Acronyms, abbreviations & word meanings

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Across
  1. 2. Hx
  2. 4. LBP
  3. 5. +++ is an indication of ________
  4. 7. ?
  5. 8. PMHx
  6. 10. intra
  7. 13. Dx
  8. 14. ROM
  9. 16. #
  10. 17. AA
  11. 18. 3/12
Down
  1. 1. OA
  2. 3. PA
  3. 6. cephalic
  4. 9. MVA
  5. 11. peri
  6. 12. SIJ
  7. 15. 2/7