you're pretty darn close, it's "coccygeal" .nm

Therapeutic Category

• Antibiotic, Oral Rinse
  
• Antibiotic, Topical

Use

  Dental:
  Antibacterial dental rinse; chlorhexidine is active against gram-positive and gram-negative organisms, facultative anaerobes, aerobes, and yeast
  Chip, for periodontal pocket insertion; indicated as an adjunct to scaling and root planing procedures for reduction of pocket depth in patients with adult periodontitis; may be used as part of a periodontal maintenance program
  Medical: Skin cleanser for surgical scrub, cleanser for skin wounds, germicidal hand rinse

Usual Dosage

Oral rinse (Peridex®)
  Precede use of solution by flossing and brushing teeth, completely rinse toothpaste from mouth; swish 15 mL undiluted oral rinse around in mouth for 30 seconds, then expectorate. Caution patient not to swallow the medicine; avoid eating for 2-3 hours after treatment. (The cap on bottle of oral rinse is a measure for 15 mL.)
  When used as a treatment of gingivitis, the regimen begins with oral prophylaxis. Patient treats mouth with 15 mL chlorhexidine; swish for 30 seconds, then expectorate; this is repeated twice daily (morning and evening). Patient should have a re-evaluation followed by a dental prophylaxis every 6 months.

Dosage Forms

  Chip, for periodontal pocket insertion (PerioChip®): 2.5 mg
  Foam, topical, with isopropyl alcohol 4% (BactoShield®): 4% (180 mL)
  Liquid, topical, with isopropyl alcohol 4%:
  Dyna-Hex® Skin Cleanser: 2% (120 mL, 240 mL, 480 mL, 960 mL, 4000 mL); 4% (120 mL, 240 mL, 480 mL, 4000 mL)
  BactoShield® 2: 2% (960 mL)
  BactoShield®, Betasept®, Exidine® Skin Cleanser, Hibiclens® Skin Cleanser: 4% (15 mL, 120 mL, 240 mL, 480 mL, 960 mL, 4000 mL)
  Rinse:
  Oral (mint flavor) (Peridex®, PerioGard®): 0.12% with alcohol 11.6% (480 mL)
  Topical (Hibistat® Hand Rinse): 0.5% with isopropyl alcohol 70% (120 mL, 240 mL)
  Sponge/Brush (Hibiclens®): 4% with isopropyl alcohol 4% (22 mL)
  Wipes (Hibistat®): 0.5% (50s)

spicule bone formation? WAG here.

There can be a wrinkle in the callus formation? All I can think of. Sorry.

Think your idea of ballottement is a good one.  Yeah, they do digital ballottment of the spine which sounds like it's done to see if it provokes discomfort somewhere else.  Don't know much else about it though.

This one is going back flagged for sure.

Thanks folks.