Imaging for Elderly Nursing Home Patients with Fall onto Buttock

Initial Imaging Approach

The American College of Radiology recommends obtaining AP pelvis and lateral views as the initial screening examination because radiographs are rapidly obtained, well-tolerated, and can identify obvious fractures if present 1
Plain pelvic X-rays have only 10.5% sensitivity for detecting sacral fractures in elderly patients due to overlying bowel gas, fecal material, vascular calcifications, and soft tissue 2
In elderly osteoporotic patients, radiographs are particularly insensitive and may remain negative even when fractures are present 2, 3

The American College of Radiology suggests that if pain substantially limits mobilization or weight-bearing, a CT pelvis without contrast should be obtained immediately, as this indicates potential instability requiring surgical consideration 2
Clinical suspicion remains high despite negative radiographs, and elderly patients with osteoporosis and fall mechanism warrant CT 2, 1
If a patient has persistent pain at 1-2 week follow-up, a CT pelvis without contrast should be obtained, as this suggests occult fracture 3

Sacral insufficiency fractures occur at predictable sites and may present with intractable lower back or pelvic pain with loss of mobility 2

If radiographs show obvious fracture, no further imaging is needed for diagnosis, and orthopedic consultation and surgical planning should be initiated 2, 1
If radiographs are negative but the patient cannot mobilize due to pain, a CT pelvis without contrast should be obtained immediately 2

The American College of Radiology recommends activating interdisciplinary orthogeriatric consultation to optimize comorbidities and reduce complications 4, 5
Multimodal analgesia with acetaminophen and consideration of peripheral nerve block, minimizing opioids to prevent delirium, should be implemented 4
Obtaining CBC, BMP, ECG as part of preoperative workup is recommended 4, 5
The American College of Radiology advises against prescribing bed rest, as immobility increases mortality, and allows weight-bearing as tolerated even before definitive diagnosis 6

Surgery within 24-48 hours reduces mortality in elderly hip and pelvic fractures 4, 5
Elderly patients with bleeding disorders on anticoagulation require urgent fracture identification to guide reversal decisions and surgical timing 4

Hemodynamic instability is uncommon in low‑energy sacral insufficiency fractures; nevertheless, assess systolic BP < 90 mmHg, shock index > 1, or need for transfusion to identify the rare high‑risk case. 7

Plain AP/lateral pelvis radiographs detect only about 10 % of sacral fractures in this population (sensitivity ≈ 10.5 %). 7
CT of the pelvis without contrast is the definitive imaging modality, with sensitivity of 88–98 % and superior specificity compared with other studies. 7
MRI is reserved for equivocal CT findings or when neurological deficits are present; it is not required for straightforward insufficiency fractures. 7
Bone scintigraphy shows the “Honda sign” with a positive predictive value of 94 % but a sensitivity of only 63 %; therefore, it is less reliable than CT. 7

Begin immediate weight‑bearing as tolerated; avoid bed rest because immobility increases mortality in the elderly. [8][9]
Employ multimodal analgesia with acetaminophen as first‑line and minimize opioid use to reduce delirium risk. [8][9]
Consider peripheral nerve blocks for severe pain when needed. [8][9]

Start oral bisphosphonate therapy (alendronate or risedronate) immediately; these agents lower vertebral fracture risk by ~47‑48 %, non‑vertebral fractures by 26‑53 %, and hip fractures by ~51 %. [8][9]
Provide calcium supplementation 1000–1200 mg daily (dietary plus supplement as required). 9
Administer vitamin D 800 IU daily, which reduces non‑vertebral fractures by 15‑20 % and falls by ~20 %. 9
For patients unable to take oral bisphosphonates (e.g., cognitive impairment, malabsorption, non‑compliance), use intravenous zoledronic acid or subcutaneous denosumab. [8][9]
Teriparatide is an option for individuals with very severe osteoporosis. [8][9]
Do not postpone osteoporosis therapy awaiting DXA results; the acute fracture itself justifies immediate treatment. 8

Implement interdisciplinary orthogeriatric consultation for frail elderly patients with multiple comorbidities and polypharmacy; this collaborative approach improves clinical outcomes. [8][9]

All statements are supported by the cited peer‑reviewed evidence.