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Elderly woman — hip fracture after trivial fall; DEXA -3.0; osteoporosis; bisphosphonate. Osteoporosis (low bone mass — postmenopausal women — estrogen loss: silent — fragility fractures — hip, wrist, spine — minimal trauma: DEXA — T-score ≤−2.5; treat — calcium, vitamin D, bisphosphonates — alendronate; exercise — weight-bearing; prevent — smoking/alcohol): rickets/osteomalacia (vitamin D deficiency — children — rickets — bow legs; adults — osteomalacia — bone pain, Looser's zones — pseudofractures: treat — vitamin D + calcium; sunlight). The trivial-trauma fracture is osteoporosis — DEXA confirms.