CO common mistakes
CO · Understand the traps and how to avoid them.
Choosing the level of amputation or componentry before completing a structured patient-assessment sequence (history, vascular/neurologic status, skin integrity, contralateral limb, functional and psychosocial status).
Candidates jump to a familiar device recipe because they recognize the diagnosis and feel time pressure, so they anchor on the first plausible answer instead of building a defensible assessment.
What to do instead
Before answering any plan-related item, write a one-line assessment summary listing the key findings that constrain the choice (e.g., vascular supply, skin condition, cognition, home environment), then eliminate options that conflict with those findings.
Confusing preoperative versus postoperative and early versus definitive prosthetic timelines, or missing that a preparatory prosthesis precedes a definitive one.
Textbook phases blur together and candidates memorize component names without attaching them to the care phase in which they are used.
What to do instead
Build a timeline card (pre-op, immediate post-op, early post-op/preparatory, definitive) and for each phase list allowed device type, expected goals, and contraindications; test yourself by naming the phase from a scenario before choosing an answer.
Selecting a socket design or suspension method without matching it to residual-limb length, shape, soft-tissue coverage, and volume stability.
Candidates gravitate to the newest or most familiar suspension system rather than reasoning from limb characteristics and patient factors.
What to do instead
Practice a matching matrix: for each limb presentation (short, bony, redundant soft tissue, volume-fluctuating, sensitive distal end), state which suspension and socket design is favored and why; justify each choice in one sentence.
Treating measurement and casting/scanning as a rote step and omitting key landmarks, weight-bearing status, or the distinction between hand-cast and CAD workflows.
Under time pressure candidates skip the rationale behind each measurement and cannot explain what a given measurement is used to control in the final device.
What to do instead
For every measurement or scan step, state what design parameter it drives (e.g., M-L dimension affects socket width and pressure distribution); practice explaining the purpose of each landmark aloud.
Skipping bench alignment and static/dynamic alignment checks, or failing to distinguish bench, static, and dynamic alignment problems.
Candidates conflate the three alignment stages and cannot map a gait deviation to the correct stage or adjustment.
What to do instead
Create a three-column table (bench, static, dynamic) with the observations and adjustments appropriate to each; rehearse mapping common deviations (e.g., excessive knee flexion, lateral lean) to the correct stage and correction.
Ignoring fabrication tolerances and modification decisions (e.g., reliefs, buildups, trim lines) when answering questions about fit or comfort problems.
Candidates focus on the final fitting and forget that most fit problems originate in the positive model or modification stage.
What to do instead
For each common fit complaint, trace it back to a fabrication or modification cause before considering a fitting-stage fix; practice identifying whether the error is in the model, the modification, or the assembly.
Delivering a device without a documented check-out: verifying suspension, alignment, donning/doffing, skin inspection, and functional training before discharge.
Candidates treat delivery as the endpoint and omit the structured verification and education steps that belong to delivery.
What to do instead
Memorize a delivery checklist (suspension integrity, alignment, donning/doffing, skin check, wear schedule, warning signs, follow-up) and answer delivery items by checking which checklist element is missing.
Recommending a follow-up or maintenance interval without tying it to the patient's activity level, limb volume changes, or growth stage.
Candidates default to a single generic interval instead of reasoning from individual risk factors.
What to do instead
Practice assigning follow-up frequency from patient-specific factors (new amputee, pediatric growth, high activity, vascular compromise) and state the rationale; flag any option that ignores patient-specific risk.
Overlooking scope-of-practice, informed consent, documentation, and conflict-of-interest obligations when answering ethics or practice-management items.
Candidates answer from a clinical or business instinct rather than from professional standards and legal duties.
What to do instead
Review the governing scope-of-practice and ethical standards, then for each scenario ask: who is authorized, what must be documented, what must be disclosed, and is there a conflict of interest before selecting an answer.
Failing to link outcome measures (functional, satisfaction, and quality-of-life tools) to the treatment plan and to use them to justify modification or replacement.
Candidates treat outcome measurement as an optional add-on rather than the evidence that drives plan revision.
What to do instead
For each major outcome domain, name one instrument and state how a poor score would change the plan (e.g., trigger a socket modification or referral); practice answering outcome items by identifying which measure and which decision it informs.