Criteria for reduction in distal end radius fractures
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criteria for acceptable reduction distal radius fracture radial length inclination volar tilt
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Criteria for Reduction in Distal End Radius Fractures
Normal Radiographic Anatomy (Baseline)
Understanding normal values is essential before defining acceptable limits. Using the classic mnemonic 11:22:11:
| Parameter | Normal Value |
|---|---|
| Radial height | 11-12 mm |
| Radial inclination | 22-23° |
| Volar tilt | 11-12° |
| Ulnar variance | ±2 mm |
Criteria for Acceptable Reduction
From Campbell's Operative Orthopaedics (15th Ed, 2026) - Table 62.13
| Criterion | Normal | Acceptable |
|---|---|---|
| Ulnar variance (radial length) | ±2 mm (lunate facet to ulnar head) | No more than 2 mm shortening relative to ulnar head |
| Radial height | 12 mm | Less than 3 mm shortening |
| Palmar (lateral) tilt | 11° of volar tilt | Less than 10° dorsal tilt |
| Radial inclination | 20° (lunate facet to radial styloid) | No less than 10° |
| Intraarticular step or gap | None | Less than 2 mm of either |
Note from Campbell's: If closed treatment is chosen for a fracture with radiographic features that increase instability rates, weekly radiographs for the first 3 weeks are recommended so that early surgical intervention can occur if the fracture unacceptably displaces.
Radiographic Criteria for Acceptable Healing (Graham / Campbell's 2026)
This second set of criteria - from Graham TJ (1997) as cited in Campbell's - is used in the context of malunion assessment:
| Criterion | Acceptable Measurement |
|---|---|
| Radioulnar length | Radial shortening < 5 mm at DRUJ compared to contralateral wrist |
| Radial inclination | ≥ 15° on PA film |
| Radial tilt (sagittal) | Between 15° dorsal tilt and 20° volar tilt |
| Articular incongruity | ≤ 2 mm at radiocarpal joint |
From Miller's Review of Orthopaedics (9th Ed) - Exam Summary
Acceptable reduction (3 key parameters):
- Radial shortening < 3 mm
- Dorsal tilt < 10°
- Intraarticular step-off < 2 mm
From Orthobullets / AAOS Clinical Practice Guideline
| Measurement | Normal | Acceptable Criteria |
|---|---|---|
| Radial height (AP) | 13 mm | < 5 mm shortening |
| Radial inclination (AP) | 23° | Change < 5° |
| Articular step-off (AP) | Congruous | < 2 mm step-off |
| Volar tilt (lateral) | 11° | Dorsal angulation < 5° (or within 20° of contralateral) |
AAOS CPG threshold for surgery (non-geriatric patients, moderate evidence): Operative fixation is indicated when post-reduction values show:
- Radial shortening > 3 mm
- Dorsal tilt > 10°
- Intraarticular step-off > 2 mm
Lafontaine Criteria for Predicting Instability (Redisplacement Risk)
Three or more of the following features at presentation predicts high risk of secondary displacement despite initial reduction:
- Dorsal angulation > 20°
- Dorsal comminution
- Intra-articular radiocarpal fracture
- Associated ulnar fracture
- Age > 60 years
Validation note (Rockwood & Green's, 10th Ed): Nesbitt et al. found that age alone was the only statistically significant predictor of secondary displacement. MacKenney et al. (n~4,000) identified the most consistent predictors as patient age, ulnar variance, and metaphyseal comminution.
Consequences of Malreduction
From Campbell's:
- Intraarticular incongruity > 2 mm - poor functional outcome
- Dorsal angulation > 20° + radial inclination < 10° - likely symptomatic
-
10° dorsal tilt - decreased wrist flexion
-
6 mm radius shortening - DRUJ dysfunction
- Fractures with > 25-30° angulation (frontal or sagittal) or ≥ 6 mm shortening - more likely to become symptomatic
Quick Mnemonics for Exams
- Normal: 11:22:11 (radial height 11 mm, inclination 22°, volar tilt 11°)
- Acceptable reduction: 3-10-2 (shortening < 3 mm, dorsal tilt < 10°, articular step-off < 2 mm)
- Lafontaine instability: ≥3 of 5 criteria = high risk, consider surgery
Sources: - Campbell's Operative Orthopaedics 15th Ed 2026 (Table 62.13, p. 2049) | - Rockwood & Green's Fractures in Adults 10th Ed 2025, p. 1831 | - Miller's Review of Orthopaedics 9th Ed, p. 2827 | AAOS Distal Radius Fracture CPG | Orthobullets - Distal Radius Fractures
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