Why is there Lachman in my knee 2 months after ACL surgery?

Given your age and history of osteoarthritis, it is most likely caused by the wear and tear on your joints. Losing some weight gradually with a healthy diet could relieve the pressure on the knees. Additionally, physical therapy may enhance flexibility while building up muscles around these areas. 

You might have costochondritis. This is when the cartilage in your ribs gets inflamed, which usually causes pain and tenderness. It may be related to weight loss and sometimes comes on after an illness. To help relieve the pain, you can do some gentle stretching, use heat packs, or take over-the-counter painkillers such as ibuprofen.

Arthritis, carpal tunnel syndrome or injury may lead to pain in hand fingers. It is advisable to consult an orthopedic physician for proper diagnosis and treatment. Failing to address the pain may make things worse and interfere with everyday life.

Thigh pain can be due to various reasons such as muscle strain, overuse, or even bad posture. Sometimes, you're sitting for too long, and you'll feel your thighs are hurting. Alongside this issue is that you are sitting for a long time and your thighs hurt. Do some light stretching, and apply heat to the affected area. Be active and avoid long periods of sitting down to allow them to feel well.