For quite a long time, my mum went to a chiropractor, just for a 15 to a 25-minute session every 2 weeks. it cost £30 a time, but it made one hell of a difference to my mum's walking ability for quite some time.
At one time he noticed that my mum was beginning to have more than the usual kind of muscle problems etc, and did a few weekly visits to try and combat it. He then suggested that my mum should go to the doctor and suggest that perhaps she needed to have her hip looked at since it could need a replacement. She went through the usual procedure and nothing stuck out as being particularly bad with her hip. It didn't seem to be improving, so he suggested that it could be an idea for her to pay privately to get a second opinion from a specialist who dealt with joints problems. We knew him by now. trusted his opinion, and decided it would be worth at least going to get a second opinion even if it was pretty expensive.
Sure enough, the specialist not only noticed that she had a severe hip problem and would need a new hip, but that she also had a severe knee problem on the other leg as well. He then wrote a referral for my mum to take to her normal doctor, who could use that to have my mum shot up the list to have both things done on the NHS as it should be classed as a priority. Soon as possible after her hip was replaced and had recovered, she was sent to have her knee replaced.
My mum's walking did start to deteriorate pretty quickly over the last year, but she is going to be 96 next month. Prior to that she was still walking a lot.