Pelvic Fracture: Causes, Treatment and Recovery Times

To learn more, consult the guide on Femur Fracture: Rehabilitation and Recovery Times.

The pelvis is one of the most important and complex bone structures in the human body. It acts as a connecting ring between the spine and the lower limbs, supporting the weight of the upper body and protecting vital organs located in the pelvic cavity. When facing the complex clinical journey of a pelvic injury, the combination of pelvic fracture rehabilitation is the central focus to ensure the patient’s return to an active life, recovery of ambulation, and resolution of pain. A fracture in this area is a traumatic event that requires rigorous medical assessment and a meticulous physiotherapy program.

This article thoroughly explores the anatomy, causes, diagnostic methods, treatment options, and, most importantly, the fundamental rehabilitation pathway necessary to overcome a pelvic fracture.

Anatomy and Biomechanics of the Pelvis

The pelvis is a ring-shaped bone structure at the hip base that supports the spine and protects internal organs, presenting as pain, instability, or functional limitation when fractured. To understand the severity and implications of a pelvic fracture, it is essential to know its anatomy. The pelvis is a ring-shaped structure formed by three main bones:

• The sacrum, located at the base of the spine.
• The coccyx, the terminal end of the spine.
• The two iliac bones (or innominate bones), which in turn are formed by the fusion of three bones during development: the ilium, the ischium, and the pubis.

These bones are held together by a dense and robust network of ligaments. Anteriorly, the two pubic bones join at the pubic symphysis, while posteriorly the iliac bones articulate with the sacrum, forming the sacroiliac joints.

From a biomechanical perspective, the pelvic ring distributes load forces from the trunk to the lower limbs during standing and walking. Furthermore, it houses and protects fundamental organs such as the bladder, rectum, and reproductive organs, as well as important blood vessels (such as the iliac arteries) and nerves (such as the lumbosacral plexus). A fracture that disrupts the integrity of this ring immediately compromises the body’s weight-bearing capacity.

Causes and Risk Factors

Pelvic fractures can be classified based on the energy of the trauma that caused them. The causes vary significantly depending on the patient’s age and bone health.

High-Energy Trauma

In young and healthy individuals, pelvic fractures are almost always the result of high-energy trauma. These include:

• Road accidents: Car or motorcycle collisions, or pedestrian accidents.
• Falls from great heights: Work-related injuries (e.g., scaffolding) or sports accidents (e.g., mountaineering).
• Crush injuries: Often related to industrial or agricultural accidents.

These fractures are often unstable, complex, and can be associated with internal organ injuries, severe hemorrhages, and neurological damage, representing in some cases a life-threatening medical emergency.

Low-Energy Trauma (Fragility Fractures)

In the elderly, or in individuals suffering from osteoporosis, bone loses density and strength. In these cases, a pelvic fracture can occur as a result of low-energy trauma, such as:

• Accidental falls at home: Slipping on a rug or falling from a standing position.
• Sudden torsional movements.

These fractures (often affecting the pubic rami) tend to be stable, do not completely disrupt the pelvic ring, and rarely cause internal organ damage, but are nevertheless extremely painful and debilitating.

Avulsion Fractures

Common in adolescents and athletes, they occur when a sudden and violent muscle contraction tears off a bone fragment at the tendon’s insertion point (for example, at the anterior iliac spine or the ischial tuberosity).

Symptoms and Clinical Signs

The symptomatology of a pelvic fracture varies according to the severity of the injury, but the most common symptoms include:

• Acute pain: Localized in the groin, hip, lower back, or buttocks. Pain significantly worsens with movement or when attempting to bear weight on the lower limb.
• Inability to walk: Or extreme difficulty in maintaining an upright position.
• Swelling and ecchymosis: Presence of extensive bruising in the pelvic area, on the hips, or in the perineal region.
• Deformity: In cases of displaced high-energy fractures, the lower limbs may appear asymmetrical or internally/externally rotated.
• Neurological or vascular symptoms: Numbness, tingling in the lower limbs, or signs of hemorrhagic shock (pallor, tachycardia, hypotension) in major traumas.

Diagnosis

Timely and accurate diagnosis is fundamental for establishing the correct therapeutic plan. The diagnostic process always begins with a thorough clinical examination, during which the doctor assesses the stability of the pelvis, the presence of pain on palpation, and the neurological and vascular integrity of the lower limbs.

Instrumental examinations are indispensable:

• X-ray (RX): This is the first-level examination. It allows visualization of most fractures and assessment of the pelvic ring alignment.
• Computed Tomography (CT): This represents the “gold standard” for pelvic fractures. It provides detailed three-dimensional images, essential for understanding the complexity of the fracture, evaluating joint involvement (such as the acetabulum), and planning potential surgical intervention.
• Magnetic Resonance Imaging (MRI): Used less frequently in acute cases, it is useful for diagnosing occult fractures (not visible on X-rays), bone edema, or soft tissue, ligament, and nerve injuries.

Classification of Pelvic Fractures

From a clinical and rehabilitative perspective, the most important distinction is between stable and unstable fractures.

• Stable Fractures: The pelvic ring is interrupted at only one point, or the fracture does not compromise the pelvis’s ability to bear weight. The bones remain aligned. They are typical of low-energy trauma.
• Unstable Fractures: The pelvic ring is broken in two or more places, with displacement of bone fragments. The structure is no longer able to support physiological load. They almost always require surgical intervention.

Medical and Surgical Treatment

Treatment depends on the stability of the fracture, the patient’s age, and the presence of associated injuries.

Conservative Treatment

Indicated for stable fractures (e.g., isolated pubic rami fractures). It includes:

• Bed rest: For a limited period, to avoid complications from prolonged immobilization.
• Pain control: Through analgesic and anti-inflammatory drugs.
• Use of aids: Crutches or walkers to avoid bearing weight on the affected limb during the early stages of healing.
• Anticoagulant therapy: To prevent deep vein thrombosis (DVT).

Surgical Treatment

Necessary for unstable or displaced fractures. The goal is to restore the anatomy of the pelvic ring and stabilize it to allow early mobilization. Options include:

• External Fixation: Use of pins inserted into the bones and connected to a metal structure outside the body. Often used as a temporary measure in emergencies.
• Internal Fixation (Osteosynthesis): Repositioning of bone fragments and their stabilization using surgically inserted metal plates and screws.

Pelvic Fracture Rehabilitation: The Physiotherapy Pathway

Rehabilitation after a pelvic fracture is a long, gradual, and highly personalized process. The timing and permitted loads depend on the orthopedic surgeon’s instructions. The physiotherapy pathway is generally divided into four main phases.

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

In this phase, the primary goal is to protect the fracture, manage pain, and prevent complications related to bed rest (such as thrombosis, pressure sores, and respiratory infections).

• Respiratory physiotherapy: Diaphragmatic breathing exercises to maintain lung expansion.
• Vascular prevention: Active ankle movements (muscle pump) to promote venous return.
• Isometric contractions: Gentle activation without joint movement of the quadriceps and gluteal muscles to prevent severe muscle atrophy.
• Passive and active-assisted mobilization: Of joints not directly involved (ankle, knee, upper limbs).
• Transfers: Learning correct techniques for moving from bed to wheelchair without stressing the pelvis.

Phase 2: Mobility Recovery and Partial Weight-Bearing (4-8 weeks)

When the bone callus begins to form and the doctor authorizes the first weight-bearing allowances, physiotherapy becomes more active.

• Hydrokinesitherapy (Water Physiotherapy): The microgravity environment of the rehabilitation pool is excellent in this phase. Water supports body weight, allowing the patient to start walking and moving the hips with reduced load and without pain.
• Joint range of motion (ROM) exercises: Gradual recovery of hip flexion, extension, abduction, and rotation, always respecting the pain threshold.
• Light muscle strengthening: Use of low-resistance bands or light weights to begin toning the muscles of the lower limbs and the “core” (abdominals and lower back).
• Gait training: Use of walkers or crutches, teaching the patient partial weight-bearing (e.g., touch-down weight-bearing or 20-30% of body weight).

Phase 3: Muscle Strengthening and Full Weight-Bearing (8-12 weeks)

With radiographic confirmation of bone consolidation, the gradual discontinuation of aids begins.

• Weaning from crutches: Transition from two crutches to one, until independent ambulation.
• Progressive muscle strengthening: Specific focus on pelvic stabilizing muscles, particularly the gluteus medius, to prevent limping (Trendelenburg sign). Closed kinetic chain exercises are introduced (e.g., light leg press, mini-squats).
• Proprioception and balance: Exercises on unstable boards (Freeman), proprioceptive cushions, or obstacle courses to re-educate the nervous system to manage balance and joint stability.
• Postural re-education: Correction of any postural compensations acquired during months of pain and crutch use.

Phase 4: Return to Daily and Sports Activities (Beyond 3 months)

The last phase aims at the complete restoration of pre-injury functionality.

• Advanced functional exercises: Simulation of specific work activities or athletic movements.
• Cardiovascular training: Stationary bike, brisk walking, swimming.
• Plyometrics and agility: Only for young and athletic patients, gradual introduction of jumps and changes of direction, with prior medical authorization.

Recommended Therapeutic Exercises

Although the program should always be supervised, some typical exercises prescribed during rehabilitation include:

• Heel slides: Lying supine, slowly bend the knee, sliding the heel towards the glute, then extend the leg again. Helps hip and knee mobility.
• Supine hip abduction: Spread the leg laterally, keeping it straight, then return to the center. Stimulates the gluteus medius.
• Glute bridge (Bridging): Lying supine with knees bent, slowly lift the pelvis off the bed by contracting the glutes. (To be performed only when weight-bearing and stability allow).
• Clamshell: Lying on the healthy side, knees bent, lift the upper knee while keeping the feet together.

Please note: The execution of any exercise must be pre-approved by your doctor or physical therapist. Self-treatment can cause severe damage or delays in healing.

Recovery Times

Recovery times for a pelvic fracture are highly variable.

• Bone healing (formation of solid bone callus) generally requires 6 to 12 weeks.
• Complete functional recovery, which includes restoration of muscle strength, balance, and absence of pain during intense efforts, can require 6 to 12 months.

In high-energy traumas with associated nerve injuries, the process can extend beyond a year. Consistency in physiotherapy and adherence to medical prescriptions are the determining factors for optimizing recovery times.

Possible Complications

A pelvic trauma can lead to both short-term and long-term complications, which the rehabilitation team must monitor:

• Nonunion or delayed union: The bone does not heal within the expected timeframe.
• Malunion: The bone heals in a non-anatomical position, causing leg length discrepancies (one leg shorter than the other) or biomechanical alterations.
• Chronic pain: Often localized at the sacroiliac joints or the pubic symphysis.
• Neurological damage: Injuries to the sciatic, femoral, or pudendal nerve, which can cause motor or sensory deficits, or sphincter/sexual dysfunctions.
• Post-traumatic osteoarthritis: Especially if the fracture involved the acetabulum (the hip joint).

Prevention

Prevention plays a key role, especially for low-energy fractures.

• Bone health: Monitor bone density (DEXA scan) after age 50. Supplement, under medical advice, Calcium and Vitamin D, and maintain an active lifestyle to stimulate bone metabolism.
• Fall prevention in the elderly: Adapt the home environment by removing slippery rugs, improving lighting, installing grab bars in bathrooms, and using appropriate footwear.
• Safety: Always use seat belts in the car and wear appropriate protective equipment during extreme sports or risky jobs.

Read also: Sequential Bilateral Total Hip Arthroplasty (THA)

Frequently Asked Questions (FAQ)

How long does it take to walk again after a pelvic fracture?

The time required to resume walking depends on the stability of the fracture and the type of treatment. In stable fractures treated conservatively, crutch use can begin after just a few days. In unstable fractures treated surgically, weight-bearing on the limb may be prohibited for 6-8 weeks. The definitive discontinuation of crutches usually occurs between 2 and 4 months, always under the guidance of your doctor or physical therapist.

Can a pelvic fracture heal without surgery?

Yes, absolutely. Stable fractures, such as isolated ischiopubic rami fractures (very common in the elderly following accidental falls), generally heal with rest, pain management, and adequate physiotherapy, without the need for surgery.

What are the risks if physiotherapy is not done after the fracture?

Avoiding rehabilitation exposes one to numerous risks: permanent joint stiffness (especially in the hip and lumbar spine), severe muscle atrophy, chronic limping, postural alterations that can cause secondary back pain, and an increased risk of new falls due to loss of balance and proprioception. To learn more, consult the guide on Hip Replacement.

Is it normal to have groin or back pain months later?

A certain degree of discomfort can be normal in the first 6-12 months, especially after prolonged physical exertion or weather changes. However, if the pain is acute, debilitating, or worsening, it could indicate a malunion, inflammation of the sacroiliac joint, or early osteoarthritis. In these cases, a clinical re-evaluation is essential.

When is it possible to resume driving?

Resuming driving depends on the recovery of muscle strength, reaction times (necessary for emergency braking), and the absence of acute pain. Generally, driving is not permitted while taking opioid pain medication and until full weight-bearing on the limb is possible without crutches. This usually occurs between 8 and 12 weeks, but must be authorized by the specialist doctor.

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For a broader overview of related conditions, see our complete guide to hip pain.

Sources and Scientific References

1. Rommens PM, Hofmann A. Comprehensive classification of fragility fractures of the pelvic ring: Recommendations for surgical treatment. Injury. 2013;44(12):1733-
2. DOI: target=”_blank” rel=”noopener”>10.1016/j.injury.2013.06.023
3. Halawi MJ. Pelvic ring injuries: Surgical management and long-term outcomes. J Clin Orthop Trauma. 2016;7(1):1-

Sources and Scientific References

1. Sherrington C et al. (2019). Exercise for preventing falls in older people living in the community. Cochrane Database Syst Rev. 1:CD012424. DOI | PubMed
2. Patil DS et al. (2023). Physiotherapy Management Focusing on Early Mobilisation in Complex Pelvic and Pott’s Fracture. Cureus. 15:e49525. DOI | PubMed
3. Reiman MP et al. (2020). Consensus recommendations on the classification, definition and diagnostic criteria of hip-related pain in young and middle-aged active adults from the International Hip-related Pain Research Network, Zurich 2018. Br J Sports Med. 54:631-641. DOI | PubMed
4. Hesse KL et al. (2010). Associations between physiotherapy findings and subsequent diagnosis of pelvic or hindlimb fracture in racing Thoroughbreds. Equine Vet J. 42:234-9. DOI | PubMed
5. Carter C et al. (2025). Rehabilitation after pelvic fragility fracture in older adults: a scoping review. Osteoporos Int. 36:1143-1154. DOI | PubMed

Frequently Asked Questions

Why is physiotherapy essential after a pelvic fracture?

Pelvic fracture rehabilitation, guided by a dedicated physiotherapy program, is crucial for regaining an active life, restoring walking ability, and effectively managing pain. It helps to restore the body’s stability and weight-bearing capacity, which are significantly impacted by the fracture.

What are the typical phases of rehabilitation for a pelvic fracture?

Rehabilitation typically progresses through four phases: acute immobilization (0-4 weeks), mobility recovery with partial weight-bearing (4-8 weeks), muscle strengthening and full weight-bearing (8-12 weeks), and finally, return to daily and sports activities (beyond 3 months). Each phase is meticulously designed to ensure a safe and effective recovery.

How long does it usually take to start walking again after a pelvic fracture?

The ability to start walking again depends on the fracture’s severity and the individual’s progress through rehabilitation. Partial weight-bearing typically begins in Phase 2 (4-8 weeks), with full weight-bearing targeted for Phase 3 (8-12 weeks) under the guidance of your physical therapist.

What are the common causes of a pelvic fracture?

Pelvic fractures can result from high-energy trauma, such as car accidents or falls from height, especially in young and healthy individuals. They can also occur due to low-energy trauma, known as fragility fractures, in individuals with weakened bones, or as avulsion fractures.

Can a pelvic fracture heal without surgery?

Yes, some pelvic fractures can heal without surgery through conservative treatment, which involves immobilization and a structured physiotherapy program. The decision for conservative versus surgical treatment depends on the fracture’s type, stability, and severity, determined by a thorough medical assessment.