Below are the main rubriks (i.e strongest indications or symptoms) of Calc phos in traditional homeopathic usage, not approved by the FDA.
BACK AND NECK
Back and neck
Throbbing or jerking pains below scapula.
Violent pain in region of back when making the least effort.
Sharp pains in sacrum and coccyx.
Soreness as if separate in sacro-iliac synchondrosis.
Curvature of the spine to the left; lumbar vertebrae bend to the left; spina bifida. 21. Limbs.
Aching in all the limbs with weariness.
Pains flying about, in all parts of rump and limbs after getting wet in rain.
Extensors more affected than flexors.
Rheumatic pain and stiffness of neck with dulness of head; from slight draught of air.
Cramp-like pain in neck first one side then the other (r. to l.).
Backache and uterine pains.≡ more ...