modified franch ostetomy vs franch osteotomy
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modified French osteotomy vs French osteotomy hallux valgus differences
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French Osteotomy vs. Modified French Osteotomy
Both procedures are supracondylar osteotomies used to correct cubitus varus (gunstock deformity) - most commonly a malunion following a pediatric supracondylar humerus fracture. The original French osteotomy was described by Lagrange & Rigault; the Modified French (Bellemore modification) addresses some of its limitations.
Side-by-Side Comparison
| Feature | French Osteotomy | Modified French Osteotomy |
|---|---|---|
| Surgical approach | Posterior longitudinal | Posterolateral |
| Triceps handling | Lateral half detached from insertion | Whole triceps detached |
| Ulnar nerve | Explored (routinely) | NOT explored |
| Medial cortex | Broken (greenstick completion) | Left intact - acts as hinge (more stable) |
| Primary plane of correction | Coronal plane (varus correction) | Coronal plane + limited rotational correction |
| Stability | Less stable (cortex broken) | More stable (intact medial cortex hinge) |
| Pin tract infection risk | Present | Present (~10%) |
| Nerve injury risk | Lower (nerve explored) | ~10% (nerve not routinely explored) |
- Campbell's Operative Orthopaedics 15th Ed, Chapter 38; SlideShare - Osteotomy around elbow
Key Technical Points
French Osteotomy
- Posterior approach to the distal humerus
- Lateral half of the triceps is detached from its insertion
- A lateral closing wedge cut is made; the medial cortex is deliberately broken (greenstick)
- Medial periosteum is left intact to act as a soft-tissue hinge
- Distal fragment is rotated externally to correct internal rotation deformity
- Fixed with two parallel screws + figure-of-eight wire (the original technique)
- Ulnar nerve is routinely explored due to medial approach
- Limitation: correction axis lies proximal to the center of rotation of the varus deformity, causing lateral translation and lateral condyle prominence post-operatively
Modified French Osteotomy (Bellemore)
- Uses a posterolateral approach instead of pure posterior
- The entire triceps is detached (not just the lateral half)
- Medial cortex is kept intact, making the construct more mechanically stable - this is the most important modification
- Ulnar nerve is not routinely explored, which simplifies the procedure but introduces nerve injury risk (~10%)
- Allows slightly better rotational correction than the original French technique
Clinical Outcomes
From a 2025 comparative study (Dey et al., J Ortho Sports Med 2025) comparing Modified French osteotomy to 3D osteotomy:
- Modified French: 40% excellent, 50% good, 10% fair outcomes (Mayo Elbow Performance Score)
- Carrying angle correction: improved to ~9.4° post-op
- Complications: 10% pin tract infection, 10% nerve injury, 5% superficial wound infection
- Bony union was slower compared to 3D osteotomy
The North et al. (J Pediatr Orthop 2016) 27-year long-term study concluded French osteotomy results are comparable to technically more demanding procedures (dome, step-cut, multiplanar osteotomies) with a lower complication rate.
Limitations of Both Techniques vs. 3D Osteotomy
Both the French and Modified French osteotomies are primarily coronal plane corrections. Cubitus varus is in reality a triplanar deformity (varus + internal rotation + hyperextension). Neither corrects the rotational component as well as three-dimensional (Uchida) osteotomy, which directly addresses all three planes simultaneously and achieves:
-
Better internal rotation correction (p=0.001)
-
Better carrying angle restoration (p=0.035)
-
Earlier bony union (p=0.024)
-
Superior MEPS scores (p=0.015)
-
Campbell's Operative Orthopaedics 15th Ed, p. 8129-8145
Summary
The Modified French osteotomy (Bellemore) improves upon the original by keeping the medial cortex intact (better stability), switching to a posterolateral approach, and detaching the full triceps. The trade-off is that the ulnar nerve is not explored, introducing some nerve injury risk. Both techniques are acceptable for single-plane (coronal) cubitus varus correction, but neither fully addresses the triplanar nature of the deformity as effectively as modern 3D osteotomy techniques.
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