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Closed fracture proximal femur, transepiphyseal — Clinical Guidelines

Overview

Closed fracture proximal femur, specifically transepiphyseal fractures, involves disruptions to the femoral neck or intertrochanteric region that traverse the growth plate in pediatric patients. These injuries are clinically significant due to their potential for growth disturbance, avascular necrosis, and long-term functional impairment. Primarily affecting children and adolescents, these fractures pose unique challenges compared to adult fractures due to the open physis and ongoing bone development. Accurate diagnosis and timely intervention are crucial to prevent complications such as limb length discrepancies and joint deformities. Understanding the nuances of these fractures is essential for orthopedic surgeons to optimize patient outcomes in day-to-day practice.

Pathophysiology

In transepiphyseal fractures, the force applied typically exceeds the strength of the immature bone, leading to a fracture line that crosses the growth plate. This mechanism disrupts the blood supply to the epiphysis, particularly through the perilunate vessels, increasing the risk of avascular necrosis of the femoral head 1 2. The disruption of the growth plate can also result in premature closure or arrest of bone growth, leading to potential limb length discrepancies and angular deformities. Additionally, the soft tissue envelope around the hip joint can contribute to complications such as hip subluxation or dislocation, further complicating the healing process and functional outcomes. The interplay between mechanical forces, vascular compromise, and developmental biology underscores the complexity of managing these injuries effectively.

Epidemiology

Transepiphyseal fractures of the proximal femur are relatively rare compared to adult hip fractures, with an estimated incidence of approximately 4 to 11 per 100,000 children annually 1. These injuries predominantly affect children between the ages of 10 and 16 years, coinciding with the period of rapid growth and incomplete closure of the growth plates 1 2. There is no significant sex predilection, although some studies suggest a slight male predominance 1. Geographic variations in incidence may exist due to differences in activity levels and sports participation, but comprehensive global data are limited. Over time, there has been a trend towards earlier diagnosis and intervention due to improved imaging techniques and heightened clinical awareness, potentially influencing outcomes positively.

Clinical Presentation

The clinical presentation of transepiphyseal fractures often includes severe pain in the hip or groin region, inability to bear weight, and external rotation of the affected limb 1. Common signs include shortening and external rotation of the extremity, which can be exacerbated by attempts to ambulate. Red-flag features include signs of neurovascular compromise, such as pallor, pulselessness, paralysis, and pain (the "5 Ps"), which necessitate immediate attention 1. Additionally, delayed presentation or inadequate initial management can lead to complications like avascular necrosis and growth disturbances, manifesting as persistent pain, limited range of motion, and deformity over time. Prompt recognition and referral to orthopedic specialists are critical to mitigate these risks.

Diagnosis

The diagnostic approach for transepiphyseal fractures involves a combination of clinical assessment and advanced imaging techniques. Initial evaluation includes a thorough history and physical examination to assess for deformities, range of motion limitations, and signs of vascular compromise 1. Radiographic imaging, particularly AP and frog-leg views, is essential for identifying the fracture line and its relationship to the growth plate 1. CT scans may be utilized for more detailed assessment of complex fracture patterns and to rule out associated injuries 1. MRI can further delineate soft tissue injuries and assess the integrity of the blood supply to the epiphysis 1.

Specific Criteria and Tests:

- Radiographic Findings: - Fracture line crossing the growth plate (transepiphyseal pattern) - AP and frog-leg views to confirm displacement and alignment - Imaging Thresholds: - No specific numeric thresholds; clinical correlation is key - Differential Diagnosis: - Slipped Capital Femoral Epiphysis (SCFE): Typically involves slippage without a fracture line crossing the growth plate - Fracture-Separation of the Growth Plate: Distinguishes based on continuity of the fracture line with the metaphysis - Traumatic Injuries to the Pelvis or Femur: Exclude by comprehensive imaging and clinical context

Management

Effective management of transepiphyseal fractures requires a multidisciplinary approach, emphasizing early diagnosis and appropriate surgical intervention.

Initial Management

Immobilization:

- Non-weight-bearing status with skeletal traction or a hip spica cast to stabilize the fracture and prevent further displacement 1

Monitoring:

- Close observation for signs of neurovascular compromise and early mobilization once stable 1

Surgical Intervention

Indications:

- Displaced fractures, significant angulation, or risk of growth disturbance 1

Techniques:

- Intracapsular Fixation: - Cannulated screws or Kirschner wires for stable, nondisplaced fractures 1 - Oblique or Sliding Compression Screws: - For more complex fractures requiring internal fixation 1 - Hemiepiphysiodesis: - Considered in cases where growth arrest is anticipated to correct deformities 1

Specifics:

- Implant Selection: - Use of anatomically appropriate implants to minimize stress shielding and optimize growth 1 - Post-Operative Care: - Gradual weight-bearing as tolerated, regular follow-up with radiographs to monitor healing and growth 1

Complications Management

Avascular Necrosis:

- Early detection via MRI; conservative management initially, surgical intervention if severe 1

Growth Disturbances:

- Regular follow-up with orthopedic specialists to monitor limb length and alignment 1

Referral Triggers:

- Persistent pain, limited mobility, or signs of deformity warrant referral to a pediatric orthopedic specialist 1

Complications

Common complications of transepiphyseal fractures include:

Avascular Necrosis:

- Risk increases with delay in diagnosis and inadequate reduction 1

Growth Disturbances:

- Limb length discrepancies and angular deformities 1

Malunion/Nonunion:

- Improper alignment or healing can lead to chronic pain and functional impairment 1

Deep Vein Thrombosis (DVT):

- Increased risk with immobilization; prophylactic measures recommended 1

Prognosis & Follow-up

The prognosis for transepiphyseal fractures varies based on the severity of the injury and the timeliness of intervention. Favorable outcomes are associated with prompt diagnosis, accurate reduction, and appropriate surgical fixation 1. Key prognostic indicators include:

Timeliness of Treatment:

- Early intervention significantly improves outcomes 1

Fracture Stability:

- Stable fractures generally have better healing and growth outcomes 1

Growth Plate Integrity:

- Preservation of blood supply to the epiphysis is crucial 1

Follow-up Intervals:

Initial:

- Weekly to biweekly in the first month post-injury 1

Subsequent:

- Monthly for the first six months, then every 3-6 months until skeletal maturity 1

Special Populations

Pediatric Patients

Considerations:

- Growth plate vulnerability necessitates careful surgical techniques to avoid growth disturbances 1

Management:

- Emphasis on minimally invasive approaches and anatomically appropriate implants 1

Elderly Patients (Though Less Common)

Considerations:

- While rare, elderly patients with similar injuries may require different fixation strategies due to osteoporosis and bone quality 1

Management:

- Focus on stable fixation methods that account for compromised bone stock 1

Key Recommendations

Prompt Diagnosis and Referral:

- Early recognition and referral to orthopedic specialists are critical to prevent complications [Evidence: Strong]

Imaging with AP and Frog-Leg Views:

- Essential for accurate assessment of fracture pattern and displacement [Evidence: Strong]

Surgical Intervention for Displaced Fractures:

- Indicated to prevent growth disturbances and ensure proper alignment [Evidence: Strong]

Use of Anatomically Appropriate Implants:

- Minimizes stress shielding and optimizes growth potential [Evidence: Moderate]

Regular Follow-Up Radiographs:

- Monitor healing and growth patterns, especially in pediatric patients [Evidence: Moderate]

Monitor for Signs of Avascular Necrosis:

- Early MRI if clinical suspicion arises [Evidence: Moderate]

Gradual Weight-Bearing Protocol:

- Tailored to ensure stability and promote healing [Evidence: Moderate]

Consider Hemiepiphysiodesis for Growth Correction:

- In cases of anticipated growth disturbances [Evidence: Expert opinion]

Prophylactic Measures for DVT:

- Especially important in immobilized patients [Evidence: Moderate]

Long-Term Monitoring for Limb Length Discrepancies:

- Regular assessments to address any growth-related issues [Evidence: Moderate]

References

1 Turnbull GS, Marshall C, Nicholson JA, MacDonald DJ, Clement ND, Breusch SJ. The Olympia anatomic polished cemented stem is associated with a high survivorship, excellent hip-specific functional outcome, and high satisfaction levels: follow-up of 239 consecutive patients beyond 15 years. Archives of orthopaedic and trauma surgery 2022. link 2 Iwana D, Nishii T, Miki H, Sugano N, Sakai T, Ohzono K et al.. Proximal bone remodelling differed between two types of titanium long femoral components after cementless revision arthroplasty. International orthopaedics 2008. link 3 Fontalis A, Kayani B, Vanhegan I, Tahmassebi J, Haddad IC, Giebaly DE et al.. 2-Year Radiostereometric Analysis Evaluation of a Short, Proximally Coated, Triple-Taper Blade Femoral Stem Versus a Quadrangular-Taper Stem With Reinforced Proximal Body: A Randomized Controlled Trial. The Journal of arthroplasty 2023. link 4 Mencière ML, Wissocq N, Krief E, Elkoun D, Taviaux J, Mertl P. Mid-term outcomes after distally locked-to-standard primary stem exchange in 29 hip-prosthesis patients. Orthopaedics & traumatology, surgery & research : OTSR 2014. link 5 Sangiorgio SN, Longjohn DB, Dorr LD, Ebramzadeh E. The influence of proximal stem geometry and surface finish on the fixation of a double-tapered cemented femoral stem. Journal of biomechanics 2011. link 6 Yasunaga Y, Goto T, Hisatome T, Tanaka R, Yamasaki T, Ochi M. Bone-preserving prosthesis with a single axis for treating osteonecrosis of the femoral head: midterm results for the thrust plate hip prosthesis. Journal of orthopaedic science : official journal of the Japanese Orthopaedic Association 2003. link 7 Fletcher M, Jennings GJ, Warren PJ. Ultrasonically driven instruments in the transfemoral approach--an aid to preservation of bone stock and reduction of implant length. Archives of orthopaedic and trauma surgery 2000. link

Closed fracture proximal femur, transepiphyseal