Hi D9401,
As you know from reading the tutorial the first “rule” of mattress shopping is to remember that you are the only one that can feel what you feel on a mattress and there are too many unknowns, variables, and personal preferences involved that are unique to each person to use a formula or for anyone to be able to predict or make a specific suggestion or recommendation about which mattress or combination of materials and components or which type of mattress would be the best “match” for you in terms of “comfort” or PPP (Posture and alignment, Pressure relief, and your Personal preferences) or how a mattress will “feel” to you or compare to another mattress based on specs (either yours or a mattress) or “theory at a distance” that can possibly be more accurate than your own careful testing (hopefully using the testing guidelines in step 4 of the tutorial) or your own personal sleeping experience (see mattress firmness/comfort levels in post #2 here).
Two of the most important links in the tutorial that I would especially make sure you read are post #2 here which has more about the different ways to choose a suitable mattress (either locally or online) that is the best “match” for you in terms of “comfort” and PPP (Posture and alignment, Pressure relief, and Personal preferences) that can help you assess and minimize the risks of making a choice that doesn’t turn out as well as you hoped for and post #13 here which has more about the most important parts of the “value” of a mattress purchase which can help you make more meaningful quality/value comparisons between mattresses in terms of suitability (how well you will sleep), durability (how long you will sleep well), and the overall value of a mattress compared to your other finalists (based on all the parts of your personal value equation that are most important to you).
There isn’t any specific mattress that is “best” for any specific medical conditions in general since each person is unique and a mattress that would work well for one person with certain medical issues may be completely unsuitable for someone else with similar medical issues to sleep on. There is only a mattress that is a good match for “you” in terms of PPP (Posture and alignment, Pressure relief, and your Personal preferences) regardless of whether the same mattress would work well for anyone else.
There are also some suggestions in this topic that may be helpful with rotator cuff issues as well.
As you also hopefully know from reading the tutorial and the guidelines here … I would avoid the major brands such as Serta, Sealy, and Simmons and the stores that tend to focus on them along with any mattress where you aren’t able to find out the information you need about the type and quality of the materials inside it to make an informed choice (see this article) or any mattress that uses lower quality materials than the suggestions in the quality/durability guidelines here so you can avoid buying a mattress that will soften or break down and need to be replaced much too quickly relative to the price you paid.
If you let me know your city or zip code I’d be happy to let you know about any of the better options or possibilities I’m aware of in your area.
Phoenix