9.3 Testing of Loaner Instruments

Same Tests, Unfamiliar Instruments

Testing a loaner set is the same discipline applied to instruments you may be seeing for the first time. The IFU and the vendor's inventory sheet fill the knowledge gap; the tests themselves do not change.

---

The Test Map for a Typical Loaner Tray

---

Testing Priorities Specific to Loaners

Cutting guides and jigs

These are the highest-value test in an arthroplasty loaner because the failure is silent and consequential. A worn slot still looks like a slot. Test by:

• inspecting slot edges under magnification for belling, burring, and widening;
• checking pin holes for elongation — an oval hole means the guide will not sit where the pin puts it;
• confirming the guide mates positively with its handle, tower, or alignment rod without slop;
• confirming left/right and size markings are legible.

Any of these findings is escalated to the vendor before the case; a worn guide cannot be corrected in-house.

Powered equipment

Loaner powered equipment is run-tested exactly as in Section 8.7: connected at the manufacturer's running pressure or with a charged battery of the correct model, run in each mode, trigger and safety verified, chuck grip and release verified, and assessed for heat, noise, vibration, and exhaust discharge. Confirm the hose or cord and all attachments and keys are present and correct — loaner powered sets are frequently missing a key or an adapter.

Calibrated and torque devices

• Torque wrenches and torque-limiting drivers must be present, must operate (click or slip at the set torque), and should be accompanied by whatever calibration evidence the vendor's programme provides. A torque driver that does not release is as dangerous as one that releases early.
• Depth gauges, calipers, and rulers must have legible scales and undamaged reference surfaces.

---

Documentation of Testing

Record that testing was performed and its outcome. At minimum:

• the tray and its identifier,
• the date and the technician,
• any instrument that failed and the nature of the failure,
• the notification made to the vendor and to the OR,
• the resolution.

This record is what allows the facility to demonstrate that it processed and verified the set, and it is what supports a conversation with the vendor about a tray that repeatedly arrives with failing instruments.

---

Failure Handling

1. Do not release the instrument.
2. Notify the vendor representative immediately — most vendors can supply a replacement instrument before the case if told early.
3. Notify the OR if the failure affects the ability to perform the procedure.
4. Document the finding, the notification, and the outcome.
5. Report in writing to the vendor so the tray's condition is on record.

The time pressure that surrounds loaner sets creates real temptation to release a marginal instrument. The correct framing is the one the exam's Ethics content area uses: the question is not whether the tray is late, it is whether the instrument works. A borderline instrument released to save a delay is a decision made on behalf of a patient who was not consulted.

Prioritising When the Tray Is Large and the Time Is Short

A loaner orthopaedic set can contain several hundred items across multiple trays, and the practical question is where to concentrate testing effort. The answer is to work by clinical consequence of failure, and this is a defensible ordering you should be able to articulate.

Highest priority goes to items whose failure causes direct patient harm or an unrecoverable intraoperative problem: cutting instruments that contact bone, powered equipment, torque-limiting devices, insulated energy instruments, and anything that guides a trajectory or determines an implant size. Next come items whose failure stops the case: extraction instruments, drivers matched to specific screw heads, and the single-size components with no spare. Lowest, though still tested, are general instruments with ready substitutes elsewhere in the department.

This is a prioritisation of sequence, not of standard — everything is still tested. But when time is genuinely constrained, the escalation conversation is better informed if you can say which items have been verified.

Calibrated and Torque-Limiting Devices

These deserve separate treatment because they are common in loaner sets and cannot be verified by feel.

A torque-limiting driver or handle is designed to release at a specified value, and that value protects an implant construct from over-tightening. You cannot confirm the setting at the bench. What you can confirm is that the device releases audibly and tactilely when turned, that it is the correct device for the system, that its markings are legible, and that it carries a current calibration or service date if the manufacturer specifies one. A device that turns without releasing, or that has no legible identification, is escalated to the vendor.

The same applies to measuring devices — depth gauges, calipers, sizers, and templates. Check straightness, tip integrity, and legibility of graduations. A bent depth gauge produces a wrong screw length, and nothing downstream will catch it.

Recording Test Results and Handling Failures

Document that testing was performed and what it found, tied to the specific set and the specific case. This is the record that answers the question asked afterwards if a device fails in use.

When an item fails, remove it, tag it, and notify the vendor and the operating room immediately — the vendor may be able to supply a replacement before the case if told early enough, which is impossible if the failure is reported at the end of processing. Never return a failed loaner item to the tray with a note, and never send a failed item back into the vendor's inventory without the failure being documented, because it will simply arrive at another facility.

If a critical component fails and cannot be replaced, the set is held and the surgeon and operating room are informed so the case can be rescheduled or an alternative planned.