The aim of this study was to determine the correlation between hamstring length and gluteus maximus strength with and without normalization in patients with mechanical low back pain

seventy-three patients diagnosed as mechanical low back pain. Firstly, gluteus maximus (GM) strength was measured isometrically as a force (kg) and then converted to torque (Nm). GM strength was normalized for body weight and height using the following formula: % (body weight × h) = torque (N × m) ×100 / body weight (N) × h (m), then assessment of hamstring length flexibility using the active knee extension method.

Data was collected and the correlation was determined.

Inclusion criteria:

• Patients diagnosed as mechanical low back pain (MLBP) with very high grade mechanical inflammatory low back pain (MIL) index.
• Age ranged from 18 to 40 years.
• Body mass index ranged from 25 to 30 kg/m2

Exclusion Criteria:

• History of previous fractures, surgeries, malignancies, trauma, rheumatoid arthritis, spondylosis, and spondylolisthesis.
• History of lower limb injuries in the last six months before the study.
• Inability to correctly produce maximal Gluteus Maximus contraction in a pain-free ROM.

• Male and female patients
• Age ranged from 18-40 years
• Body mass index ranged from 25-30 kg/m2