Proximal Femoral Fractures: Symptoms, Diagnosis, Treatment & Recovery

Introduction & Epidemiology

Proximal femoral fractures (PFFs) represent a spectrum of osseous injuries involving the proximal femur, spanning from the femoral head-neck junction to the region 5 cm distal to the lesser trochanter. These fractures are broadly categorized into femoral neck, intertrochanteric, and subtrochanteric fractures, each with distinct anatomical, biomechanical, and clinical implications. The etiology commonly involves low-energy falls in osteoporotic older adults, though high-energy trauma (e.g., motor vehicle collisions) can cause complex PFFs in younger, often polytraumatized, individuals.

The global incidence of PFFs is substantial and increasing due to an aging population, with projections indicating over 6 million cases annually by 2050. PFFs are associated with significant morbidity, including prolonged hospitalization, loss of independence, and chronic pain, as well as considerable mortality, with reported rates ranging from 14% to 36% within one year post-injury. The socioeconomic burden is immense, encompassing healthcare costs, rehabilitation expenses, and lost productivity.

Classification systems are crucial for guiding treatment and predicting outcomes. For femoral neck fractures, the Garden classification (Stages I-IV) assesses displacement and impaction, correlating with the risk of avascular necrosis (AVN). The Pauwels classification (Type I-III) describes the angle of the fracture line relative to the horizontal plane, indicating the shear forces and inherent stability. Intertrochanteric and subtrochanteric fractures are often classified using the comprehensive AO/OTA Fracture and Dislocation Classification System , which details fracture location, comminution, and stability, aiding in surgical planning.

Surgical Anatomy & Biomechanics

A thorough understanding of the proximal femoral anatomy and its biomechanical properties is paramount for successful fracture management.

Surgical Anatomy

• Proximal Femur: Comprises the femoral head, neck, greater trochanter, lesser trochanter, and the subtrochanteric region.
  • Femoral Head: Articulates with the acetabulum, covered by articular cartilage.
  • Femoral Neck: Connects the head to the shaft, characterized by a complex trabecular pattern designed to withstand compressive and tensile forces. The neck-shaft angle typically ranges from 120-135 degrees.
  • Greater Trochanter: Lateral prominence, attachment site for the gluteus medius and minimus (abductors) and piriformis.
  • Lesser Trochanter: Medial and posterior prominence, insertion point for the iliopsoas (hip flexor and external rotator).
  • Intertrochanteric Line/Crest: Connects the greater and lesser trochanters, serving as an attachment for the vastus lateralis and parts of the hip capsule.
  • Subtrochanteric Region: Extends approximately 5 cm distal to the lesser trochanter, characterized by dense cortical bone.
• Vascular Supply:
  • Femoral Head: Primarily supplied by the medial circumflex femoral artery (MCFA) and lateral circumflex femoral artery (LCFA) through their retinacular branches ascending along the femoral neck capsule. The artery of the ligamentum teres (foveal artery) provides a variable, often minor, contribution, especially in adults. Femoral neck fractures, particularly displaced ones, can disrupt these critical retinacular vessels, leading to a high incidence of AVN.
• Nerve Supply:
  • The femoral nerve supplies the anterior thigh musculature and sensation.
  • The sciatic nerve supplies the posterior thigh and most of the leg and foot.
  • The superior gluteal nerve innervates the gluteus medius and minimus.
  • The obturator nerve supplies the adductor muscles.
  • Understanding nerve locations is critical to avoid iatrogenic injury during surgical approaches (e.g., superior gluteal nerve risk during trochanteric entry for IMN, femoral nerve risk during anterior approaches).
• Muscle Attachments: The powerful muscles attached to the proximal femur (glutei, iliopsoas, adductors, vasti) create significant deforming forces upon fracture, making reduction challenging, particularly in subtrochanteric fractures.
• Capsule and Ligaments: The hip joint capsule, reinforced by iliofemoral, pubofemoral, and ischiofemoral ligaments, provides significant stability. Integrity of the posterior capsule is crucial for stability in posterior approaches to arthroplasty.

Biomechanics

• Bone Quality: Osteoporosis significantly reduces bone mineral density and architectural integrity, predisposing to fracture with minimal trauma and compromising implant fixation.
• Loading Patterns: The proximal femur is subjected to complex physiological loads, including compressive forces during weight-bearing and tensile forces from muscle pull. The intricate trabecular architecture (e.g., Ward's triangle, primary compressive and tensile groups) is optimized to distribute these forces.
• Fracture Stability:
  • Femoral Neck: Pauwels classification directly relates to shear forces across the fracture plane. A steeper angle (Type III) indicates higher shear forces and instability, requiring more robust fixation or arthroplasty.
  • Intertrochanteric: Stable fractures typically involve intact medial cortical support, allowing load sharing. Unstable patterns (e.g., reverse obliquity, posteromedial comminution, lateral wall insufficiency) shift load entirely to the implant, increasing the risk of failure.
  • Subtrochanteric: Highly unstable due to strong deforming muscle forces (iliopsoas flexion/external rotation, abductor abduction, adductor adduction). The dense cortical bone makes reaming challenging but provides strong purchase for implants.
• Implant Biomechanics:
  • Dynamic Hip Screw (DHS): Functions as a sliding hip screw, allowing controlled impaction at the fracture site under physiological loading, promoting secondary bone healing. Effective for stable intertrochanteric fractures.
  • Cephalomedullary Nail (CMN): Acts as a load-sharing device, providing robust intramedullary fixation. Ideal for unstable intertrochanteric and all subtrochanteric fractures, resisting bending, shear, and rotational forces. The Tip-Apex Distance (TAD) is a critical radiographic parameter influencing cutout risk.
  • Cannulated Screws (CS): Provide compression and rotational stability for undisplaced/minimally displaced femoral neck fractures. Pure load-bearing devices, prone to failure if significant shear forces are present.
  • Arthroplasty: Replaces the fractured segment, allowing immediate weight-bearing and eliminating the risks of AVN and nonunion associated with internal fixation.

Indications & Contraindications

The decision-making process for managing proximal femoral fractures involves careful consideration of fracture characteristics, patient comorbidities, functional status, and surgical goals. Most PFFs in functionally active patients warrant surgical intervention.

Operative Indications

• Femoral Neck Fractures:
  • Undisplaced (Garden I, II): Internal fixation with cannulated screws (CS) in young, active patients to preserve the femoral head. In older, lower-demand patients, CS or arthroplasty may be considered based on bone quality and surgeon preference.
  • Displaced (Garden III, IV):
    • Young/Physiologically Active Patients (<60-65 years): Emergent anatomical reduction and stable internal fixation (CS or DHS/CMN). Priority is femoral head preservation despite high risks of AVN and nonunion.
    • Elderly/Low-Demand Patients (>60-65 years with comorbidities): Arthroplasty (hemiarthroplasty or total hip arthroplasty) is generally preferred due to superior functional outcomes and lower reoperation rates compared to internal fixation.
• Intertrochanteric Fractures:
  • All displaced and unstable fractures (AO/OTA 31-A1, A2, A3):
    • Stable Patterns (31-A1, certain A2): Dynamic hip screw (DHS) or cephalomedullary nail (CMN).
    • Unstable Patterns (31-A2 with posteromedial comminution, lateral wall breach; 31-A3 reverse obliquity): Cephalomedullary nailing (CMN) is the preferred treatment due to its superior biomechanical stability and reduced lever arm compared to extramedullary devices.
• Subtrochanteric Fractures (AO/OTA 32-A/B/C):
  • All displaced fractures: Intramedullary nailing (IMN) with a long nail extending across the fracture site is the gold standard. Plate fixation (e.g., LCP/LISS) may be considered for highly comminuted patterns not amenable to nailing, or specific periprosthetic fractures.

Non-Operative Indications

Non-operative management is reserved for a select few patients where the risks of surgery outweigh the potential benefits.

• Minimally Displaced/Impacted Femoral Neck Fractures: In non-ambulatory, bedridden, or moribund patients whose baseline functional status would not be improved by surgery.
• Prohibitive Medical Comorbidities: Patients with severe, life-threatening medical conditions (e.g., uncontrolled sepsis, recent myocardial infarction, severe cardiorespiratory failure) that render surgery exceedingly high-risk. Palliative care with symptomatic management is often pursued.
• Palliative Care: Patients with a very limited life expectancy where comfort and pain management are the primary goals.

Contraindications (Relative)

• Severe Local Infection: Active infection at the surgical site.
• Extreme Osteoporosis: Bone stock so poor that no implant can achieve stable fixation.
• Lack of Functional Benefit: Patients unlikely to regain any meaningful function or experience improved quality of life despite surgical intervention.

Summary Table: Operative vs. Non-Operative Indications

Pre-Operative Planning & Patient Positioning

Meticulous pre-operative planning is essential for optimizing surgical outcomes and minimizing complications.

Pre-Operative Evaluation

1. Comprehensive Medical Workup:
   • Cardiovascular/Pulmonary Assessment: Consultations with cardiology, internal medicine, or pulmonary specialists are common for older patients with comorbidities. Optimization of cardiac function, respiratory status, and diabetes control is critical.
   • Renal Function: Assessment for appropriate drug dosing and contrast studies.
   • Nutritional Status: Malnutrition is common in elderly fracture patients and can impair healing and increase infection risk.
   • Anemia: Pre-operative correction of significant anemia may be necessary.
   • Medication Review: Identification of anticoagulants/antiplatelets requiring reversal or bridging, and other medications impacting surgery or anesthesia.
2. Imaging Review:
   • Standard Radiographs: AP pelvis, AP and lateral views of the affected hip are mandatory. Assessment of fracture pattern, displacement, comminution, and bone quality.
   • Computed Tomography (CT) Scan: Indicated for complex fracture patterns (e.g., subtrochanteric, periprosthetic), articular involvement (femoral head), or to rule out occult fractures when plain radiographs are equivocal. Useful for assessing posterior comminution in intertrochanteric fractures.
   • Magnetic Resonance Imaging (MRI): Seldom used acutely for diagnosis but can identify occult fractures (e.g., Garden I femoral neck fractures missed on X-ray) or assess for pre-existing AVN.
3. Templating:
   • Using digital or physical templates with calibrated radiographs to estimate implant size (nail length/diameter, lag screw length, head size for arthroplasty), determine neck-shaft angle, and plan for leg length and offset restoration. This anticipates surgical needs and reduces operative time.
4. Informed Consent: Detailed discussion with the patient and/or family regarding the planned procedure, potential alternatives, expected outcomes, and all associated risks and complications.

Patient Positioning

• Supine on Fracture Table: This is the most common position for intramedullary nailing (IMN) and dynamic hip screw (DHS) fixation.
  • Setup: The affected leg is placed in traction via a boot or ankle strap, allowing for longitudinal traction, abduction/adduction, and internal/external rotation maneuvers for fracture reduction. The well leg is typically flexed and abducted on a well-leg holder to allow unimpeded fluoroscopy access from the contralateral side.
  • Perineal Post: Applied to provide counter-traction, but care must be taken to prevent perineal nerve compression or skin breakdown.
  • Fluoroscopy: Crucial for reduction and implant placement. The C-arm must have unrestricted access to obtain AP and lateral views of the proximal femur.
  • Advantages: Excellent reduction control with traction, good fluoroscopic visualization, ease of maintaining sterility.
  • Disadvantages: Potential for iatrogenic nerve palsy (peroneal, pudendal), skin pressure injuries, difficulty accessing the posterior aspect of the hip.
• Supine on Standard Operating Table: For total hip arthroplasty (THA) or hemiarthroplasty (HA) via a direct anterior approach (DAA).
  • Setup: Patient is supine, often with a bump under the ipsilateral hip for optimal exposure.
  • Advantages: Minimal muscular disruption, theoretically lower dislocation rates (though debated), easier leg length assessment.
  • Disadvantages: Requires specialized instrumentation and training, limited exposure for complex fractures, potential for femoral nerve neuropraxia.
• Lateral Decubitus Position: Preferred for THA/HA via the posterior or anterolateral (Watson-Jones) approach. Also used for some open reduction and internal fixation (ORIF) cases with plating.
  • Setup: Patient is positioned on their unaffected side, secured with beanbag or vacuum mattress. Adequate padding of bony prominences (e.g., axilla, dependent knee, malleoli) is crucial.
  • Advantages: Excellent exposure for the posterior and lateral hip, allowing good control of reduction and implant placement for arthroplasty.
  • Disadvantages: Potential for brachial plexus injury, pressure sores on the dependent side, may require more assistance for patient positioning.

Ancillary Measures

• Antibiotic Prophylaxis: Administer pre-operatively according to institutional protocols (typically a first- or second-generation cephalosporin) to reduce surgical site infection risk.
• Deep Vein Thrombosis (DVT) Prophylaxis: Mechanical (sequential compression devices) and pharmacological (heparin, LMWH) prophylaxis initiated pre-operatively and continued post-operatively.
• Blood Availability: Cross-match blood products as needed, especially for unstable fractures or arthroplasty.

Detailed Surgical Approach / Technique

Surgical treatment of proximal femoral fractures varies significantly based on fracture type, displacement, patient factors, and surgeon preference. The common theme across all techniques is achieving acceptable reduction followed by stable internal fixation or arthroplasty.

General Principles of Fracture Reduction and Fixation

1. Reduction:
   • Closed Reduction: Primarily achieved using traction, rotation, abduction/adduction maneuvers on a fracture table under fluoroscopic guidance. This is the goal for most IMN and DHS procedures.
   • Open Reduction: Required when closed reduction is unattainable or unacceptable. Involves direct visualization and manipulation of fracture fragments through a surgical incision, often using reduction clamps, K-wires, or joysticks.
2. Maintenance of Reduction: Temporary fixation with K-wires or clamps is often necessary while definitive implants are placed.
3. Stable Fixation: Choice of implant and meticulous application to withstand physiological loads, promote bone healing, and allow early mobilization.

Specific Fracture Types & Techniques

1. Femoral Neck Fractures

• Undisplaced/Minimally Displaced (Garden I/II): Cannulated Screws (CS)
  • Indications: Gold standard for young, active patients; often suitable for elderly with good bone stock and stable impaction.
  • Positioning: Supine on fracture table.
  • Approach: Small lateral incision(s) over the proximal femur.
  • Technique:
    1. Achieve anatomical reduction (typically by internal rotation, slight abduction, and traction). Confirm on AP and lateral fluoroscopy.
    2. Insert three or four 3.2 mm guide wires for cannulated screws. The ideal configuration is an inverted triangle: two inferior screws parallel to the anterior cortex and one superior screw parallel to the posterior cortex. Alternatively, a diamond or square pattern for improved purchase in osteoporotic bone.
    3. Guide wires should cross the fracture site and terminate 5-10 mm from the subchondral bone of the femoral head. Confirm position with AP and lateral fluoroscopy (ensure no articular penetration).
    4. Measure screw lengths, pre-drill (optional for cancellous bone), and insert cannulated screws. Ensure proper compression across the fracture site.
    5. Check final reduction and stability under fluoroscopy.
  • Pitfalls: Inadequate reduction, articular penetration, insufficient screw length/number, loss of fixation in osteoporotic bone.
• Displaced (Garden III/IV):
  • Young/Physiologically Young Patients: Open Reduction and Internal Fixation (ORIF) with CS or DHS/CMN.
    • Approach: Anterolateral (Watson-Jones) or direct lateral approach may be required for open reduction.
    • Technique: Similar to CS fixation, but often requires open reduction. DHS or CMN can be used, particularly if comminution or poor bone quality suggests CS might fail. High risk of AVN and nonunion.
  • Elderly/Low-Demand Patients: Arthroplasty
    • Hemiarthroplasty (HA):
      • Indications: Most common for displaced femoral neck fractures in elderly patients. Can be unipolar (single component, articulates with native acetabulum) or bipolar (two components, inner head articulates with outer shell, which articulates with acetabulum). Bipolar theoretically reduces acetabular wear but clinical superiority is debated.
      • Approach: Posterior (Moore) or Anterolateral (Watson-Jones) are most common. Direct Anterior (Hueter) also used.
      • Technique (Posterior Approach):
        1. Lateral decubitus position. Incision centered over the greater trochanter, extending proximally and distally.
        2. Dissection through subcutaneous tissue, fascia lata. Split gluteus maximus fibers.
        3. Identify short external rotators (piriformis, gemelli, obturators, quadratus femoris) and sciatic nerve.
        4. Detach short external rotators and capsule from posterior aspect of greater trochanter and femur. Retract anteriorly to expose femoral neck.
        5. Osteotomize femoral neck (typically 1 finger breadth above lesser trochanter). Remove femoral head.
        6. Prepare femoral canal: progressive reaming and broaching to size for prosthetic stem.
        7. Trial reduction. Assess leg length, offset, and stability.
        8. Insert definitive femoral stem (cemented or uncemented).
        9. Reduce femoral component into acetabulum. Repair capsule and short external rotators.
    • Total Hip Arthroplasty (THA):
      • Indications: For active elderly patients with displaced femoral neck fractures and pre-existing symptomatic hip arthritis, or those with significant concerns for future acetabular wear. Offers superior functional outcomes compared to HA in selected patients.
      • Technique: Similar approaches and femoral preparation as HA. Additionally involves preparing the acetabulum (reaming) and implanting an acetabular cup (cemented or uncemented) with a liner, followed by reduction of the femoral head into the new cup.

2. Intertrochanteric Fractures

• Dynamic Hip Screw (DHS) / Sliding Hip Screw:
  • Indications: Stable intertrochanteric fractures (e.g., AO 31-A1, some 31-A2 patterns with intact lateral wall).
  • Positioning: Supine on fracture table.
  • Approach: Direct lateral incision from just proximal to the greater trochanter, extending distally 10-15 cm. Incise fascia lata, split vastus lateralis muscle longitudinally.
  • Technique:
    1. Achieve closed reduction using traction, internal rotation, and adduction. Confirm on AP and lateral fluoroscopy. Restore neck-shaft angle and obtain medial cortical opposition.
    2. Identify entry point for guide wire: typically 1-2 cm proximal to the vastus lateralis ridge, in line with the femoral shaft axis.
    3. Insert 2.5 mm guide wire into the center of the femoral head on AP view and center/anterior on lateral view. The guide wire should be 1-2 cm from the subchondral bone. Crucial parameter: Tip-Apex Distance (TAD) < 25 mm.
    4. Measure screw length. Triple ream the femoral neck (pilot reamer, lag screw reamer, barrel reamer).
    5. Insert lag screw to desired depth.
    6. Position the DHS plate barrel over the lag screw, then secure the plate to the lateral femoral cortex with cortical screws. Ensure proper alignment and rotation.
    7. Apply compression across the fracture site by engaging the lag screw within the barrel.
    8. Consider an anti-rotation screw if a derotational screw is available in the system, or for highly unstable fractures.
  • Pitfalls: Inadequate reduction, screw cutout (high TAD), lateral wall fracture (especially when reaming for barrel), Z-effect/reverse Z-effect with multi-hole lag screws.
• Cephalomedullary Nail (CMN) / Intramedullary Nail (IMN):
  • Indications: Gold standard for unstable intertrochanteric fractures (e.g., reverse obliquity 31-A3, comminuted 31-A2 with lateral wall deficiency), subtrochanteric extension, osteoporotic bone.
  • Positioning: Supine on fracture table.
  • Approach: Proximal lateral incision (5-8 cm) over the tip of the greater trochanter or slightly medial for piriformis entry.
  • Technique:
    1. Achieve closed reduction (traction, internal rotation, adduction) under fluoroscopy.
    2. Entry Point:
       • Trochanteric Tip: Ideal for most nail designs. A lateral fluoroscopic view guides placement.
       • Piriformis Fossa: More medial entry, carries higher risk of superior gluteal nerve injury and avascular necrosis of the femoral head (rare but reported). Less commonly used.
    3. Cannulate the entry point with an awl or drill. Ream the proximal femur to the appropriate nail diameter (or use an unreamed technique).
    4. Insert the chosen CMN (e.g., Gamma, TFN, PFNA, Intertan) carefully into the femoral canal. Ensure it crosses the fracture site and is well-seated.
    5. Proximal Locking (Cephalic Screws/Blade):
       • Insert one or two lag screws or a helical blade into the femoral head. Confirm position (center-center in AP, center-anterior in lateral) and depth (5-10 mm from subchondral bone). Crucial: TAD < 25 mm.
    6. Distal Locking: Apply distal locking screws (static or dynamic) through the targeting guide. Confirm position and length on fluoroscopy.
    7. Perform final check of reduction and implant position on AP and lateral views.
  • Pitfalls: Varus malreduction, inadequate entry point (can lead to malalignment or iatrogenic fracture), difficult distal locking, trochanteric pain (proximal nail prominence), cutout (high TAD), lag screw migration, Z-effect/reverse Z-effect with dual screws.

3. Subtrochanteric Fractures

• Intramedullary Nailing (IMN):
  • Indications: Gold standard for nearly all subtrochanteric fractures.
  • Positioning: Supine on fracture table.
  • Approach: Proximal lateral incision over the greater trochanter.
  • Technique:
    1. Reduction Challenges: Subtrochanteric fractures are notoriously difficult to reduce due to strong deforming muscle forces (iliopsoas on proximal fragment, abductors, adductors). Traction, internal rotation, and often direct manipulation (e.g., large pointed reduction clamps, "joysticks" into fragments) are needed. Some cases may require a mini-open approach.
    2. Entry Point: Critical to avoid varus malreduction. Typically at the tip of the greater trochanter or slightly medial, allowing for an anatomical nail path.
    3. Reaming: Ream the femoral canal to the appropriate diameter, often over a guide wire.
    4. Nail Insertion: Carefully advance a long IMN (extending distally past the fracture site by several cm) across the fracture.
    5. Proximal Locking: Use a targeting guide to place cephalic screws into the femoral head and neck to prevent proximal fragment rotation and varus collapse.
    6. Distal Locking: Perform static distal locking using the targeting guide or freehand technique. Two distal screws are typically used for enhanced stability.
    7. Confirm reduction and implant position on fluoroscopy.
  • Pitfalls: Malreduction (especially in varus), entry point violation, iatrogenic comminution during nail insertion, nonunion, hardware failure due to high stress, difficulty with distal locking.
• Plate Fixation (e.g., LCP, LISS):
  • Indications: Selected cases where IMN is not feasible (e.g., extremely wide canal, specific periprosthetic fractures, fractures extending into the greater trochanter preventing nail seating, failed IMN).
  • Approach: Direct lateral or minimally invasive percutaneous techniques.
  • Technique: Open or limited open reduction, followed by application of a long, pre-contoured locking plate (LCP, LISS). Requires meticulous screw placement into both proximal and distal fragments, often bypassing comminuted zones.
  • Pitfalls: Extensive soft tissue stripping, increased infection risk, potential for stress risers at plate ends, longer operative time, higher blood loss.

Complications & Management

Proximal femoral fractures and their surgical management are associated with a significant rate of complications, impacting patient outcomes and increasing healthcare burden. Vigilant monitoring and timely intervention are critical.

General Complications (Applicable to all PFFs)

1. Infection:
   • Incidence: Superficial (1-5%), deep (0.5-2%). Higher in open fractures, polymorbid patients, or prolonged surgeries.
   • Management:
     • Superficial: Oral antibiotics, local wound care.
     • Deep (acute < 3-4 weeks): Urgent irrigation and debridement, tissue cultures, intravenous antibiotics. Implant retention if stable.
     • Deep (chronic > 3-4 weeks): Staged revision (implant removal, debridement, antibiotic spacer, prolonged IV antibiotics, then reimplantation). Amputation is rare.
2. Deep Vein Thrombosis (DVT) / Pulmonary Embolism (PE):
   • Incidence: DVT (10-40% without prophylaxis); PE (1-5%). Major cause of post-operative mortality.
   • Management: Prophylaxis is standard. Treatment involves therapeutic anticoagulation. IVC filter for contraindications to anticoagulation or recurrent PE.
3. Hemorrhage/Hematoma:
   • Incidence: Variable, increased with extensive dissection or anticoagulation.
   • Management: Hemostatic control intraoperatively, drains if indicated, blood transfusion. Evacuation of large, symptomatic hematomas.
4. Nerve Injury:
   • Incidence: < 1%, but varies by approach. Sciatic nerve (posterior approach), femoral nerve (anterior approach, traction table), superior gluteal nerve (piriformis entry for IMN), lateral femoral cutaneous nerve (anterior/anterolateral approach).
   • Management: Prevention through careful dissection and positioning. Most are neuropraxias and resolve spontaneously. Nerve exploration for persistent deficits.
5. Malunion/Nonunion:
   • Incidence: Nonunion: 10-20% (femoral neck), 5-10% (intertrochanteric/subtrochanteric). Malunion: Varies, often related to technical errors or severe comminution.
   • Management:
     • Nonunion: Revision ORIF with bone grafting (autograft/allograft), exchange nailing, corrective osteotomy, conversion to arthroplasty (for femoral neck), compression plating.
     • Malunion: Often observed if functional. Corrective osteotomy for significant deformity (e.g., varus, rotation) causing pain or functional impairment.
6. Hardware Failure:
   • Incidence: 5-10%, device-specific. Often associated with nonunion or inadequate fixation.
   • Management: Revision with stronger/different implant, exchange nailing, bone grafting if nonunion is present.

Specific Complications for Each Technique

• Cannulated Screws (Femoral Neck):
  • Avascular Necrosis (AVN) of Femoral Head: 10-30% in displaced fractures. Management: Core decompression (early), vascularized fibula graft (selected cases), hemiarthroplasty/THA.
  • Loss of Reduction/Screw Cutout: Due to osteoporotic bone or inadequate fixation. Management: Revision to arthroplasty or more stable fixation.
• Dynamic Hip Screw (DHS):
  • Screw Cutout/Z-effect/Reverse Z-effect: Lag screw migrates superiorly or inferiorly from the femoral head, often due to high TAD or unstable fracture. Management: Conversion to arthroplasty (if femoral head compromised), revision with CMN (if fracture still reducible and bone stock allows).
  • Lateral Wall Blowout: Fracture of the lateral femoral cortex during reaming or screw insertion. Can lead to implant collapse. Management: May require conversion to CMN or augmented fixation.
• Cephalomedullary Nail (CMN):
  • Trochanteric Pain: Common (15-25%) due to nail prominence or irritation of soft tissues. Management: Implant removal after fracture union.
  • Distal Locking Difficulties: Due to targeting guide misalignment or patient size. Can prolong surgery.
  • Lag Screw Migration/Cutout: As with DHS, often related to TAD > 25mm or poor bone quality. Management: Similar to DHS.
• Arthroplasty (Hemiarthroplasty/THA):
  • Dislocation: 2-10%, often within the first few weeks. Risk factors include posterior approach, component malposition, patient non-compliance. Management: Closed reduction; if recurrent, revision surgery (liner exchange, component repositioning, constrained liner).
  • Periprosthetic Fracture: Fracture around the prosthetic components. Management: Often requires open reduction and internal fixation with plates/screws or revision arthroplasty, depending on fracture location and stability of implant.
  • Leg Length Discrepancy: Management: Shoe lift for minor differences; revision for significant, symptomatic discrepancies.
  • Aseptic Loosening: Long-term complication. Management: Revision arthroplasty.

Table: Common Complications and Salvage Strategies

Post-Operative Rehabilitation Protocols

Post-operative rehabilitation is crucial for optimizing functional recovery, preventing secondary complications, and facilitating the patient's return to independence. Protocols are tailored to the type of fracture, surgical fixation, bone quality, and patient's pre-injury functional status.

General Principles

• Pain Management: Multimodal analgesia (opioids, NSAIDs, acetaminophen, nerve blocks) to facilitate early mobilization.
• Early Mobilization: As soon as medically stable, often within 24-48 hours. Reduces risks of DVT/PE, pneumonia, decubitus ulcers, and improves functional recovery.
• Weight-Bearing (WB) Status:
  • Weight-Bearing As Tolerated (WBAT): Typically for stable fixation (e.g., arthroplasty, well-fixed intertrochanteric fractures, undisplaced femoral neck fractures). Patients are allowed to bear as much weight as comfort allows.
  • Protected Weight-Bearing (PWB): Toe-touch weight-bearing (TTWB) or partial weight-bearing (PWB) with crutches or a walker. Prescribed for unstable fractures, comminuted patterns, poor bone quality, or certain femoral neck ORIF, to protect the healing fracture and implant. Progress is based on radiographic signs of union and clinical stability, typically over 6-12 weeks.
• Physical Therapy (PT): Focuses on restoring range of motion (ROM), strengthening surrounding musculature, improving balance, and gait training.
• Occupational Therapy (OT): Addresses activities of daily living (ADLs), functional transfers, and home safety modifications.
• Multidisciplinary Approach: Involves surgeons, physicians, nurses, physical therapists, occupational therapists, social workers, and nutritionists, especially for elderly, frail patients.

Specific Protocols

1. Femoral Neck Fractures

• Cannulated Screws (ORIF):
  • Undisplaced: Often immediate WBAT with assistive devices (walker/crutches).
  • Displaced (after ORIF): Typically TTWB or PWB for 6-12 weeks, progressing to WBAT as callus formation and healing are evident on radiographs. Hip precautions usually not necessary, but care with extreme rotation/flexion may be advised initially.
• Hemiarthroplasty (HA) / Total Hip Arthroplasty (THA):
  • WB Status: Immediate WBAT.
  • Hip Precautions: Essential, especially for posterior approach THA/HA, for 6-12 weeks or permanently depending on surgeon preference and patient risk factors for dislocation.
    • Posterior Approach: Avoid hip flexion > 90°, hip adduction past midline, hip internal rotation.
    • Anterior Approach: Avoid hip extension past neutral, external rotation.
  • PT Progression: Early ROM and strengthening exercises. Gait training with assistive devices. Progression to independence as tolerated.

2. Intertrochanteric Fractures (DHS / CMN)

• Stable Fixation (Good bone quality, minimal comminution): Immediate WBAT with assistive devices.
• Unstable Fixation (Comminuted, lateral wall deficiency, reverse obliquity): Protected WB (TTWB/PWB) for 6-12 weeks. Gradual increase in WB as pain subsides and radiographic signs of healing appear.
• PT Progression: Focus on quadriceps and gluteal strengthening, hip ROM within comfort, balance training.

3. Subtrochanteric Fractures (IMN)

• WB Status: Due to the inherent instability and high deforming forces, protected WB (TTWB/PWB) for 8-12 weeks is common, progressing to WBAT based on radiographic evidence of union.
• PT Progression: Gradual increase in ROM and strengthening. Close monitoring of gait and lower extremity alignment.
• Caution: Higher risk of delayed union/nonunion and hardware failure necessitates a more cautious approach to WB progression.

Outcomes

• Mortality: Ranges from 14-36% at one year post-fracture, significantly higher than age-matched controls.
• Functional Outcomes: Many elderly patients do not return to their pre-injury level of function and independence. Approximately 50% may require long-term care or lose the ability to ambulate independently.
• Pain: While surgery aims to reduce pain, chronic pain can persist in a subset of patients.
• Quality of Life: Often diminished post-fracture, impacted by reduced mobility, pain, and loss of independence.

Summary of Key Literature / Guidelines

Evidence-based guidelines and landmark trials significantly inform the management of proximal femoral fractures.

1. Femoral Neck Fractures:

   • Displaced Femoral Neck Fractures in the Elderly:
     • The HEALTH trial (Hip Fracture Evaluation with Alternatives of Total Hip Arthroplasty versus Hemiarthroplasty) , a large multinational RCT, confirmed that in patients over 50 with displaced femoral neck fractures, total hip arthroplasty (THA) results in better functional outcomes and a lower reoperation rate compared to hemiarthroplasty (HA), albeit with a higher risk of dislocation.
     • The FAITH trial (Fixation using Alternative Techniques in Hip fractures) compared sliding hip screws with multiple cancellous screws for displaced femoral neck fractures. While inconclusive on superiority, it highlighted high reoperation rates for internal fixation in this population, supporting arthroplasty as the preferred treatment for elderly patients.
     • Recommendation: For active, physiologically young elderly patients with displaced femoral neck fractures, THA is increasingly favored over HA or internal fixation due to superior long-term function and lower reoperation rates, despite a slightly higher short-term complication risk (dislocation). For less active or frail elderly, HA remains a viable option.
   • Undisplaced Femoral Neck Fractures:
     • Internal fixation with cannulated screws is the standard. Debate exists whether some Garden I/II fractures in frail, non-ambulatory patients could be managed non-operatively, but surgical fixation generally offers better pain control and early mobilization.

2. Intertrochanteric Fractures:

   • Intramedullary Nailing (IMN) vs. Dynamic Hip Screw (DHS):
     • Numerous systematic reviews and meta-analyses consistently demonstrate that IMN is superior to DHS for unstable intertrochanteric fractures (e.g., reverse obliquity, large posteromedial comminution, lateral wall insufficiency). IMN provides better biomechanical stability, lower rates of implant failure and nonunion, and potentially shorter operative time and less blood loss.
     • For stable intertrochanteric fractures , both DHS and IMN can achieve satisfactory results. The choice often depends on surgeon preference and experience.
     • Recommendation: IMN is the implant of choice for unstable intertrochanteric fractures. For stable patterns, both DHS and IMN are acceptable.
   • Tip-Apex Distance (TAD): Introduced by Baumgaertner et al., TAD is a critical predictor of cutout for cephalomedullary implants. A TAD > 25 mm significantly increases the risk of screw cutout and implant failure.

3. Subtrochanteric Fractures:

   • Intramedullary Nailing (IMN):
     • Consensus across orthopedic literature identifies IMN as the gold standard for the vast majority of subtrochanteric fractures. It functions as a load-sharing device, providing superior biomechanical stability compared to extramedullary plating for these highly unstable fractures.
     • Recommendation: Long IMN with adequate proximal and distal locking is the preferred treatment. Plate fixation is reserved for specific situations like failed IMN or extremely complex patterns not amenable to nailing.

4. General Principles for all PFFs:

   • Timing of Surgery: The "time to surgery" is a critical factor. Current evidence strongly supports performing surgery within 24-48 hours of injury, particularly for elderly patients. Delayed surgery is associated with increased mortality, longer hospital stays, and higher complication rates.
   • Multidisciplinary Care: A comprehensive, multidisciplinary approach involving orthopedics, geriatrics, anesthesia, nursing, and rehabilitation specialists significantly improves outcomes, reduces complications, and enhances functional recovery in elderly PFF patients. This includes optimizing medical comorbidities, nutritional support, and early post-operative mobilization.
   • DVT/PE Prophylaxis: Standardized protocols using mechanical and pharmacological prophylaxis are universally recommended.

In conclusion, the management of proximal femoral fractures demands a sophisticated understanding of anatomy, biomechanics, and evidence-based surgical techniques. Optimal outcomes are achieved through meticulous pre-operative planning, precise execution of the chosen surgical method, aggressive post-operative rehabilitation, and a holistic, multidisciplinary patient care approach.