Welcome to the forum.
If the spine curves in an unusual way the patient is more likely to experience back pain
. An example is scoliosis
, when the spine curves to the side. Finger locking might be due to trigger finger
for this . I would suggest getting this evaluated by an orthopedician for an accurate diagnosis and appropriate management. You may get the X-ray/MRI of spine under his/her guidance.
I hope this information has been both informative and helpful for you