History of Femoral Neck Fracture Fixation & Evaluation

Historical Timeline

Pre-Operative Era (Before ~1850)

First Fixation Attempts (Late 1800s - Early 1900s)

• 1858: Langenbeck reportedly performed the first nail fixation of a femoral neck fracture, using a large metal nail driven percutaneously
• 1880s-1900s: Various surgeons experimented with bone pegs, ivory pegs, and crude metal nails - largely unsuccessful due to implant failure and infection
• 1902: Whitman introduced a closed reduction technique that was widely adopted before the fixation era

Smith-Petersen Era (1925-1940s)

• 1925: Marius Nygaard Smith-Petersen introduced the triflanged nail - a landmark in fracture fixation. It provided rotational stability and could be driven across the femoral neck into the femoral head
• This was the first consistently reproducible internal fixation device and became the standard for ~30 years
• Required open surgery; infections and implant failure remained common

Sliding/Compression Screw Era (1930s-1950s)

• 1934: Robert Danis (Belgium) designed the forerunner of the Dynamic Hip Screw (DHS)
• 1950s: Ernst Pohl and others refined it; Willis L. Pugh developed the Pugh nail (a sliding nail-plate combination)
• The key concept: allowing controlled impaction/collapse at the fracture site while maintaining alignment
• John Charnley further improved the biomechanics of sliding devices

Multiple Cannulated Screw Era (1960s-2000s)

• 1960s-1970s: Following reports by Garden et al. and Barnes et al., multiple cancellous screw (MCS) configurations became widely used
• Initially screws were placed in various configurations (parallel, triangular, quadrilateral)
• Mid-1980s: Shift toward parallel screws - they allow controlled collapse at the fracture site
• Early 2000s: Biomechanical work by Selvan et al. showed the inverted triangle configuration has greatest resistance to failure - this became the standard technique: 3 partially-threaded cannulated screws (6.5-7.3 mm) in an inverted triangle

Arthroplasty Enters (1950s-1970s)

• Austin Moore (1952) and Fred Thompson introduced metallic femoral head prostheses (hemiarthroplasty) for displaced fractures in elderly patients
• Over time hemiarthroplasty became preferred over internal fixation for displaced fractures in older, physiologically frail patients due to the high rates of avascular necrosis (AVN) and nonunion with fixation
• Total hip arthroplasty (THA) for fracture was introduced in the 1970s-1980s and is now preferred for active, community-ambulating elderly patients

Modern Implant Innovations (2000s-Present)

• Dynamic Hip Screw (DHS) system: still widely used, especially for basicervical and stable fractures
• Proximal Femoral Locking Plates (PFLP)
• Cephalomedullary nails (CMN): for combined neck-shaft fractures
• Femoral Neck System (FNS - DePuy Synthes, ~2018): a single implant combining a sliding bolt with anti-rotation pin - minimally invasive, preserves cortical bone, gaining increasing use especially in younger patients
• Orthopedic surgical robots: improving accuracy of cannulated screw placement
• Biplanar Double Support Screw (BDSF): newer technique accounting for Pauwels angle

Classification Systems (Used in Evaluation)

1. Anatomic Location

• Subcapital (most common, highest risk of AVN)
• Transcervical
• Basicervical (lowest risk of AVN; behaves more like intertrochanteric)

2. Garden Classification (Most Widely Used)

• Clinically, most surgeons simplify this to nondisplaced (I/II) vs displaced (III/IV)
• Interobserver reliability is low across all 4 stages but good for the 2-category grouping
• Limitation: does not account for sagittal plane angulation - Garden I/II with ≥20° sagittal angulation may behave as displaced fractures and should be treated as such

3. Pauwels Classification (1935)

• Originally described in German literature (1935) and misquoted for decades, but the core principle holds
• High Pauwels angle fractures often require augmented fixation (medial buttress plating, valgus osteotomy, or FNS)

Clinical Evaluation

History

• Mechanism: low-energy fall (elderly/osteoporotic) vs. high-energy trauma (young patient)
• In young patients with high-energy injury, always suspect associated injuries (head, pelvis, ipsilateral femoral shaft - "floating hip")
• Stress fractures can present without a traumatic event - insidious groin or thigh pain, often in athletes or patients on bisphosphonates/steroids
• Medical comorbidities: osteoporosis, prior hip pathology, malignancy (pathologic fracture)

Physical Examination

• Classic displaced presentation: limb shortened, externally rotated, and abducted
• Nondisplaced/impacted: patient may still be ambulatory with groin or anterior thigh pain - easy to miss
• Inspection: iliac crest height difference (leg length discrepancy), muscle atrophy
• Palpation: groin tenderness, greater trochanter tenderness
• Range of motion assessment should be deferred in displaced fractures - to avoid further disruption of the blood supply to the femoral head
• Assess distal neurovascular status
• Rule out compartment syndrome if high-energy injury

Radiographic Evaluation

1. AP pelvis - compare both hips; assess trabecular pattern, femoral neck/shaft angle
2. Cross-table lateral hip - assesses posterior comminution and sagittal displacement; critical for predicting fixation failure even in Garden I/II fractures
3. Traction internal rotation view - helps visualize the fracture line more clearly

• "S" and reverse-"S" curves: the concave outline of the femoral neck should meet the convex femoral head outline - failure of this "S-sign" indicates malalignment
• Subcapital cortical line continuity
• Broad band of increased subcapital density (impaction zone)
• Trabecular alignment between femoral head and acetabulum (Garden III vs IV)

• MRI: imaging of choice for occult femoral neck fractures (negative plain X-ray but high clinical suspicion) - detects bone marrow edema and fracture line before cortical disruption is visible
• CT scan: often obtained from trauma workup; useful for degree of comminution, posterior cortex assessment, and ruling out pathologic lesion; also detects missed neck fractures after femoral shaft nailing
• Bone scan (technetium-99m): alternative to MRI for occult fractures when MRI is unavailable; less sensitive acutely (may be false-negative in first 72 hours)
• Gadolinium-enhanced MRI: can assess femoral head perfusion acutely, though not routinely used

Postoperative Radiographic Evaluation

• Immediate post-op: check for missed occult femoral neck fractures (especially after femoral shaft nailing)
• 6 and 12 weeks: standard follow-up; look for early callus formation
• Every 6-8 weeks thereafter until union
• New-onset groin pain at any follow-up = concern for missed femoral neck fracture or AVN - obtain dedicated hip radiographs
• Watch for: hardware migration, varus collapse, cut-out, femoral head osteonecrosis (flattening, subchondral fracture - "crescent sign"), nonunion

Summary: Implant Decision Tree (Modern Practice)

Femoral Neck Fracture
        |
   _____|_____
  |           |
Nondisplaced  Displaced
(Garden I/II) (Garden III/IV)
    |              |
    |         Physiologic age
    |         /           \
    |    Young         Older
    |   (ORIF)      (Arthroplasty)
    |      |          /       \
  ORIF  Cannulated  Hemi-    Total Hip
  (3    screws /    arthroplasty Arthroplasty
  screws) FNS      (lower demand) (community
   or FNS                         ambulator)

• Campbell's Operative Orthopaedics 15th Ed 2026 - Chapter 60, Femoral Neck Fractures
• Rosen's Emergency Medicine 10th Ed - Chapter 47, Femoral Neck Fractures
• Rockwood and Green's Fractures in Adults 10th Ed 2025 - Femoral Neck Chapter
• Bartonicek J, Rammelt S. "The history of internal fixation of proximal femur fractures - Ernst Pohl, the genius behind." Int Orthop 2014;38:2421-2426
• PMC review on fixation techniques for femoral neck fractures

Küntscher G. "Fully automatic nailing of the femoral neck." Z Orthop Ihre Grenzgeb 1953; 84(1):17-28.

Küntscher G. "Das Callusproblem." Langenbecks Arch Chir 1953; 273:835-43.

Küntscher's 1953 Contribution

What He Introduced: The Fully Automatic / Self-Advancing Femoral Neck Nail

• A U-shaped intramedullary nail (~32 cm long) inserted from the apex of the greater trochanter into the femoral shaft
• At a point ~8 cm from the proximal end, the shaft nail contained a hole/slot into which a shorter transverse nail (11.5 cm, double-T profile) was threaded into the femoral neck and head
• The combined construct formed a "Y"-shape - hence the name - addressing both the femoral shaft and neck simultaneously

• The innovation in 1953 was the automatic locking mechanism - once the intramedullary nail was driven down the shaft, the transverse neck nail would engage and lock automatically through the lateral hole, without requiring a separate manual step
• This was conceptually the forerunner of modern reconstruction nails and cephalomedullary nails (e.g., Gamma nail, PFNA, TAN)

Context Within Küntscher's Career Timeline

Also in 1953: Das Callusproblem

Legacy of the 1953 Y-nail

Küntscher Y-nail (1945/1953)
        ↓
Zickel nail (1967) - first purpose-built subtrochanteric nail
        ↓
Gamma nail (1988, Grosse & Taglang)
        ↓
PFNA / TAN / CMN (modern cephalomedullary nails)

Burns 1944 - Honest Assessment

• Campbell's Operative Orthopaedics (15th Ed 2026)
• Rockwood and Green's Fractures in Adults (10th Ed 2025)
• Rosen's Emergency Medicine
• Dedicated historical review literature on femoral neck fracture fixation
• The WikiDoc femoral neck fracture historical timeline

Possible Interpretations

1. B.H. Burns - a name that appears in some British orthopedic literature; possibly related to hip fracture management during or immediately after WWII, when there was significant development in fracture care driven by wartime casualties
2. Context of 1944 - In 1944, the dominant fixation method was still the Smith-Petersen triflanged nail (introduced 1931), with Johansson's guide-pin technique (1932) and multiple-pin methods (Knowles, 1936) also in use. The AAOS had recommended the three-wing nail in 1941. Küntscher's Y-nail was being developed in Germany during this period (1943-1945) but was largely unknown outside Germany during the war
3. Could be a context-specific reference - This might be a reference from a particular textbook, exam, or curriculum you are working from, where "Burns 1944" is cited for a specific contribution (e.g., a classification system, a surgical technique modification, or a review paper)