Hi!
In the past, some guys at my club (me including) had problems with the biceps tendon from learning the cross. And that eventhough all of them could do a rings handstand and a planche, at least straddled, at that time.
All of them, me including, were quite young when they learned the cross, about 14-15 years old. So, we thought, that our tendons might be just not strong enough because we were in puberty and were still growing.
That's why we decided to wait with crosses until the gymnast isn't in puberty anymore, so at least 16 or older. For myself it worked, I'm 16 now and started doing crosses again, and I can hold it now without any problems or pain.
Now, we have a very strong athlete who's 13 and a half at the moment. His overall strength is impressive, especially his planche is really strong. But, we don't want to start working crosses with him, because we are worried that he could also get problems with his tendons and joints.
Now we were thinking about teaching him a maltese instead, which might take a lot longer than a cross, but might be healthier because the pressure on the tendons is not as high as with the cross.
What do you think? Is a Maltese less demanding for the tendons and joints?