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The Stryker knee arthrometer in clinical practice.

J B King¹, S J Kumar

¹Newham General Hospital, London, England.

The American Journal of Sports Medicine

|September 1, 1989

Summary

The Stryker knee arthrometer showed inconsistent results in a general clinic setting. Many anterior cruciate ligament deficient knees had normal measurements, questioning its diagnostic reliability with varied observers.

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Area of Science:

Orthopaedic Surgery
Medical Device Evaluation
Diagnostic Accuracy

Background:

The Stryker knee arthrometer is a device used for assessing knee laxity.
Its utility in non-specialized clinical settings with junior doctors requires evaluation.
Accurate assessment of anterior cruciate ligament (ACL) integrity is crucial for knee injury management.

Purpose of the Study:

To evaluate the performance of the Stryker knee arthrometer in a nonspecialized National Health Service (NHS) clinic.
To assess the reliability of the device when used by junior doctors in training.
To determine the diagnostic accuracy of the arthrometer for anterior cruciate ligament deficiency.

Main Methods:

The Stryker knee arthrometer was used by junior doctors in a general orthopaedic clinic.
Measurements of anterior excursion were taken on knees with and without proven anterior cruciate ligament deficiency.
Inter-observer and intra-observer reliability were assessed over three-week intervals.

Main Results:

Forty percent of knees with confirmed anterior cruciate ligament deficiency exhibited an anterior excursion of 2 mm or less.
Twenty percent of normal knees showed variability exceeding this threshold between different observers and over time.
Significant variability in measurements was observed, impacting diagnostic confidence.

Conclusions:

The Stryker knee arthrometer demonstrated questionable reliability in a general orthopaedic clinic setting.
Variability in measurements by different and the same observers raises concerns about its routine clinical use.
Further validation is needed to establish the arthrometer's utility in diverse clinical environments.

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