Osteosynthesis in Sarcopenic Fractures

Sarcopenia (age-related progressive loss of skeletal muscle mass and function) frequently coexists with osteoporosis (low bone mass) creating osteosarcopenia, a syndrome significantly increasing fracture risk and complicating fracture management. Approximately 30-40% of community-dwelling elderly have osteosarcopenia, with substantially higher prevalence (50-80%) in fracture populations. Combined effects include reduced bone quality with poor screw purchase, soft tissue cushioning deficiency, impaired healing capacity, increased postoperative complications, prolonged rehabilitation, and 1-year mortality of 15-30% after major fragility fractures.

Specialized surgical principles for sarcopenic fractures include: implant selection — locking compression plates with multidirectional locking screws (better resistance to pull-out in osteoporotic bone), proximal humeral and femoral nails specifically designed for elderly bone, augmented total hip arthroplasty with cement and longer stems, augmented sacroiliac screws with cement, and load-bearing rather than load-sharing constructs to permit early mobilization. Augmentation techniques: cement augmentation (PMMA) of screws (cementoplasty, augmented screws), cement-augmented intramedullary nails, augmentation of pedicle screws in spinal fractures, and use of expandable screws.

Adjuvant biologic enhancement: parathyroid hormone (teriparatide) accelerates fracture healing in selected cases (especially atypical femoral and stress fractures), bisphosphonates and denosumab continue antiresorptive effect (timing debated relative to surgery — some delay 4-6 weeks postoperatively), bone morphogenetic protein (BMP-2) for difficult cases (off-label), and platelet-rich plasma (limited evidence). Comprehensive perioperative management requires geriatric comanagement (anesthesia, frailty assessment, delirium prevention, pressure ulcer prevention, rehabilitation), nutritional optimization (protein intake 1.2-1.5 g/kg/day, vitamin D, calcium), early ambulation protocols (within 24-48 hours), comprehensive osteoporosis treatment after fracture (anti-osteoporotic therapy reduces secondary fracture risk by 30-70%), fall prevention, and home/social support assessment. Outcomes are improved with integrated orthogeriatric care models reducing 1-year mortality, complications, and readmission.