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Quattro Fracture (Four‑Part Proximal Humerus Fracture) – Complete Medical Guide

Overview

A four‑part proximal humerus fracture, often called a “Quattro fracture,” is a severe break of the upper arm bone (the humerus) near the shoulder joint. The fracture divides the humeral head, greater tuberosity, lesser tuberosity, and the shaft into separate fragments.

These injuries most commonly occur in older adults, especially women with osteoporosis, but they can also affect younger individuals after high‑energy trauma such as motor‑vehicle collisions.

• Incidence: Proximal humerus fractures account for ~5% of all adult fractures; four‑part patterns represent roughly 10‑15% of those cases (CDC, 2022).
• Age & gender: Median age 68 years; women are 2‑3× more likely than men due to bone density loss.
• Geographic variation: Higher rates in regions with an aging population (e.g., North America, Europe).

Symptoms

The signs can be dramatic or subtle, depending on the displacement of fragments and associated soft‑tissue injury.

• Severe shoulder pain – often sudden, worsens with any movement.
• Limited or impossible active motion – inability to lift the arm, reach forward, or rotate.
• Visible deformity – a “squared‑off” hump or flattening of the shoulder contour.
• Swelling & bruising – can spread down the upper arm within hours.
• Crepitus – a grinding sensation felt on gentle palpation.
• Numbness or tingling – suggests nerve involvement, most often the axillary nerve.
• Weakness of the rotator cuff muscles – difficulty holding objects.
• Impaired blood flow – pale or cold hand, rare but indicates vascular compromise.

Causes and Risk Factors

Primary mechanisms

• Falls from standing height – the most common cause in older adults.
• High‑energy trauma – motor‑vehicle collisions, sports injuries, or falls from height in younger patients.
• Direct blows – e.g., during contact sports or assaults.

Risk factors

• Osteoporosis – low bone mineral density dramatically lowers the fracture threshold.
• Advanced age – reduced bone quality and slower reflexes.
• Female sex – hormonal changes after menopause accelerate bone loss.
• Chronic corticosteroid use – impairs bone formation.
• Alcoholism & smoking – both hinder bone healing.
• Previous shoulder pathology – rotator cuff tears or arthritis may weaken the region.
• Neuromuscular disorders – impair balance and increase fall risk.

Diagnosis

Prompt, accurate diagnosis is essential for deciding between surgical and non‑surgical management.

Clinical evaluation

• History: Mechanism of injury, pain pattern, previous shoulder problems, medication use.
• Physical exam: Inspection for deformity, palpation for tenderness, assessment of neurovascular status (especially axillary nerve), and passive/active range of motion.

Imaging studies

• Standard X‑rays – AP (anteroposterior) and scapular Y‑view; essential first step.
• CT scan with 3‑D reconstruction – Provides detailed view of fragment displacement, critical for surgical planning (Mayo Clinic, 2023).
• MRI – Reserved for suspected soft‑tissue injury (e.g., rotator cuff tear) or when nerve involvement is unclear.
• Bone scan or DEXA – May be ordered later to evaluate osteoporosis.

Classification systems

Four‑part fractures are classified using the Neer or AO/OTA systems. Neer defines a fracture as “four‑part” when >1 cm displacement or >45° angulation exists between any two of the four fragments.

Treatment Options

Management is individualized based on patient age, activity level, bone quality, fragment displacement, and overall health.

Non‑operative (conservative) treatment

• Sling immobilization – Usually for 3‑4 weeks; a well‑padded sling supports the arm and limits motion.
• Pain control – Acetaminophen, NSAIDs (if no contraindication), or short‑course opioids.
• Early passive range‑of‑motion (PROM) exercises – Initiated after pain subsides (often day 5‑7) to prevent stiffness.
• Physical therapy – Gradual progression to active assisted, then strengthened rotator cuff and scapular stabilizers (6‑12 weeks).

Conservative care is most successful when fragments are minimally displaced (<10 mm) and the patient has low functional demands.

Surgical options

Surgery is recommended for markedly displaced fragments, head‑splitting fractures, or when the patient is young/active.

• Open Reduction and Internal Fixation (ORIF) – Plates, screws, and sometimes tension band wiring to restore anatomy.
• Reverse Total Shoulder Arthroplasty (rTSA) – Preferred for elderly patients with poor bone stock or when the humeral head is not salvageable (Cleveland Clinic, 2024).
• Hemiarthroplasty – Replacement of the humeral head only; less common now due to functional limitations.
• Intramedullary nailing – Occasionally used when the shaft is involved, but not typical for pure four‑part fractures.

Post‑operative care typically involves 1‑2 weeks of sling protection, followed by a structured rehab protocol.

Medications to aid healing

• Analgesics – As above.
• Bone‑health agents – Calcium + vitamin D, bisphosphonates, or denosumab for underlying osteoporosis.
• Antibiotic prophylaxis – Standard peri‑operative antibiotics (e.g., cefazolin) to reduce infection risk.

Living with Quattro Fracture (Four‑Part Proximal Humerus Fracture)

Recovery can take 3‑12 months; patience and adherence to rehab are key.

Daily management tips

• Protect the shoulder – Keep the sling on as instructed; avoid reaching behind the back or lifting >5 lb during the early phase.
• Pain control – Schedule analgesics rather than “as needed” to maintain participation in therapy.
• Cold therapy – 15‑minute ice packs every 2‑3 hours for the first 72 hours reduces swelling.
• Home safety – Remove tripping hazards, install grab bars, and use a night‑light to prevent falls.
• Nutrition – Aim for 1,200 mg calcium and 800‑1,000 IU vitamin D daily; protein intake of 1.2‑1.5 g/kg body weight supports tissue repair.
• Monitor for complications – Watch for increasing pain, swelling, numbness, or fever.
• Follow‑up appointments – Keep all radiographic and clinical visits; adjustments to hardware or rehab may be needed.

Rehabilitation milestones

Time Post‑injury	Goal
0‑2 weeks	Immobilization, pain management, gentle pendulum exercises.
2‑6 weeks	Passive forward flexion & external rotation to 90°; begin scapular stabilization.
6‑12 weeks	Active‑assisted ROM, introduce isometric rotator cuff strengthening.
3‑6 months	Full active ROM, progressive resistance training, functional activities (e.g., dressing).
6‑12 months	Return to higher‑impact activities if cleared; maintain strengthening program.

Prevention

Because most four‑part fractures result from falls, prevention focuses on bone health and fall risk reduction.

• Bone density screening – Dual‑energy X‑ray absorptiometry (DEXA) for women >65 y and men >70 y, or earlier if risk factors exist (NIH, 2023).
• Calcium & vitamin D supplementation – 1,200 mg calcium and 800‑1,000 IU vitamin D daily for adults over 50.
• Exercise – Weight‑bearing, balance, and resistance training three times per week.
• Home safety modifications – Non‑slip mats, handrails on stairs, adequate lighting.
• Medication review – Discuss sedatives or antihypertensives that increase fall risk with your provider.
• Quit smoking and limit alcohol – Both impair bone remodeling.

Complications

If not addressed promptly, a four‑part fracture can lead to serious outcomes.

• Avascular necrosis (AVN) of the humeral head – Loss of blood supply leads to collapse; reported in up to 30 % of displaced fractures (WHO, 2022).
• Non‑union or malunion – Persistent pain and functional limitation.
• Post‑traumatic arthritis – Degenerative changes in the glenohumeral joint.
• Axillary nerve injury – Numbness over the deltoid; may be temporary or permanent.
• Infection – Particularly after ORIF or arthroplasty.
• Stiff shoulder (adhesive capsulitis) – Loss of motion that may require capsular release.
• Chronic pain – May need multidisciplinary pain management.

When to Seek Emergency Care

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Sources: Mayo Clinic. “Proximal humerus fractures.” 2023; CDC. “Fracture statistics.” 2022; NIH Osteoporosis and Related Bone Diseases National Resource Center, 2023; WHO. “Musculoskeletal health.” 2022; Cleveland Clinic. “Reverse shoulder arthroplasty.” 2024; peer‑reviewed articles in Journal of Orthopaedic Trauma and American Journal of Sports Medicine.

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