Why does significant muscle sarcopenia increase the risk of hip fractures, even when bone density, measured via DXA, remains relatively stable in an elderly patient?

💡 Explanation

Sarcopenia reduces muscle mass; because muscles normally absorb a portion of impact during falls, their atrophy increases the force transmitted to bones. Therefore, fracture risk rises disproportionately, rather than merely being a function of bone density alone.

• If a person's suprachiasmatic nucleus (SCN) neurons have a mutation that shortens their intrinsic firing period to 22 hours, which consequence follows for their sleep patterns?
• Why does applying topical corticosteroids to damaged skin increase the risk of secondary bacterial infections?
• Why does the renal countercurrent multiplier system require the vasa recta?
• If an asthma patient inhales pollen, which consequence follows regarding airway smooth muscle?
• If intense, prolonged exercise leads to increased oxidative stress within muscle fibers, which consequence most likely hinders long-term muscle development?
• During forceful muscle contraction, what distinguishes the behavior of myosin heads in slow-twitch (Type I) fibers from those in fast-twitch (Type IIx) fibers under conditions of ATP depletion?