Single-Use Instrumentation in Hip and Knee Replacement

What Single-Use Instrumentation Means

Traditional joint replacement is performed using heavy reusable instrument trays — cutting guides, alignment rods, sizers, and broaches — that are decontaminated, inspected, re-sterilised, and re-assembled after every case. A single hospital may cycle the same instruments through hundreds of operations.

Single-use instrumentation — also called disposable instrumentation — replaces those reusable trays with sterile, single-patient instruments delivered in sealed packaging and discarded after one use. The instruments are precision-manufactured from medical-grade materials, and because a new set is prepared for each operation, they can be matched to the implant sizes determined during pre-operative planning.

This is closely linked to patient-specific technology: when your surgery is planned from your own imaging, the instruments can be supplied to suit that plan, rather than being drawn from a generic shared tray.

Sterility and Infection Control

A new sterile set has never been used in another patient and does not depend on a hospital reprocessing cycle. Infection after joint replacement is uncommon but serious, and a proportion of contamination risk relates to the cleaning, handling, and re-sterilisation of reusable instruments. By removing the reprocessing step entirely, single-use instrumentation is designed to reduce one potential source of contamination.

It is important to be clear that no single measure eliminates infection risk. Single-use instrumentation is one layer within a broader infection-prevention strategy that also includes laminar-flow operating theatres, careful antibiotic protocols, skin preparation, and meticulous surgical technique. The value is in removing an avoidable variable rather than in any guarantee.

Precision and Consistency

Reusable instruments wear over time. Across hundreds of cases, cutting blocks lose their edge and fine tolerances can drift, and instruments are periodically reconditioned or replaced as part of normal hospital maintenance. A single-use cutting guide, by contrast, is sharp and dimensionally accurate on its first and only use.

For knee replacement in particular — where bone cuts must be precise to position the implant correctly — the condition of the instrument matters. Consistent, as-new instruments support the accuracy of each step, and pair naturally with the planning and alignment techniques Dr Liew uses, including kinematic alignment.

Single-Use Versus Traditional Reusable Trays

Both approaches can deliver a well-implanted joint, and reusable trays remain the established standard in many operating theatres. They are well understood by theatre staff, cost-efficient over a long service life, and supported by decades of use.

Single-use sets offer a different set of trade-offs. They remove the reprocessing cycle, reduce the weight and number of trays handled during a case, and arrive consistently sharp and pre-sized to the surgical plan. The trade-offs are that they generate more disposable waste and carry a different cost structure. The choice between the two reflects a surgeon's workflow and priorities rather than a simple matter of one being universally superior.

How Dr Liew Uses Single-Use Instrumentation

Dr Liew uses single-use instrumentation as part of a broader, patient-specific approach to hip and knee replacement. For knee replacement, he has used disposable instrument sets for every operation over several years, integrated with patient-specific planning and his preferred alignment technique.

This sits alongside the other elements of how he approaches surgery — from the surgical approach chosen for each patient to the materials used in the implant. None of these choices is made in isolation; together they reflect a consistent emphasis on planning each operation around the individual patient. If you would like to understand how this would apply to your own surgery, it is best discussed during a consultation.

Frequently Asked Questions