanations, flashcards, and full-length practice tests. Free, no sign-up needed.
📋 CPT Exam Format at a Glance
📚 CPT Topics to Study (21)
✍️ Sample CPT Questions & Answers
1. What is the purpose of vacuum forming in prosthetic socket fabrication?
Vacuum forming is a manufacturing process where a heated sheet of plastic material is stretched over a positive mold (the positive model of the residual limb) and then a vacuum is applied. This process pulls the softened plastic tightly against the mold, precisely shaping it to create a custom-fitting prosthetic socket.
2. Which joint primarily enables flexion and extension of the knee?
The tibiofemoral joint is the primary articulation between the tibia and the femur, forming the main part of the knee joint. This hinge joint is specifically designed to allow for the large range of motion required for flexion (bending) and extension (straightening) of the knee, which are crucial movements for walking and other activities.
3. In socket design, what does the term 'relief area' refer to?
Relief areas are intentional modifications to the socket wall that reduce pressure over bony prominences such as the fibular head or tibial crest to prevent skin breakdown.
4. A myoelectric prosthetic hand uses surface electromyography (sEMG) signals from residual limb muscles to control the hand. Which muscle pair is most commonly used for transradial myoelectric control?
The wrist flexors and wrist extensors of the residual forearm are the primary electrode sites for transradial myoelectric control, as they retain voluntary muscle function distal to the amputation.
5. What residual limb characteristic is most important when selecting the appropriate socket wall thickness during fabrication?
Socket wall thickness must match the patient's activity level and body weight to ensure structural integrity under load without adding unnecessary weight.
6. What does a quality assurance (QA) process involve in prosthetics?
A quality assurance (QA) process in prosthetics involves systematically checking and verifying that all aspects of fabrication, fitting, and repair meet established industry standards, regulatory requirements, and patient specifications. This ensures the prosthesis is safe, functional, durable, and provides the best possible outcome for the user.