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Association Between Isokinetic Lower Extremity Muscle Strength and Bone Mineral Density in Elderly Women With and
Azza M Abdelmohsen1, Omaima E Saleh1
1Department of Biomechanics, Faculty of Physical Therapy, Cairo University, Giza, Egypt.
Objective:
The purpose of this study was to explore the relationship between isokinetic hip and knee muscle strength and bone mineral density (BMD) in elderly women with osteoporosis (OP).
Methods:
The study included 66 elderly women: 33 with OP (case group A) and 33 healthy controls (control group B). BMD at the femoral head was assessed using Dual Energy X-ray Absorptiometry (DEXA). Isokinetic muscle strength of the hip (flexors, extensors, abductors, adductors) and knee (flexors, extensors) was measured using the Biodex System 3 Isokinetic Dynamometer at 60°/sec in concentric mode, with 5 repetitions.
Results:
The analysis revealed significantly lower strength in all hip muscles in women with OP compared to controls (p < .05). Meanwhile, no significant differences were observed in knee muscle strength between the 2 groups. The findings suggest that reductions in BMD are more closely associated with decreased hip muscle strength than with knee muscle strength.
Conclusion:
Diminished isokinetic strength of hip muscles is more strongly linked to BMD reduction in elderly women with OP. Low BMD may serve as a risk factor for lower extremity muscle weakness, emphasizing the need to focus on hip muscle strength in this population.
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