I suggest that you see your orthopedic surgeon right away. Lachman is the presence of a failed surgery or weak muscles. Kindly do not waste time and contact the surgeon who operated you through ACL surgery. 

You seem to have back pain and trouble bending. It could result from any number of factors, such as a muscle strain or back trauma. To correctly be diagnosed and treated for your condition, I would suggest that you visit an orthopedic physician.

It’s common to experience back pain in your age group because of several factors. It may be due to rapid growth or carrying a heavy backpack. Some indications for this condition may include tenderness, rigidity, or uneasiness. To solve this problem, don’t carry heavy bags and do exercises that will tighten your muscles. Also, be mindful of how you sit or stand. If the discomfort persists then it would be wise to inform an adult about it.

Joint pain after unprote­cted sex is concerning. It could signal a se­xually transmitted infection (STI). Common symptoms include discomfort, swe­lling, and stiffness in the joints. Getting te­sted for STIs is crucial to identify any potential infe­ctions. Moving forward, practice safe sex consiste­ntly. 

Your uric acid level of 10.7 is quite high and can cause severe pain, especially in the feet, which is often a sign of gout. It’s important to avoid foods high in purines like red meat and seafood and drink plenty of water. Visit a rheumatologist, who specializes in treating gout and joint-related conditions, for proper treatment and guidance.

If you are experiencing lower abdomen pain while doing perineal exercises, it may be because you are overexerting yourself or performing the exercises incorrectly. Consult a physical therapist to assess your technique and ensure that you are performing the exercises safely.