Modern Study Review (AI-Generated)
High-Yield Summary
Kienböck’s disease is avascular necrosis of the lunate leading to progressive wrist pain, stiffness, and collapse. It is strongly associated with negative ulnar variance and vascular supply anomalies. Early diagnosis and staging are critical to guide treatment, which ranges from joint-preserving osteotomies in early stages to salvage procedures in advanced collapse and arthritis. Modern management prioritizes pain relief and preservation of wrist function.
Key Diagnostic Findings
| Aspect | Details |
|---|---|
| Anatomy | Lunate bone in the proximal carpal row; vascular supply often from one or two vessels. |
| Clinical Presentation | Dorsal wrist pain, decreased range of motion, tenderness over lunate, possible swelling. |
| Imaging | – X-rays: PA, lateral, and neutral rotation views to assess ulnar variance and lunate changes. – Ulnar Variance: Negative variance (>3 mm) is pathologic. – MRI: Early detection of avascular necrosis and bone marrow edema. – CT: Fragmentation and collapse assessment. |
| Classification (Lichtman Staging) | 1. Pre-radiographic (MRI positive, X-ray normal) 2. Sclerosis of lunate 3A. Fragmentation without scaphoid rotation 3B. Fragmentation with scaphoid rotation (flexion) 4. Collapse with secondary arthritis |
Current Gold Standard Treatment
| Stage | Treatment Indications & Options |
|---|---|
| Early (Stages 1–3A) with negative ulnar variance | Radial shortening osteotomy to unload lunate; preferred approach is volar distal radius osteotomy with plate fixation. |
| Early (Stages 1–3A) with neutral ulnar variance | Intercarpal fusion (STT fusion) or osteotomy to alter joint biomechanics (radial opening wedge or ulnar closing wedge). Revascularization procedures are experimental. |
| Advanced (Stage 3B) with lunate collapse and scaphoid rotation | Salvage procedures: lunate excision + limited carpal fusion (STT or scapho-capitate), or proximal row carpectomy (PRC) if capitate and lunate fossa are intact. |
| End-stage (Stage 4) with arthritis | Options depend on patient demands: – Active patients: lunate excision + scapho-capitate fusion – Low-demand patients: total wrist arthrodesis for pain relief |
Modern Complications & Outcomes
- Complications: Nonunion or malunion after osteotomy, persistent pain, progression of arthritis, hardware irritation, limited wrist motion after fusion or arthrodesis.
- Outcomes: Early-stage radial shortening osteotomy shows good pain relief and function preservation. Salvage procedures improve pain but reduce wrist motion. PRC offers a motion-preserving option but requires intact cartilage surfaces.
- Board Exam Pearls:
- Negative ulnar variance is a key risk factor.
- Lichtman classification guides treatment.
- Radial shortening osteotomy is first-line for early disease with ulnar minus variance.
- PRC contraindicated if lunate fossa or proximal capitate is damaged.
- Salvage procedures trade motion for pain relief.
Classic Clinical Notes
Keinbock’s Disease
Associations/Possible Etiologies:
- Trauma: repetitive or single; severe trauma (perilunate dislocations) often do not cause Kienböck’s.
- Ulnar variance: negative ulnar variance (ulnar minus wrist).
- Vascular anomalies: single feeding vessel rather than two.
- Shape of lunate.
- Bilateral in 15% of cases.
X-rays:
- To assess ulnar variance, forearm must be in neutral rotation.
- Position: patient seated, shoulder abducted 90°, elbow flexed 90°, forearm neutral, x-ray aimed at wrist joint.
- Supination makes ulna appear shorter (more ulnar minus), pronation makes ulna appear longer (more ulnar plus).
- Pathologic ulnar minus is >3 mm.
Stages:
- Pre-radiographic
- Sclerosis
3A. Fragmentation and early collapse without scaphoid rotation
3B. Fragmentation and early collapse with scaphoid rotation
- Collapse and arthritis (assess collapse with carpal height ratio = carpal height / 3rd metacarpal height)
Treatment Scenarios:
- Early (Stages 1–3A) with ulnar minus: radial shortening osteotomy preferred; volar approach through FCR sheath; plate fixation with compression.
- Early (Stages 1–3A) with neutral ulna: intercarpal fusion (STT fusion), osteotomy to increase radial inclination (ulnar closing wedge or radial opening wedge), or experimental revascularization.
- Stage 3B (post-scaphoid rotation): lunate excision + limited carpal fusion (STT or scapho-capitate), or proximal row carpectomy if capitate proximal pole intact.
- Stage 4 (advanced arthritis):
- Active patients wanting motion: lunate excision + scapho-capitate fusion.
- Patients wanting pain relief with stiffness: wrist arthrodesis.
PRC Prerequisites:
- Intact lunate fossa.
- Intact proximal pole of capitate (some mild degeneration may be acceptable).
Last Updated on January 24, 2026 by orthonet
Leave a Reply
Want to join the discussion?Feel free to contribute!