Neer's test targets subacromial impingement by reproducing compression of structures under the acromion as the arm is elevating. By stabilizing the scapula and passively lifting the arm into forward elevation (often with internal rotation), the humeral head is pressed upward into the undersurface of the acromion, narrowing the subacromial space. If the rotator cuff tendons and the subacromial bursa are irritated, this maneuver provokes pain, indicating impingement. This isn’t about rough tests of shoulder joint stability, which rely on different maneuvers that assess the glenohumeral joint, nor is it a strength test for the rotator cuff (that would involve resisted abduction). It also isn’t a test for adhesive capsulitis, which typically presents with a broader, capsular pattern of motion loss rather than focal impingement pain.

After hip surgery, preventing dislocation focuses on avoiding positions that push the femoral head out of the socket. Limiting hip flexion to 90 degrees or less is a common and effective restriction because bending the hip beyond that point places the femoral head at the back of the acetabulum, increasing the risk of dislocation—especially with a posterior surgical approach. Other movements mentioned don’t place the hip in a position that directly threatens the joint in the same way: knee bending or ankle movement don’t control the hip dislocation risk, and while hip abduction can be monitored, it isn’t the universal precaution used to prevent dislocation. So, keeping hip flexion under 90 degrees best reduces the chance of dislocation after surgery.

When a symptom-limited test is being performed, patient safety depends on continuous, reliable ECG and blood pressure monitoring to detect dangerous responses in real time. If the monitoring is unreliable due to technical problems, you cannot confidently identify ischemia, arrhythmias, or dangerous BP changes. Proceeding under uncertain data could miss a critical event, so the correct action is to stop the test and fix the monitoring issues, or terminate and reschedule if the problem can’t be resolved promptly. Continuing with unreliable or substituting guesswork isn’t acceptable, and disconnecting equipment to proceed would bypass essential safety checks. Ignoring the monitoring and pushing ahead is similarly unsafe.

Post-exercise monitoring in MG centers on how the muscles respond to activity. Myasthenia gravis causes fatigable weakness, which typically worsens after use. Watching for changes in muscle performance and any new or increased muscle or joint pain helps identify overexertion and how well rest and pacing are working to prevent a drop in strength. The other factors listed—blood pressure changes, sleep quality, or nausea—are less directly tied to how MG muscles handle post-exercise, so muscle and joint pain is the most relevant signal to watch.