Bone mineral density loss after combat-related lower extremity amputation

Area of Science:

• Orthopedics
• Traumatology
• Bone Metabolism

Background:

• Combat-related lower extremity amputations present unique challenges for long-term patient health.
• Low bone mineral density (BMD) is a potential complication following amputation, impacting recovery and quality of life.

Purpose of the Study:

• To determine the incidence, severity, and risk factors for low BMD in patients with combat-related lower extremity amputations.

Main Methods:

• A retrospective case-control study was conducted at a tertiary care military treatment facility.
• 156 lower extremity amputees (182 amputations) underwent dual energy x-ray absorptiometry (DXA) scanning.
• Multivariate analysis identified risk factors associated with low BMD (Z score < -1.0).

Main Results:

• The incidence of low BMD was 42% among the study population.
• Significant risk factors for low BMD included prolonged time to first ambulation (OR=1.39), delayed DXA scanning (OR=1.10), and more proximal amputation level (OR=7.27).
• Bilateral amputees had significantly lower average Z scores compared to unilateral amputees (P=0.005).

Conclusions:

• Proximal amputation level and delayed ambulation are significantly associated with low BMD post-trauma.
• Transfemoral amputees are at higher risk, with disuse atrophy being a primary contributing factor.
• Early, aggressive weight-bearing rehabilitation and adequate calcium/vitamin D supplementation are recommended for prevention.