A Common but Flawed Assumption
It is tempting to treat a negative special test — say, a negative impingement test at the shoulder — as confidently ruling out the condition it is designed to detect. For many orthopaedic special tests, this assumption is not well supported by the evidence.
Sensitivity: What a Test Is Actually Good For
A test's sensitivity describes how reliably it identifies people who truly have the condition (how few true cases it misses); a highly sensitive test, when negative, is genuinely useful for ruling a condition out. The problem is that a large systematic review and meta-analysis of commonly used shoulder special tests found that many widely used tests have only modest sensitivity, meaning a meaningful proportion of people who do have the underlying pathology will still test negative (Hegedus et al., 2012).
Why This Argues for Clusters, Not Single Tests
Because few individual special tests have the statistical properties needed to confidently rule a condition in or out on their own, current best practice relies on combining several tests into a cluster alongside the patient's history and movement pattern, rather than treating any single negative test result as conclusive.
References & Further Reading
- Hegedus EJ, Goode AP, Cook CE, et al. Which physical examination tests provide clinicians with the most value when examining the shoulder? Update of a systematic review with meta-analysis of individual tests. Br J Sports Med. 2012;46(14):964-978.