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Retrograde Femoral Nailing

Surgical technique guide for Retrograde Femoral Nailing - FRCS exam preparation

Core Procedure
intermediate
By OrthoVellum Medical Education Team

Reviewed by OrthoVellum Editorial Team

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High Yield Overview

RETROGRADE FEMORAL NAILING

Infrapatellar approach (medial parapatellar or transpatellar tendon) | intermediate

Mnemonic

R-E-T-R-ORETRO - Indications for Retrograde Nailing

Mnemonic

E-N-T-R-YENTRY - Entry Point Landmarks

Critical Danger Structures

Posterior Cruciate Ligament

PCL. Location: Inserts posterior intercondylar roof. Risk: Entry too posterior damages PCL, creates apex anterior deformity. Protection: Entry 1cm ANTERIOR to PCL, confirm with lateral fluoro anterior to Blumensaat's line.

Anterior Cruciate Ligament

ACL. Location: Anterolateral intercondylar notch. Risk: Eccentric entry or reaming can damage ACL. Protection: Central coronal plane entry, direct visualization of notch, avoid notch impingement with buried nail tip.

Popliteal Artery

Popliteal Artery. Location: Posterior to distal femur, tethered at adductor hiatus and popliteal fossa. Risk: Posterior cortex perforation during reaming, retractor placement, or fracture displacement. Protection: Maintain knee flexion 30-40°, ball-tipped guidewire, AP/lateral fluoro monitoring.

Common Peroneal Nerve

Common Peroneal Nerve. Location: Wraps around fibular neck, vulnerable with lateral approaches/positioning. Risk: Compression from positioning, lateral retractor placement. Protection: Padding around knee, avoid valgus stress on knee, careful lateral screw placement.

Infrapatellar Branch Saphenous Nerve

Infrapatellar Branch of Saphenous Nerve. Location: Crosses medially 1-2cm below patella, variable course. Risk: Medial parapatellar approach cuts nerve branches. Protection: Longitudinal incision in line with tibial tuberosity, minimize medial dissection, patient counseled re: infrapatellar numbness.

FeatureRetrogradeAntegrade
Entry PointIntercondylar notchPiriformis/greater trochanter
PositionSupine, knee flexed 30-40°Lateral or supine with extension table
Best ForDistal 1/3 fracturesProximal/middle 1/3 fractures
PolytraumaPreferred (supine access)Requires lateral positioning
ObesityEasier entryEntry can be very difficult
Bilateral FemursEfficient (no repositioning)Requires repositioning
Knee ComplicationsAnterior knee pain 20-40%Minimal
Hip ComplicationsMinimalAbductor weakness, heterotopic bone
Distal FragmentRequires 4-5cm minimumNot as critical
Proximal LockingFreehand (harder)Jig-guided (easier)

Positioning and Preparation

Patient Position: Supine, knee flexed 30-40° over radiolucent triangle/bolster

Surgical Approach: Infrapatellar approach (medial parapatellar or transpatellar tendon)

Incision: 3-4cm vertical infrapatellar incision, medial parapatellar or midline transpatellar

Operative Technique

Step 1: Preoperative Planning and Setup

Preoperative Planning and Setup: Review AP/lateral XR and CT if available to assess fracture pattern, comminution, canal diameter. Measure contralateral femur for nail length (subtract 2-3cm). Plan nail diameter (ream 1-1.5mm larger). Setup radiolucent table with image intensifier opposite side. Confirm AP and lateral views obtainable BEFORE prep/drape.

Exam Pearl

Technical Tip: EXAM KEY: Templating on contralateral side gives accurate nail length. Entry point location is MOST CRITICAL technical point - wrong entry causes malreduction, implant failure, knee pain. CT useful for distal extension fractures.

Dangers at this step

  • Inadequate imaging may miss intra-articular extension
  • Wrong length estimation leads to suboptimal fixation

Step 2: Patient Positioning

Patient Positioning: Supine position. Knee flexed 30-40° over radiolucent bolster/triangle under distal thigh. This allows nail insertion trajectory and opens posterior cortex distally. Hip neutral position. Image intensifier on opposite side of fracture. CONFIRM: AP and lateral femur views including hip and knee achievable.

Exam Pearl

Technical Tip: EXAM KEY: 30-40° flexion is optimal - less than 30° makes entry difficult, more than 45° risks posterior cortex breach. Bolster position affects reduction - place at fracture level to assist reduction maneuvers.

Dangers at this step

  • Excess flexion greater than 45° risks posterior cortex perforation during nail insertion
  • Common peroneal nerve at risk with poor padding

Step 3: Surgical Approach to Knee

Surgical Approach to Knee: Midline or medial parapatellar 3-4cm longitudinal incision over inferior pole patella. CHOICE: (1) Transpatellar tendon (longitudinal split in midline) OR (2) Medial parapatellar (retract tendon laterally). Deepen to expose fat pad. Excise triangular portion of fat pad to visualize intercondylar notch entrance.

Exam Pearl

Technical Tip: EXAM KEY: Medial parapatellar PRESERVES tendon integrity (preferred by many) but gives slightly off-centre entry. Transpatellar gives central entry but requires meticulous tendon repair. If split tendon, tag with stay sutures for later repair.

Dangers at this step

  • Infrapatellar branch of saphenous nerve crosses incision medially
  • Patellar tendon injury if aggressive retraction

Step 4: Identify Anatomic Entry Point

Identify Anatomic Entry Point: Direct visualization of intercondylar notch. ENTRY POINT: anteroposterior - centre of notch (equal distance from lateral/medial walls), 1cm ANTERIOR to PCL insertion. Lateral view: ANTERIOR to Blumensaat's line (roof of notch). Use awl to mark/create starting point in subchondral bone.

Exam Pearl

Technical Tip: EXAM KEY: Entry TOO POSTERIOR damages PCL, nail driven anterior (apex anterior angulation). Entry TOO ANTERIOR creates difficulty insertion, notch impingement, patellofemoral symptoms. Blumensaat's line is KEY lateral landmark.

Dangers at this step

  • PCL injury from posterior entry point
  • ACL injury from eccentric lateral entry

Step 5: Guidewire Insertion

Guidewire Insertion: Insert ball-tipped guidewire through entry point under LIVE fluoroscopy (AP and lateral simultaneously if possible). Direct wire down femoral canal with gentle manipulation. GOAL: central in canal on AP and lateral views, passing fracture site without eccentric positioning. If fracture displaced, may need manipulation or small incision for reduction aids.

Exam Pearl

Technical Tip: EXAM KEY: Ball-tip prevents guidewire getting lost in soft tissues. Watch tip CONTINUOUSLY on fluoro - if eccentric, withdraw and redirect. Difficulty passing fracture = need closed reduction maneuvers or limited open reduction.

Dangers at this step

  • Guidewire exit through fracture into soft tissues
  • Wire advancement out through cortex proximally

Step 6: Fracture Reduction (if needed)

Fracture Reduction (if needed): Assess reduction on AP/lateral. ACCEPTABLE: less than 5° angulation, less than 1cm shortening, rotation matched to contralateral. If unacceptable: (1) Closed manipulation with traction/rotation, (2) Percutaneous clamps, (3) Mini-open at fracture site. Provisional reduction with K-wires or clamps. THEN pass guidewire.

Exam Pearl

Technical Tip: EXAM KEY: Reduction BEFORE reaming is critical - reaming displaced fracture risks eccentric canal, cortical perforation, malreduction. Rotation assessed by comparing lesser trochanter profile to contralateral femur on AP view.

Dangers at this step

  • Malreduction accepted and locked in with nail
  • Rotational malreduction hardest to assess

Step 7: Opening the Medullary Canal

Opening the Medullary Canal: Over guidewire, use cannulated awl or entry reamer to open distal femur entry portal. Start small, enlarge gradually. FEEL: penetration through subchondral bone into medullary canal. Confirm position with fluoro - should be INTRAMEDULLARY, not in soft tissue or articular.

Exam Pearl

Technical Tip: EXAM KEY: Gentle controlled force - excessive force risks fracture displacement, condyle fracture, or guidewire advancement. Opening adequately prevents difficulty with reamer passage.

Dangers at this step

  • Iatrogenic condyle fracture with excessive force
  • Entry through articular surface

Step 8: Sequential Reaming

Sequential Reaming: Ream over BALL-TIPPED guidewire in 0.5-1mm increments starting 1-1.5mm smaller than anticipated nail size. Ream to measured diameter (templated) plus 1-1.5mm. Feel for chatter (cortical contact), watch fluoro for eccentric reaming. GOAL: uniform reaming without eccentricity or fracture displacement.

Exam Pearl

Technical Tip: EXAM KEY: Ball-tipped wire essential - prevents wire advancement or exit through fracture. Reamings have osteogenic potential. Ream 1-1.5mm LARGER than nail for ease of passage. Stop if excessive resistance (risk perforation).

Dangers at this step

  • Posterior cortex perforation (popliteal artery injury)
  • Eccentric reaming causing malreduction

Step 9: Nail Insertion

Nail Insertion: Attach selected nail (length from template, diameter 1-1.5mm smaller than final reaming) to jig. Insert over guidewire with gentle rotatory movements. Monitor passage on fluoro - should remain central, pass fracture smoothly. If resistance: stop, assess with fluoro, may need additional reaming or wire repositioning. Advance until nail tip 5-10mm ABOVE lesser trochanter.

Exam Pearl

Technical Tip: EXAM KEY: Nail length critical - TOO SHORT: inadequate proximal fixation, TOO LONG: greater trochanter pain, difficulty with proximal locking. Tip position 5-10mm ABOVE lesser trochanter optimal. Rotatory insertion prevents incarceration.

Dangers at this step

  • Nail too long causes trochanteric pain
  • Nail too short gives inadequate proximal purchase

Step 10: Confirm Reduction and Nail Position

Confirm Reduction and Nail Position: Full AP and lateral fluoroscopy: (1) Fracture reduction acceptable, (2) Nail central in medullary canal throughout, (3) No cortical perforation, (4) Distal nail position in notch acceptable, (5) Proximal nail tip position appropriate. Address any issues NOW before locking.

Exam Pearl

Technical Tip: EXAM KEY: Final reduction check BEFORE locking - once locked, difficult to adjust. Varus/valgus malreduction common - check mechanical axis on AP. Flexion/extension malreduction - check lateral. Rotation hardest to assess - compare to contralateral.

Dangers at this step

  • Locking malreduced fracture
  • Missing rotational deformity

Step 11: Distal Locking (Static)

Distal Locking (Static): Using jig-guidance (attached to nail), insert 2-3 distal interlocking screws. TECHNIQUE: stab incision, tissue protector, drill through near cortex-nail-far cortex, measure, insert screw 5mm longer than measurement. Bicortical purchase essential. Most distal screw as close to joint as possible (maximum fragment control).

Exam Pearl

Technical Tip: EXAM KEY: DISTAL LOCKING FIRST for retrograde nails (opposite of antegrade). Jig-guided distal locking very accurate. Ensure screws don't penetrate joint - confirm with fluoro. Minimum TWO screws, THREE if short distal fragment. Locking provides rotational/length control.

Dangers at this step

  • Intra-articular screw penetration
  • Missing nail hole (bent jig)

Step 12: Proximal Locking (Static or Dynamic)

Proximal Locking (Static or Dynamic): FREEHAND technique (jig doesn't reach proximal femur): (1) Perfect circles technique - rotate C-arm until screw hole appears as PERFECT CIRCLE, (2) Stab incision centered on circle, (3) Drill centered in circle on both orthogonal views, (4) Measure and insert screw. Insert 1-2 proximal screws. STATIC (no sliding) for comminuted/unstable fractures, DYNAMIC (allow sliding) for simple transverse fractures.

Exam Pearl

Technical Tip: EXAM KEY: Freehand locking technically demanding - requires perfect circle technique mastery. Radiation exposure higher (protect thyroid, eyes). STATIC vs DYNAMIC: simple fractures can be dynamic (allows compression), comminuted MUST be static (prevent shortening).

Dangers at this step

  • Missed nail hole (eccentric drilling)
  • Excessive radiation exposure to surgeon

Step 13: Final Imaging and Assessment

Final Imaging and Assessment: Complete AP/lateral fluoroscopy: (1) ALL screws fully inserted, bicortical, correct length, (2) Reduction maintained (alignment, length, rotation), (3) No intra-articular screw penetration (distal screws, change knee flexion/rotation during check), (4) No hardware complications visible. Document images.

Exam Pearl

Technical Tip: EXAM KEY: INTRA-ARTICULAR SCREW penetration most common error - MUST check with knee in flexion/extension and rotation (changes condyle profile). Screw length: aim 5mm past far cortex. If unicortical purchase only = inadequate.

Dangers at this step

  • Missing intra-articular hardware
  • Accepting suboptimal reduction

Step 14: Wound Closure

Wound Closure: If tendon split: repair with #2 non-absorbable suture (Krackow or similar locking technique), ensure solid repair to prevent rupture. Irrigate thoroughly. Close retinaculum, subcutaneous with absorbable suture, skin. Bulky compressive dressing. NO DRAIN typically needed.

Exam Pearl

Technical Tip: EXAM KEY: Patellar tendon repair CRITICAL if split approach used - rupture is devastating complication. Krackow suture technique gives strongest repair. Early protected ROM improves outcomes if fixation stable.

Dangers at this step

  • Inadequate patellar tendon repair
  • Missed injury requiring documentation

Step 15: Postoperative Protocol

Postoperative Protocol: Weight-bearing status depends on fracture pattern and fixation stability. STABLE simple fracture with good fixation: early protected weight-bearing (TDWB advancing to PWB then FWB over 6-12 weeks as clinical/radiographic healing progresses). UNSTABLE comminuted fracture: NWB 6-8 weeks minimum. Early ROM exercises (prevent stiffness). DVT prophylaxis per protocol. Serial XR at 2, 6, 12 weeks.

Exam Pearl

Technical Tip: EXAM KEY: Retrograde nails allow EARLIER mobilization than plates (load-sharing vs load-bearing). Knee stiffness is common complication - early ROM critical. Full weight-bearing when radiographic/clinical healing (typically 8-12 weeks simple, 12-16 weeks comminuted).

Dangers at this step

  • Early weight-bearing on unstable fixation
  • Knee stiffness from immobilization

Complications

Retrograde Femoral Nailing Complications

Post-operative Care

Weight-bearing: STABLE simple fractures - touch-down weight-bearing advancing to partial then full over 6-12 weeks as clinical/radiographic healing progresses. UNSTABLE comminuted fractures - non-weight bearing 6-8 weeks minimum. ROM: immediate knee ROM exercises to prevent stiffness - flexion/extension in brace if needed initially. DVT prophylaxis per protocol (LMWH or DOACs). Follow-up: 2, 6, 12 weeks with AP/lateral XR to assess union, alignment, hardware position. Union expected 8-12 weeks simple fractures, 12-16 weeks comminuted. Full activity when clinical/radiographic union confirmed, typically 3-6 months.

Exam Viva Scenarios

Practice these scenarios to excel in your viva examination

VIVA SCENARIOStandard

EXAMINER

"A 45-year-old polytrauma patient has bilateral femoral shaft fractures with associated chest and abdominal injuries. How would you manage the femoral fractures and what approach would you use?"

EXCEPTIONAL ANSWER
This is an ideal scenario for retrograde femoral nailing of both femurs. The supine position offers several advantages in polytrauma: allows simultaneous access to chest and abdomen for monitoring/intervention, eliminates need for repositioning between sides, and permits efficient bilateral femoral fixation through the same positioning. I would coordinate with the trauma team regarding timing - early total care (less than 24 hours) if patient hemodynamically stable, or damage control orthopaedics with external fixation if borderline/unstable, converting to definitive nailing once resuscitated. Key technical points: single infrapatellar incision can be extended for both femur and tibia if floating knee present, ball-tipped guidewires essential to prevent wire loss, and static locking for all fractures in this high-energy scenario.
VIVA SCENARIOStandard

EXAMINER

"During retrograde nailing of a distal femoral shaft fracture, you're having difficulty achieving reduction and the guidewire keeps exiting posteriorly at the fracture site. What is your approach?"

EXCEPTIONAL ANSWER
Guidewire exiting posteriorly indicates the fracture is flexed at the apex (common pattern as gastrocnemius pulls distal fragment into flexion). My systematic approach: First, ensure adequate knee flexion (40-45°) which helps relax gastrocnemius and opens the posterior cortex. Second, place the bolster at the level of the fracture rather than distally to create an extension moment at the fracture site. Third, use percutaneous pointed reduction clamps through small stab incisions to control the distal fragment - one anteromedial, one anterolateral. Fourth, if still unable to pass wire, consider limited open reduction through a small lateral approach at the fracture site to directly visualize and reduce the fragments, pass wire under direct vision, then close and proceed with reaming and nailing. Document reduction maneuvers and any open assistance in the operative note.
VIVA SCENARIOStandard

EXAMINER

"You've completed retrograde femoral nailing and the patient develops anterior knee pain 3 months postoperatively that limits their rehabilitation. The fracture is healing well. What is your assessment and management?"

EXCEPTIONAL ANSWER
Anterior knee pain is the most common complication of retrograde nailing, affecting 20-40% of patients. My assessment: First, detailed history - location of pain (patellofemoral vs infrapatellar), aggravating factors (kneeling, stairs, prolonged sitting), and impact on function. Physical examination for patellofemoral crepitus, tenderness at nail entry site, patellar tracking abnormalities. Radiographs to assess nail position - is tip proud in the notch causing impingement? Is there evidence of patellofemoral arthritis? MRI if considering intervention to assess patellar tendon, articular cartilage, and hardware relationship. Initial management is conservative: activity modification avoiding aggravating positions, structured physiotherapy focusing on quadriceps and VMO strengthening, NSAIDs, and time. If pain persists after fracture union (typically 6-12 months), nail removal is indicated and improves symptoms in 60-80% of patients. Counsel patient that some residual symptoms may persist.

Retrograde Femoral Nailing - Exam Summary

High-Yield Exam Summary

References

  1. Ricci WM, Bellabarba C, Evanoff B, et al. Retrograde versus antegrade nailing of femoral shaft fractures. J Orthop Trauma. 2001;15(3):161-169.

  2. Tornetta P 3rd, Tiburzi D. Antegrade or retrograde reamed femoral nailing: a prospective, randomised trial. J Bone Joint Surg Br. 2000;82(5):652-654.

  3. Herrera-Soto JA, Price CT. Retrograde intramedullary nailing of the femur. J Am Acad Orthop Surg. 2009;17(11):687-696.

  4. Papadokostakis G, Papakostidis C, Dimitriou R, Giannoudis PV. The role and efficacy of retrograding nailing for the treatment of diaphyseal and distal femoral fractures: a systematic review of the literature. Injury. 2005;36(7):813-822.

  5. Ostrum RF, Agarwal A, Lakatos R, Poka A. Prospective comparison of retrograde and antegrade femoral intramedullary nailing. J Orthop Trauma. 2000;14(7):496-501.

  6. Moed BR, Watson JT. Retrograde nailing of the femoral shaft. J Am Acad Orthop Surg. 1999;7(4):209-216.

  7. Bong MR, Kummer FJ, Koval KJ, Egol KA. Intramedullary nailing of the lower extremity: biomechanics and biology. J Am Acad Orthop Surg. 2007;15(2):97-106.

  8. Canadian Orthopaedic Trauma Society. Reamed versus unreamed intramedullary nailing of the femur: comparison of the rate of ARDS in multiple injured patients. J Orthop Trauma. 2006;20(6):384-387.

  9. Lepore S, Capuano N, Romano G. Retrograde nailing of femoral shaft fractures in patients with hip arthroplasty. Arch Orthop Trauma Surg. 1999;119(5-6):286-289.

  10. Handolin L, Pajarinen J, Lindahl J, Hirvensalo E. Retrograde intramedullary nailing in distal femoral fractures--results in a series of 46 consecutive operations. Injury. 2004;35(5):517-522.