Celtics jerseys 1989-90 questions??

[33bird]

I know they wore a black band on the left shoulder for somebody this season. 2 questions:
For Whom?
And did they wear those for the WHOLE season?
Let us know what you know please. Thanks,
Greg
biggamebird@yahoo.com

[33bird]

Here's a few photos of the black band on some jerseys that year.