McMurray test

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I have a 31# dog who is 3 weeks out on a lateral suture repair for a torn ACL.

He had been doing great - > 50 % WB at 2 weeks! Today he came in toe touching

lame on the leg - occurred acutely several days ago. His owner came home and

found him that way. On exam he has no drawer. He really resists extension of

the knee. I can feel a slight pop medially at the joint line near the end of

extension. He does not show more pain when I'm feeling the pop. I did the

McMurray test and he has some pain on extension with internal rotation ( about

the same as normal extension) and has a empty end feel with extension and

external rotation.

Questions: Am I right in thinking that I am testing the caudal pole of the

lateral meniscus when I am rotating externally?

If so does it sound like this is a mensicle tear? I feel a small pop medially

(no sound) but only get the empty end feel with external rotation.

If this doesn't sound like a meniscus any other thoughts on what might be going

on?

Thanks for any help.

Falch, DVM