• MRI
  • Computed tomography
  • Breast diagnostics
  • Therapy
  • Nuclear medicine
  • Other

Typical patterns of affection

Bone density measurement - Typical patterns of affection

Classification of the primary osteoporoses:

Depending on the cause, a distinction is made between two main causes (types) of osteoporosis.

  • Type I osteoporosis (postmenopausal)
  • Type II osteoporosis (senile osteoporosis)

Typical patterns of affection exist for both types.

In the case of postmenopausal osteoporosis the affection takes place mainly in the bones of the trunk.
In the case of senile osteoporosis the affection takes place both in the bones of the trunk and in the periphery (around the neck of the femur – cause of the frequent fractures of the neck of the femur in advanced age).

The patients today still mainly interpret the bone density measurements according to the percentage age comparison (100 % would be ideal here, e.g. 65 % would mean significant osteoporosis compared to the age group). However, the classification of the WHO for assessing the severity of osteoporosis is currently employed worldwide. What is decisive here is the so-called t value (standard deviation compared to the average value for young adults – time of greatest bone density).

Classification of the severity of the bone density in the case of DPX (or DXA) according to WHO (t value)

Normal findings: Bone density or bone mineral content no longer as a standard deviation (below the average value for young adults).

Reduced bone mass (osteopenia):Bone density or bone mineral content -1 to -2.5 standard deviations (below the average value for young adults)

Osteoporosis (calculational):Bone density or bone mineral content more than -2.5 standard deviations (below the average value for young adults)

Severe (established) osteoporosis: Bone density or bone mineral content more than -2.5 standard deviations (below the average value for young adults) with existing fragility fractures

Typical patterns of affection

Further information on bone density measurement