Humerus Fracture: Types, Treatment, and Recovery Times

To learn more, consult the guide on Radius Fracture: Rehabilitation and Recovery Times. To learn more, consult the guide on Pelvic Fracture: Causes, Treatment and Rehabilitation. To learn more, consult the guide on Rib Fracture: Symptoms, Healing Times and What to Do.

The humerus is the long bone that forms the skeleton of the arm, extending from the shoulder to the elbow. A traumatic event affecting this skeletal segment represents a clinically significant condition, capable of significantly compromising the functionality of the entire upper limb. When dealing with a humerus fracture recovery times and rehabilitation methods become the main concerns for the patient. The prognosis and return to normal daily activities depend on a multitude of factors, including the location of the injury, the displacement of bone fragments, the age of the subject, and the timeliness of medical and physiotherapy intervention. This article aims to analyze in detail and with scientific accuracy all aspects related to this pathology, from anatomical classification to the complete rehabilitation pathway.

Humerus Anatomy and Biomechanics

The humerus is the upper arm bone extending from shoulder to elbow, whose structure and movement patterns determine force distribution and rotational capacity during arm function. To fully understand the implications of a fracture, it is essential to recall the anatomy of the humerus. This bone articulates proximally with the scapula (forming the glenohumeral joint of the shoulder) and distally with the radius and ulna (forming the elbow joint). It is anatomically divided into three main regions:

For a complete overview, see the comprehensive guide to shoulder pain.

Proximal Extremity

The proximal extremity includes the humeral head (hemispherical in shape), the anatomical neck, the surgical neck (a constricted area frequently subject to fractures), and two bony prominences called the greater and lesser tuberosities (or trochiter and trochin). These tuberosities are of vital biomechanical importance as they serve as insertion points for the rotator cuff tendons, the muscles responsible for shoulder stability and movement.

Humeral Diaphysis

The diaphysis is the central body of the bone, approximately cylindrical in shape, becoming more prismatic distally. On its posterior surface is the radial nerve groove, a crucial anatomical structure: the radial nerve runs in close contact with the bone in this location, making it extremely vulnerable in the event of diaphyseal fractures.

Distal Extremity

The distal extremity widens to form the humeral condyles (capitellum and trochlea), which articulate with the forearm bones. On the sides are the medial and lateral epicondyles, anchoring points for the flexor and extensor muscles of the wrist and hand. Fractures in this region are particularly complex due to the involvement of the elbow joint.

Classification and Types of Fracture

Humeral fractures are classified based on their anatomical location, a factor that determines the therapeutic approach and healing times.

Proximal Humeral Fractures

They represent about 5-6% of all adult fractures and are particularly common in the elderly population. The most widely used clinical classification is Neer’s, which evaluates the number of “fragments” (from one to four) and their degree of displacement. A fracture is defined as displaced if the bone fragment has moved more than 1 centimeter or has angulated more than 45 degrees from its original anatomical position. These fractures can involve the surgical neck, anatomical neck, or tuberosities, often compromising rotator cuff function.

Diaphyseal Fractures

These involve the central portion of the bone. They can present with transverse, oblique, spiral, or comminuted fracture lines (with multiple bone fragments). Spiral fractures are often the result of torsional trauma, such as those occurring in some sports or work accidents. The most feared complication in this location, as mentioned, is injury or stretching of the radial nerve.

Distal Humeral Fractures

These are complex injuries that often involve the articular surface of the elbow (intra-articular fractures). They can be supracondylar (more common in children), intercondylar, or involve the epicondyles. Due to the complex anatomy of the elbow, these fractures carry a high risk of post-traumatic joint stiffness.

Causes and Risk Factors

The etiology of humeral fractures varies significantly based on the patient’s age and general health conditions.

High-Energy Trauma

In young adults, fractures are predominantly caused by high-energy trauma. These include road accidents (car or motorcycle), falls from great heights, work accidents, or direct trauma during contact sports (rugby, skiing, cycling, martial arts). In these cases, fractures tend to be more complex, often diaphyseal or multifragmentary.

Low-Energy Trauma and Osteoporosis

In the elderly population, especially in postmenopausal women, the main cause is low-energy trauma, such as a simple accidental fall to the ground with direct impact on the shoulder or elbow, or a fall with an outstretched arm in an attempt to protect oneself. Osteoporosis, a systemic skeletal disease characterized by a reduction in bone mass and a deterioration of bone tissue microarchitecture, is the main risk factor, making the bone fragile and susceptible to fractures even from minor trauma.

Pathological Fractures

Less frequently, the humerus can fracture due to pre-existing conditions that weaken the bone structure, such as primary bone tumors, bone metastases, bone cysts, or infections (osteomyelitis). In these cases, it is referred to as a pathological fracture, and the triggering trauma may be entirely irrelevant or even absent (spontaneous fracture).

Symptoms and Clinical Signs

The clinical picture of a humeral fracture is generally unequivocal and manifests acutely immediately after the traumatic event. The main symptoms include:

• Acute and throbbing pain: Localized at the fracture site, which worsens with the slightest attempt at movement.
• Functional impairment: Inability to move the arm, shoulder, or elbow.
• Swelling (edema): Rapid swelling of the surrounding soft tissues.
• Hematoma and ecchymosis: Appearance of bruises which, in the case of proximal fractures, tend to descend along the arm and chest in the days following the trauma (Hennequin’s sign).
• Visible deformity: In the case of displaced fractures, the arm may appear shortened, angulated, or abnormally rotated.
• Bone crepitus: A tactile or auditory sensation of rubbing between bone fragments (not to be intentionally sought to avoid further damage).
• Neurological or vascular alterations: Tingling, numbness, or weakness in the hand and fingers, or pallor of the limb, indicating possible involvement of nerves or blood vessels.

Diagnosis

Timely and accurate diagnosis is fundamental for planning the most appropriate treatment. The diagnostic pathway must always be entrusted to a specialist doctor.

Clinical Examination

The doctor performs an anamnesis to understand the dynamics of the trauma and an accurate physical examination. The integrity of the skin (to rule out open fractures), the presence of deformities, and, above all, the neurovascular status of the upper limb are evaluated by testing sensitivity, finger motility, and peripheral pulses.

Imaging Diagnostics

• X-ray (RX): This is the first-level examination, essential for confirming the presence of the fracture, its location, and the degree of displacement. Projections are generally performed in two planes (anteroposterior and lateral).
• Computed Tomography (CT): This is requested in cases of complex, multifragmentary, or intra-articular fractures. CT provides detailed three-dimensional images, indispensable for planning any surgical intervention.
• Magnetic Resonance Imaging (MRI): Less used in the acute phase for bone, but can be prescribed later to evaluate associated soft tissue injuries, such as rotator cuff tendon tears or ligamentous injuries.

Medical and Surgical Treatment

The choice of treatment depends on the type of fracture, the degree of displacement, the patient’s age, their functional demands, and the presence of concomitant pathologies. The decision rests solely with the orthopedic surgeon.

Conservative Treatment

Non-surgical treatment is indicated for most undisplaced or minimally displaced fractures. It consists of immobilizing the limb to allow for bone callus formation.

• Braces and bandages: For proximal fractures, Desault or Gilchrist type braces are often used, which keep the arm close to the body. For diaphyseal fractures, Sarmiento’s functional brace is frequently employed, a bivalve corset that compresses soft tissues, stabilizing the bone while allowing early mobility of adjacent joints.
• Immobilization times: Generally vary from 3 to 6 weeks, during which periodic radiographic checks are performed to monitor bone consolidation.

Surgical Treatment

Surgical intervention is necessary in cases of severely displaced, open, multifragmentary fractures, those associated with vascular or neurological injuries, or in case of failure of conservative treatment.

• Osteosynthesis: Consists of realigning bone fragments and fixing them internally using metallic fixation devices (generally made of titanium or surgical steel) such as plates and screws, intramedullary nails (inserted inside the bone canal), or Kirschner wires.
• Arthroplasty: In extremely complex proximal fractures in elderly patients, where the humeral head is irremediably damaged or at risk of avascular necrosis, joint replacement with a prosthesis (endoprosthesis or reverse prosthesis) may be opted for.

The Physiotherapy Rehabilitation Pathway

Rehabilitation is an essential component for therapeutic success. A perfect surgical intervention or correct immobilization loses effectiveness if not followed by an adequate physiotherapy pathway. Timings and methods vary enormously from patient to patient; therefore, it is mandatory to follow the instructions of your doctor or physical therapist.

The bone healing process (bone callus formation) takes time and follows precise biological phases: inflammation, fibrocartilaginous callus formation (soft callus), ossification (hard callus), and remodeling. Physiotherapy must respect these biological times.

Phase 1: Immobilization and Protection (0-4 weeks)

In this initial phase, the primary objective is to protect the fracture site to allow the onset of bone consolidation, while controlling pain and edema.

• Edema management: It is advisable to keep the hand elevated when possible and perform gentle pumping movements.
• Mobilization of adjacent joints: It is crucial to actively move joints not involved in immobilization. If the fracture is proximal, active movements of the wrist, hand, and fingers are encouraged, as well as cervical spine movements to prevent muscle contractures.
• Isometric exercises: Under close supervision, gentle muscle contraction exercises without joint movement (isometrics) can be introduced to maintain muscle tone and stimulate blood circulation.

Phase 2: Recovery of Passive and Assisted Active Mobility (4-8 weeks)

When the orthopedic surgeon, through radiographic control, confirms the presence of initial bone callus and authorizes the partial or total removal of the brace, true joint rehabilitation begins.

• Passive mobilization: The physical therapist gently moves the joint (shoulder or elbow, depending on the fracture site) to prevent capsular stiffness and regain degrees of movement (ROM – Range of Motion).
• Assisted active mobilization: The patient begins to move the limb with the help of the healthy arm, a stick, or the physical therapist. Pendulum exercises for the shoulder are introduced, which use gravity to decompress the joint.
• Manual therapy: Myofascial release techniques to treat muscle contractures secondary to prolonged immobilization (e.g., trapezius, neck muscles, biceps).

Phase 3: Muscle Strengthening and Proprioception (8-12 weeks)

With the progressive solidification of the fracture, the focus shifts to regaining muscle strength and neuromotor control.

• Free active exercises: The patient performs full movements against gravity alone.
• Progressive strengthening: Gradual resistances are introduced using light weights, elastic bands (Theraband), or isotonic machines. It is crucial to strengthen the rotator cuff, scapular stabilizing muscles, and arm muscles (biceps and triceps).
• Proprioception: Exercises aimed at restoring awareness of the limb’s position in space and improving joint stability, using unstable surfaces or therapeutic balls.

Phase 4: Return to Activities and Sport-Specific Movements (Beyond 12 weeks)

The final phase aims at the patient’s complete reintegration into their work, daily, and sports activities.

• Functional exercises: Simulation of specific movements required by work or practiced sport.
• Plyometrics and power: For athletes, high-speed and load exercises are included to prepare tissues for the mechanical stresses of sport.
• Full recovery of strength and mobility can take from 6 to 12 months, depending on the initial severity and commitment to the rehabilitation program.

Recommended Therapeutic Exercises

Please note: The following exercises are for informational purposes only. Do not undertake any physical activity without prior authorization from your doctor or physical therapist, who will assess the suitability of the exercise for the specific healing phase.

Pendulum Exercises (Codman’s)

Ideal in the early stages of weaning from the brace for proximal fractures. The patient leans on a table with the healthy arm, bending the trunk forward. The injured arm is allowed to hang relaxed towards the floor. Small circular movements or oscillations (forward-backward, right-left) are performed, generated by trunk movement, without actively contracting the shoulder muscles.

Isometric Exercises

Useful for reawakening muscles without stressing the joint. For example, for the shoulder: standing near a wall, gently push the fist against the wall (to stimulate flexion) or the elbow backward against the wall (for extension), maintaining the contraction for 5-10 seconds without any actual limb movement.

Exercises with Elastic Bands (Advanced Phases)

Used for muscle strengthening. By attaching an elastic band to a handle, internal and external shoulder rotation exercises can be performed, keeping the elbow flexed at 90 degrees and close to the side. The resistance of the elastic band should be gradually increased over the weeks.

Possible Complications

Despite adequate treatment, humeral fractures can present some complications, requiring careful clinical monitoring.

Radial Nerve Injury

As mentioned, it is the most frequent neurological complication in humeral diaphyseal fractures (up to 18% of cases). It manifests as an inability to extend the wrist and fingers (wrist drop) and altered sensation on the back of the hand. In most cases, it is a neuropraxia (a temporary stretch) that resolves spontaneously within a few months, but it requires electromyographic monitoring and, sometimes, surgical exploration.

Nonunion and Delayed Union

Delayed union refers to when the fracture takes longer than expected to heal. Nonunion occurs when the bone healing process permanently stops, creating a “false joint” at the fracture site. Risk factors include smoking, diabetes, infections, excessive fragment mobility, or poor vascularization. Treatment for nonunion is generally surgical.

Joint Stiffness (Frozen Shoulder or Elbow Stiffness)

Prolonged immobilization and the trauma itself can lead to retraction of the joint capsule and the formation of scar adhesions. Adhesive capsulitis (frozen shoulder) results in severe limitation of movement and pain. Prevention through early and well-dosed physiotherapy is the best weapon against this complication.

Infections

These represent a risk associated primarily with open fractures or surgical interventions. They require timely antibiotic treatment and, in severe cases, surgical wound debridement and removal of fixation devices.

Prevention

Prevention of humeral fractures is based on reducing risk factors, particularly those related to falls and bone health.

• Fall prevention: Especially in the elderly, it is essential to make the home environment safe (remove slippery rugs, adequately light rooms, install grab bars in bathrooms). The use of appropriate footwear and, if necessary, walking aids is strongly recommended.
• Bone health: Prevention and treatment of osteoporosis are crucial. Adequate intake of Calcium and Vitamin D (through diet or supplements, under medical advice), sun exposure, and screening tests such as DEXA (Dual-energy X-ray absorptiometry) in postmenopausal women are recommended.
• Physical activity: Maintaining good muscle strength, balance, and coordination through regular physical activity (such as walking, gentle exercise, tai chi) significantly reduces the risk of falls and improves bone density.
• Safety in sports and driving: The use of adequate protection during risky sports activities and strict adherence to road safety regulations are essential to prevent high-energy trauma.

Frequently Asked Questions (FAQ)

How long does it take for a humeral fracture to fully heal?

Biological bone healing times generally vary from 6 to 12 weeks. However, complete functional recovery (strength, mobility, and absence of pain) takes much longer, usually from 3 to 6 months, and in some complex cases can extend up to a year. Consistency in rehabilitation is the determining factor.

When can I start driving again?

Driving is only permitted when the orthopedic surgeon certifies bone consolidation has occurred and when sufficient strength and mobility have been recovered to safely handle the steering wheel, even in emergency situations. Generally, this does not happen before 8-12 weeks after the trauma, but the assessment must be strictly individual and agreed upon with your doctor or physical therapist.

How should I sleep with a humeral fracture?

In the first few weeks, sleeping can be very painful. It is advisable to rest in a semi-seated position (using multiple pillows behind your back or a reclining armchair) to reduce edema and tension on the joint. It is important to place a small pillow under the injured elbow or arm to provide support and prevent the limb from “falling” backward, stretching the fracture site.

Should I wear the brace at night too?

Yes, during the immobilization phase prescribed by the doctor, the brace must be worn strictly even at night. Removing it during sleep exposes you to the risk of uncontrolled involuntary movements that could displace the fracture or damage healing tissues. The brace should only be removed for personal hygiene, following specific medical instructions.

When is the right time to start physiotherapy?

The start of physiotherapy depends on the type of treatment (conservative or surgical) and the orthopedic surgeon’s indications. Often, light movements of the fingers, wrist, and neck can begin from the first few days. Mobilization of the shoulder or elbow generally starts after 3-4 weeks, as soon as the first bone callus formation is evident. It is essential not to take independent initiatives and always rely on the timings dictated by your doctor or physical therapist.

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Frequently Asked Questions

What are the main types of humerus fractures and how do they differ in terms of treatment?

Humerus fractures are broadly classified by their location: proximal (near the shoulder), diaphyseal (shaft), and distal (near the elbow). Proximal fractures often involve the shoulder joint, diaphyseal fractures affect the bone’s main body, and distal fractures are close to the elbow joint. Treatment varies significantly based on the fracture type, stability, and whether conservative or surgical intervention is required.

What is the role of physical therapy in the recovery process for a humerus fracture?

Physical therapy is a critical component of humerus fracture recovery, guiding patients through progressive phases of rehabilitation. It focuses on restoring range of motion, strength, and function to the affected arm while ensuring proper healing. A physical therapist designs a tailored program to facilitate optimal recovery and prevent long-term complications.

What are some common complications that can arise from a humerus fracture?

Humerus fractures can lead to several complications, including radial nerve injury, nonunion or delayed union of the bone, and joint stiffness in the shoulder or elbow. Infections are also a risk, particularly following surgical intervention. Early detection and management of these issues are crucial for a successful recovery.

What factors influence the overall recovery time and outcome after a humerus fracture?

Recovery from a humerus fracture is influenced by several factors, including the fracture’s location and severity, the degree of bone displacement, and the patient’s age and overall health. Prompt and appropriate medical and physical therapy interventions also play a significant role in determining the recovery timeline and functional outcome.

Disclaimer medico: Le informazioni contenute in questo articolo hanno finalità esclusivamente educativa e informativa. Non sostituiscono il parere del medico o del fisioterapista. Per diagnosi e trattamento rivolgersi al proprio medico o fisioterapista di fiducia.

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