Is Isometric Training Good for Tendon Health

I have been reading a lot about the benefits of isometrics for rehab lately. I am wondering is isometric training good for tendon health compared to traditional lifting. I have some nagging patellar tendon pain and I have heard that holding a heavy position can actually help desensitize the pain and promote collagen synthesis.

I am thinking about incorporating some isometric wall sits or leg extensions into my routine. The idea of not moving while under load sounds strange but the research seems promising. I am curious if this is something that should be done every day or if it needs more recovery time than regular eccentric work.

Has anyone here used isometrics to fix a tendon issue? I am interested in how long you held the positions and what kind of intensity you used. I want to build a solid foundation so I can get back to my heavy squats without feeling like my tendons are going to snap.