If you find yourself constantly reaching into high or low places, or if you have bad knees, the EZ reacher might just be the thing to prevent low back strain. I originally found this on Cool Tools, which gave it a favorable review for durability and ease of use. It might be the perfect thing to give an inflamed knee or back time to heal, especially after a surgery.
At Amazon for $17
If you are looking for a great space saver for your home gym, you might consider these adjustable ‘click’ weights instead of purchasing a full set of dumbbells. Pictured is a pair of 12.5lb dumbbells which adjusts in 2.5lb increments. If you desire heavier weights the same thing is available as one Reebok Speed Pac 25-Pound Adjustable Single Dumbbell that adjusts at 5lb increments. There are several higher end brands(Powerblock & Stamina) which cost a lot more(>$150), but I found these at Target for $50.
Note: Adjustable ankle weights may be more appropriate for those with wrist/forearm injuries