The bony apprehension test for instability of the shoulder: a prospective pilot analysis.
OBJECTIVE
We performed a prospective pilot study of the "bony apprehension test," in which apprehension is experienced at or below 45 degrees of abduction and 45 degrees of external rotation, as a means of screening for a significant bony lesion causing instability of the shoulder.


METHODS
Over a 1-year period, 29 consecutive cases of symptomatic shoulder instability were examined with the bony apprehension test and treated with surgery. Findings at arthroscopy were used as the definitive diagnostic data point. This information was compared with the results of the test and with the results of the preoperative plain radiographs.


RESULTS
There were 8 cases involving significant bony lesions and 21 cases involving only soft-tissue lesions. The bony apprehension test was positive in all 8 patients in the bony lesion group and in 3 of 21 patients in the soft-tissue lesion group, representing a sensitivity of 100%, specificity of 86%, positive predictive value of 73%, and negative predictive value of 100%. Preoperative radiographs were positive in 4 patients in the bony lesion group only, representing a sensitivity of 50%, specificity of 100%, positive predictive value of 100%, and negative predictive value of 84%.


CONCLUSIONS
The bony apprehension test can reliably screen for significant osseous lesions. In this study it was more sensitive than plain radiographs, as shown by a higher sensitivity for the test (100%) than for preoperative plain radiographs (50%).


METHODS
Level II, development of diagnostic criteria based on consecutive patients with universally applied gold standard.
Bushnell
Brandon D
BD
Department of Orthopaedic Surgery, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA. bbushnell@shcdenver.com
Creighton
R Alex
RA
Herring
Marion M
MM