Part I (Written) Examination: Foundations and High-Yield Traps
What the written exam rewards
The Part I examination tests breadth of recall plus the ability to apply classification systems under time pressure. Organize study around anatomy and surgical approaches, biomechanics, pathophysiology of fracture healing, pediatric growth concepts (physis zones, remodeling potential, Salter-Harris), and basic science of implants (working length, stress risers, materials). Expect image-free stems that ask you to choose the single best answer; the discriminator is usually a definition or a threshold, not obscure trivia.
Concepts you must own
- Fracture healing: primary (direct) versus secondary (callus) healing; the roles of stability, gap size, and blood supply.
- Classification logic: AO/OTA principles, Salter-Harris, Garden, Neer, and similar systems - know what each system is meant to predict.
- Neurovascular anatomy: named nerves at risk in standard exposures and the compartments they traverse.
- Biomechanics: bending versus torsion versus shear, and how implant choice maps to the loading mode.
Traps that recur
Questions often hinge on a single word: "most likely," "initial," "absolute," or "contraindicated." Distractors are frequently true statements that answer a different question. Pediatric stems tempt you toward adult thresholds; growth-plate questions tempt you toward naming the fracture rather than predicting growth disturbance. Implant questions tempt you toward the strongest construct rather than the one matching the biomechanical goal.
Rule of thumb
When two answers are both plausible, ask: what does the stem actually ask me to predict? Choose the option that changes management. For pediatric physeal injuries, remember the Salter-Harris I–V mnemonic (Slipped, Above, Below, Through, Crush) and that higher grades and articular involvement raise the risk of growth arrest.
Worked example
A stem describes a torsional load producing a spiral fracture. Bending loads produce transverse fractures; torsion produces spiral patterns. Recognizing the loading mode → fracture pattern link eliminates distractors quickly.