¿Por qué tengo dolor intenso en la espalda baja y en las piernas?

The maximum lengthening achievable is around 8-10 cm for the femur bone and 6-8 cm for the tibia bone. The amount of limb lengthening a person can gain through surgery varies according to the individual's initial height, the type of surgery, desired lengthening etc.

It appears that you have recently been having some lower back pain as well as muscle pulls. These could be due to things like bad posture, overworking yourself or even just pulling a muscle while making a sudden move. To reduce your discomfort, try doing some gentle stretches, using warm packs, and resting when necessary. 

I'M sorry to hear about your son's injury . First, stop any bleeding with gentle pressure.... Apply a cold compress to reduce swelling.. Visit a doctor to rule out any broken bones. Follow any instructions for medication and rest. Avoid putting weight on the INJURED leg. MonitoR for signs of infection, like REDNESS or fever. Contact the doctor if symptoms worsen or persist....

Accidentally cutting a te­ndon that moves your wrist means trouble ge­tting it to bend or straighten. An injury or surgery could cause­ this. The symptoms? Difficulty bending or making your wrist flat. To fix it, surgery re­connects the tendon e­nds. But after, physical therapy helps re­gain wrist movement.

Wearing diapers at night can cause you knee pain, so it's better to avoid it. When you are experiencing knee pain, your mobility is restricted which makes it hard for you to sleep. However, wearing diapers will not help. Knee issues arise either because of injury, arthritis, or muscle strain. To help, use pillows to support your knees while sleeping and also do gentle doctor-recommended exercises to strengthen your knee. Instead of only treating the pain, you should focus on the cause of the knee problem.

The injury that you have described might be a muscle strain or a cervical nerve compression. You should consult an orthopedic doctor or a neurologist for proper diagnosis and therapy. If the pain lasts or increases, do not ignore it.