Bone mineral density in patients with ossification of the posterior longitudinal ligament. Minimal decrease of bone...

Area of Science:

• Orthopedics and Rheumatology
• Bone Metabolism Research
• Spinal Disorders

Background:

• The role of bone mineral density (BMD) in ossification of the posterior longitudinal ligament (OPLL) is not fully understood.
• Investigating BMD in non-spinal areas could reveal systemic factors in OPLL pathogenesis.
• Age-related changes in BMD necessitate consideration when evaluating OPLL patients.

Purpose of the Study:

• To compare BMD in individuals with and without OPLL in non-spinal body regions.
• To examine the relationship between BMD and age in patients diagnosed with OPLL.

Main Methods:

• Dual-energy x-ray absorptiometry (DXA) was used to measure BMD.
• BMD was assessed in the rib, upper limb, and lower limb areas of 45 men with cervical spine OPLL and 25 healthy controls.
• Statistical analysis compared BMD between the OPLL and normal groups, and evaluated age-related BMD changes.

Main Results:

• BMD was elevated in the OPLL group across all measured non-spinal areas.
• Significant BMD increases were observed in the rib (P < 0.01) and lower limb (P < 0.05) regions.
• The age-related decline in BMD was significantly attenuated in the OPLL group for the rib (P < 0.01), upper limb (P < 0.05), and lower limb (P < 0.01) areas.

Conclusions:

• Systemic factors contributing to increased BMD appear to play a role in OPLL development.
• These bone-metabolism-influencing factors may become more active after middle age.
• Findings support a systemic basis for OPLL, potentially linked to heightened bone formation processes.