Overview
A humeral fracture is a break in any part of the humerus – the long bone that runs from the shoulder blade to the elbow. The humerus is the second‑largest bone in the body and plays a critical role in arm movement, supporting the shoulder joint, the elbow joint, and the muscles that lift and rotate the arm.
- Who it affects: All ages can sustain a humeral fracture, but the pattern differs:
- Children and adolescents more often break the proximal (upper) part near the growth plate.
- Adults 50‑80 years are prone to fractures from low‑impact falls, especially in the distal (lower) shaft.
- Young adult males frequently sustain high‑energy fractures from sports or motor‑vehicle collisions.
- Prevalence: In the United States, humeral fractures account for approximately 5‑8 % of all adult fractures, translating to roughly 600,000 cases each year [1]. The incidence rises sharply after age 65, mirroring the increase in osteoporosis.
Symptoms
The clinical presentation varies with the fracture location (proximal, shaft, or distal) and whether the injury is displaced.
- Pain: Immediate, sharp pain at the site of injury that worsens with movement or pressure.
- Swelling & bruising: Visible puffiness and discoloration develop within hours.
- Deformity: The arm may appear bent, shortened, or abnormally rotated, especially with displaced fractures.
- Limited range of motion: Inability to lift the arm, rotate the shoulder, or straighten the elbow.
- Crepitus: A grinding or clicking sensation when the arm is moved.
- Numbness or tingling: Indicates possible nerve involvement (e.g., radial or axillary nerve injury).
- Weakness: Reduced strength in the forearm, wrist, or hand if nerves or surrounding muscles are compromised.
- Open fracture signs: Bone fragments visible through the skin, accompanied by severe bleeding.
Causes and Risk Factors
Common causes
- Falls: The most frequent cause, especially falls onto an outstretched hand or directly onto the shoulder.
- Direct blows: Sports injuries (e.g., football, rugby), assaults, or accidents where the arm receives a direct impact.
- High‑energy trauma: Motor‑vehicle collisions, motorcycle crashes, or falls from height.
- Pathologic fractures: Bones weakened by tumors, infections, or metabolic diseases (e.g., osteoporosis, osteomalacia).
Risk factors
- Advanced age & osteoporosis – bone mineral density loss makes the humerus more fragile.
- Male gender – higher incidence of high‑energy injuries.
- Engagement in contact sports or high‑impact recreational activities.
- Use of corticosteroids or other medications that weaken bone.
- Concurrent neurological conditions that affect balance (e.g., Parkinson’s disease).
- Previous fractures or orthopedic surgery near the humerus.
Diagnosis
Prompt and accurate diagnosis is essential to determine whether the fracture can be treated non‑operatively or requires surgery.
Clinical assessment
- History taking – mechanism of injury, pain onset, and any prior bone disease.
- Physical examination – inspection for swelling, deformity, neurovascular status (pulse, capillary refill, sensation, motor function).
Imaging studies
- Plain radiographs (X‑ray): The first‑line test. AP (anteroposterior) and lateral views usually reveal fracture location, pattern (transverse, oblique, spiral), displacement, and involvement of the joint surfaces.
- Computed Tomography (CT): Provides 3‑D detail, especially useful for complex proximal humeral fractures involving the articular surface.
- MRI: Indicated when a fracture is occult on X‑ray, when soft‑tissue (muscle, tendon, ligament) injury is suspected, or to assess neurovascular compromise.
- Bone scan: Rarely used, reserved for cases of suspected stress fracture or metastatic disease.
Classification systems
- Neer classification: Utilized for proximal humeral fractures, categorizing based on the number of displaced parts.
- AO/OTA system: Applies to shaft and distal fractures, distinguishing between simple (type A), wedge (type B), and complex (type C) patterns.
Treatment Options
Treatment goals are pain control, fracture stability, restoration of anatomy, and early mobilization to prevent stiffness.
Non‑surgical management
- Immobilization: Sling, shoulder immobilizer, or functional brace for 2‑4 weeks, depending on fracture stability.
- Pain control: Acetaminophen, NSAIDs (ibuprofen, naproxen) unless contraindicated, and short courses of opioid analgesics for severe pain.
- Physical therapy: Initiated after the immobilization period; focuses on passive range‑of‑motion (ROM) progressing to active exercises.
- Activity modification: Avoid heavy lifting, overhead activities, and contact sports for 6‑12 weeks.
Surgical options
Surgery is considered for displaced fractures, intra‑articular involvement, neurovascular injury, or failure of conservative therapy.
- Open Reduction & Internal Fixation (ORIF): Plates, screws, and/or intramedullary nails realign and stabilize the bone.
- Hemiarthroplasty: Replacement of the humeral head, typically for severely comminuted proximal fractures in older adults.
- Reverse total shoulder arthroplasty: Utilized when rotator‑cuff integrity is compromised along with the fracture.
- External fixation: Rare, reserved for open fractures with extensive soft‑tissue damage.
Medications & adjuncts
- Bone health agents: Calcium (1,000–1,200 mg/day) and vitamin D (800–1,000 IU/day) for all patients, especially those with osteoporosis.
- Bisphosphonates or denosumab: Consider after fracture healing in patients with confirmed low bone density.
- Thromboembolism prophylaxis: Low‑molecular‑weight heparin (e.g., enoxaparin) if immobilization exceeds 48 hours, per ACCP guidelines.
Living with a Humeral Fracture
Daily management tips
- Cold therapy: Ice packs 15‑20 minutes every 2 hours for the first 48‑72 hours to reduce swelling.
- Elevation: Keep the arm supported on pillows to decrease edema.
- Pain diary: Track medication use and pain levels to guide adjustments with your provider.
- Shower adaptations: Use a handheld showerhead and place a waterproof sling to keep the arm dry.
- Home safety: Remove tripping hazards, install grab bars, and wear non‑slip footwear to prevent falls.
- Nutrition: Emphasize protein‑rich foods (lean meat, legumes, dairy) to support bone healing.
- Follow‑up appointments: Attend all scheduled radiographs and physical‑therapy visits; healing is typically visible by 6‑8 weeks.
Rehabilitation milestones
| Time Post‑Injury | Typical Goal |
|---|---|
| 0‑2 weeks | Pain control, protect fracture, passive shoulder ROM |
| 2‑6 weeks | Begin active‑assisted ROM, maintain elbow/wrist motion |
| 6‑12 weeks | Progress to active ROM, light strengthening of rotator cuff |
| 3‑6 months | Full strength training, return to normal activities |
Prevention
- Bone health optimization: Regular weight‑bearing exercise, adequate calcium and vitamin D, and screening for osteoporosis at age 65 (or earlier if risk factors exist).
- Fall‑prevention strategies: Balance training (Tai Chi, yoga), home safety modifications, vision checks, and medication review for sedatives.
- Protective equipment: Use helmets, elbow pads, and shoulder guards in high‑risk sports.
- Avoid high‑risk behaviors: Do not drive under the influence; use seat belts and child safety seats correctly.
- Regular health check‑ups: Monitor chronic conditions (diabetes, rheumatoid arthritis) that may affect bone quality.
Complications
If a humeral fracture is inadequately treated or left untreated, several complications can arise:
- Non‑union or delayed union: Failure of the bone to heal, leading to chronic pain.
- Malunion: Healing in a misaligned position, causing restricted shoulder or elbow motion.
- Neurovascular injury: Persistent radial or axillary nerve palsy, rare but serious.
- Joint stiffness: Adhesive capsulitis (“frozen shoulder”) due to prolonged immobilization.
- Post‑traumatic arthritis: Especially with intra‑articular fractures affecting the shoulder joint.
- Infection: In open fractures or after surgical fixation.
- Compartment syndrome (rare): Increased pressure in the arm compartments leading to muscle and nerve damage.
When to Seek Emergency Care
Call 911 or go to the nearest emergency department if you notice any of the following:
- Severe, worsening pain that is not relieved by prescribed medication.
- Visible bone protruding through the skin (open fracture).
- Sudden loss of sensation or movement in the hand, wrist, or fingers.
- Cold, pale, or bluish skin indicating compromised blood flow.
- Rapid swelling that spreads quickly up the arm.
- Signs of shock – dizziness, fainting, rapid heartbeat, or shallow breathing.
References:
[1] American Academy of Orthopaedic Surgeons. “Humerus Fractures.” AAOS, 2023.
[2] Mayo Clinic. “Humerus fracture.” Mayo Clinic, 2022.
[3] CDC. “Falls and Falls Prevention.” Centers for Disease Control and Prevention, 2021.
[4] NIH Osteoporosis and Related Bone Diseases National Resource Center. “Bone Health and Osteoporosis.” 2022.
[5] Cleveland Clinic. “Treatment of Humerus Fractures.” 2023.