Psoas major IMF (left)
Bone and muscle healthFat infiltration measurement in the left psoas major muscle, which connects the lumbar spine to the femur and is essential for hip flexion.
Higher IMF values typically indicate poorer muscle quality.
Why this matters
Higher levels of intramuscular fat in your deep hip flexor muscles can indicate deterioration in muscle quality, which can cause deep groin or lower back pain, difficulty lifting the legs, and postural changes. Left-right imbalances in these hip flexors can create asymmetric movement patterns and contribute to compensatory strain on the spine and pelvis. Fat infiltration often develops from prolonged inactivity, lack of exercise, or previous muscle injuries. Weak psoas muscles increase fall risk in older adults due to reduced leg lifting ability.
Unlike subcutaneous fat you can lose through diet, reducing intramuscular fat requires targeted exercise to rebuild muscle quality. This is a research-based wellness measurement for tracking muscle health.
How this connects to other biomarkers
- Psoas IMF reflects fatty infiltration of a key hip flexor and core stabilizer; elevations are associated with reduced hip mobility and falls in older adults.
- Interpret alongside the contralateral side (Psoas major IMF (right)); asymmetry can flag unilateral pathology (psoas bleed, hernia, prior surgery).
- Elevated psoas IMF combined with high MFI thighs and high VAT to SAT Ratio signals advanced sarcopenic obesity.
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