Przejdź do treściA positive test during an orthopaedic examination is not a diagnosis by itself. It means that a particular movement, pressure or load produced the response the test was designed to provoke. Its real significance becomes clear only when it is interpreted alongside the history, the rest of the examination and, when appropriate, imaging.
What is a provocative test?
During an orthopaedic examination, the clinician deliberately positions a joint or loads a selected structure to see whether this reproduces familiar pain, instability, loss of motion or a neurological symptom. A test may be aimed at a tendon, ligament, meniscus, labrum, nerve or a particular direction of movement.
The answer is not simply “painful” or “not painful”. The exact location and character of the symptom matter, as do side-to-side differences, end-feel, strength, range of motion and whether the manoeuvre reproduces the pain the patient actually recognises from everyday activities.
Why can a test be positive without the suspected injury?
A single movement often stresses several structures at the same time. A manoeuvre intended to assess a tendon may also tension the joint capsule, compress a bursa or provoke pain arising from a neighbouring area. A positive response can therefore come from a different source than the name of the test suggests.
Tissue irritability, a recent injury, swelling, fear of movement and the way the test is performed can also affect the result. This is why a test is most useful when it answers a specific question generated by the history rather than when it is used as one item in a long, untargeted checklist.
Sensitivity, specificity and pre-test probability
Some tests are good at detecting a problem but also become positive in many people who do not have the condition. Others are more convincing when positive but can miss a proportion of genuine injuries. These characteristics are described, among other measures, by sensitivity and specificity.
The same positive finding has a different meaning after a typical injury with characteristic symptoms than it does in a person with diffuse pain and no clear injury mechanism. The clinician first estimates how likely a diagnosis is from the history and then updates that probability using the examination findings. A test never exists independently of the person being examined and the clinical question being asked.
Why does an orthopaedic surgeon often use several tests?
Different manoeuvres may examine different aspects of the same structure or help distinguish between several similar causes of pain. A coherent pattern of findings is usually more informative than one isolated positive test. What the examination does not provoke may be just as important.
For example, shoulder pain during arm elevation may arise from the rotator cuff, the long head of biceps tendon, the acromioclavicular joint, a stiff capsule or the cervical spine. Comparing active and passive movement, strength, tenderness and the response to several manoeuvres helps organise those findings into a clinically meaningful pattern.
Does a positive test always mean an MRI is needed?
No. Imaging is useful when it answers an unresolved question or may change management. Sometimes an X-ray is the right next step, sometimes ultrasound, sometimes MRI, and sometimes no immediate imaging is required. In selected situations, initial non-operative treatment and reassessment may be appropriate, particularly when there are no warning signs.
Conversely, one negative test does not always exclude an injury. If the mechanism, loss of function or progressive symptoms remain concerning, further assessment may still be needed despite a negative manoeuvre.
What can the patient contribute?
It is helpful to say whether a test reproduced exactly the familiar symptom or merely caused pressure-related discomfort. It also helps to describe what happens afterwards: whether the pain resolves immediately, persists, radiates or is accompanied by numbness or weakness.
An orthopaedic examination is a process of comparing pieces of information, not a search for one decisive “positive test”. The best interpretation comes from the pattern formed by history, examination and, when needed, targeted imaging.
References
- Bossuyt PM, Reitsma JB, Bruns DE, et al. STARD 2015: an updated list of essential items for reporting diagnostic accuracy studies. BMJ. 2015;351:h5527. DOI: 10.1136/bmj.h5527.
- McGee S. Simplifying likelihood ratios. Journal of General Internal Medicine. 2002;17(8):646–649. PubMed.
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Content prepared by: Tomasz Poboży - orthopaedic surgeon.