TABLE V.
Analysis of Temporal Relationship of Tear Enlargement and Progression of Muscle Degeneration
| Variable Description | No. | Time from Tear Enlargement to Progression of Muscle Degeneration in Supraspinatus* (yr) | No. | Time from Tear Enlargement to Progression of Muscle Degeneration in Infraspinatus* (yr) | P Value† |
| Using 1st tear enlargement event | NA | ||||
| Progression of muscle degeneration after tear enlargement | 21 | 2.0 (1.8; 0.6 to 6.9) | 20 | 3.1 (2.6; 0.6 to 8.5) | |
| Simultaneous progression of muscle degeneration and enlargement | 6 | 0.0 (0.0) | 7 | 0.0 (0.0) | |
| Progression of muscle degeneration before tear enlargement | 7 | 1.0 (1.0; 0.5 to 2.0) | 6 | 0.9 (0.4; 0.5 to 1.8) | |
| No progression of degeneration in the specific muscle | 11 | NA | 12 | NA | |
| Muscle‡ | |||||
| All tears with progression of muscle degeneration and tear enlargement | 34 | 1.0 (2.1; −2.0 to 6.9) | 33 | 1.1 (3.2; −1.8 to 8.5) | 0.98§ |
| Tears with progression of degeneration in a single muscle and enlargement | 12 | 1.4 (2.6; −2.0 to 4.6) | 11 | 3.1 (4.9; 0.0 to 5.4) | 0.10# |
The values are given as the median, with the interquartile range and the minimum and maximum measurements in parentheses. NA = not applicable. Progression was defined for each muscle separately. Tears with progression of the supraspinatus only or both the supraspinatus and infraspinatus were classified as having supraspinatus progression. Tears with progression of the infraspinatus only or both the supraspinatus and infraspinatus were classified as having infraspinatus progression.
NA = not applicable.
Tears with muscle degeneration progression before the 1st tear enlargement are reported with a negative time. Tears with muscle degeneration progression after the 1st tear enlargement are reported with a positive time. Tears with simultaneous progression of muscle degeneration and 1st tear enlargement are reported with a zero time.
P value is for the comparison of the supraspinatus and the infraspinatus muscle by generalized estimating equations.
P value is for the comparison of the supraspinatus and the infraspinatus muscle according to the Wilcoxon 2-sample test.