Kienbock Disease: Lichtman Stages Explained on MRI

Stage I: Normal X-ray, MRI Detects Edema

In Stage I, plain radiographs are entirely normal — no sclerosis, no height loss, no cortical irregularity. The lunate appears radiographically indistinguishable from a healthy bone. MRI reveals the diagnosis: diffuse hypointensity throughout the lunate on T1-weighted sequences, reflecting replacement of normal fatty marrow by ischemic or edematous tissue. T2-weighted signal is variable and depends on the relative contribution of acute edema versus early fibrous replacement. When acute edema dominates, T2 signal is elevated; as ischemia progresses toward sclerosis, T2 signal normalizes or decreases.

Stage I is the therapeutically critical window. The lunate retains its structural integrity, so interventions aimed at restoring vascular supply or reducing mechanical load have the greatest chance of halting progression. Gadolinium-enhanced MRI can demonstrate enhancement in viable portions of the lunate, guiding revascularization planning. For guidance on interpreting wrist MRI sequences, see our article on how to read a wrist MRI.

Stage II: Sclerosis Without Collapse

Stage II Kienbock's disease is defined by the appearance of lunate sclerosis on plain radiograph — a diffuse or patchy increase in bone density reflecting dead bone and reactive mineralization — without any loss of lunate height or carpal architectural change. The lunate contour remains intact. On MRI, T1 signal remains diffusely low. T2 signal in Stage II is typically low as well because edema has given way to sclerotic dead bone with little free water; this distinguishes Stage II from Stage I at the MRI level even when radiographs show only early sclerosis.

Stage II still offers an intervention window before collapse. Joint leveling procedures — radial shortening osteotomy or ulnar lengthening osteotomy — are most commonly offered in Stage I and II when ulnar minus variance is present, because unloading the radiolunate joint can slow or arrest progression. Revascularization with a vascularized bone graft may also be considered in Stage II.

Stage IIIA: Fragmentation Without Carpal Collapse

Stage IIIA marks the beginning of structural failure. The lunate shows collapse, fragmentation, or a coronal fracture line on radiograph or CT. However, overall carpal alignment is preserved: the scaphoid retains normal orientation, the capitate has not migrated proximally, and the carpal height ratio remains within normal limits. The Stahl-modified classification identifies a subgroup — Stage IIIC — for lunates with a frank coronal split fracture, which carries a distinct surgical implication of potential vascularized distal radius bone graft insertion into the fracture plane.

With carpal alignment still intact, motion-preserving procedures remain viable in Stage IIIA. Capitate shortening osteotomy, which unloads the lunate from the distal row, and vascularized bone grafts from the dorsal distal radius are preferred options. Because the carpus has not yet collapsed, these procedures aim to preserve functional wrist motion alongside arresting disease progression.

Stage IIIB: Fragmentation With Carpal Collapse

Stage IIIB represents a qualitative shift in disease severity. Lunate fragmentation is accompanied by fixed carpal collapse: the scaphoid assumes a flexed, rotated posture (the scaphoid ring sign on PA radiograph), and the capitate migrates proximally through the space vacated by the collapsed lunate. This carpal malalignment pattern resembles DISI (dorsal intercalated segment instability) and is not reducible by traction. Carpal height ratio is reduced. The radiocarpal joint may still be spared at this stage.

The irreversibility of carpal collapse in Stage IIIB shifts treatment toward salvage procedures that accept limited motion in exchange for pain relief and stability. Proximal row carpectomy removes the scaphoid, lunate, and triquetrum entirely, creating a new articulation between the capitate and the lunate fossa of the radius — suitable when the capitate head cartilage and lunate fossa are preserved. Scaphotrapeziotrapezoid (STT) fusion or four-corner fusion (capitate-hamate-triquetrum-lunate) corrects carpal alignment while eliminating motion at the midcarpal joint. See our overview of Kienbock's disease for the full clinical picture.

Stage IV: Pancarpal Arthritis

Stage IV is the end-stage of Kienbock's disease. The collapsed, fragmented lunate has driven generalized articular cartilage loss across both the radiocarpal and midcarpal joints. Radiographs show diffuse joint space narrowing, osteophyte formation, and subchondral cyst formation throughout the wrist. MRI demonstrates low T1 and T2 signal throughout the carpus with articular cartilage loss evident on fat-suppressed sequences. The clinical presentation is chronic, fixed wrist pain with severely limited range of motion and grip strength.

At Stage IV, the only reliable pain-relieving options are total wrist arthrodesis (fusion of the radiocarpal and midcarpal joints, sacrificing all wrist motion but providing a stable, pain-free extremity for grip-dependent tasks) or total wrist arthroplasty (a prosthetic joint replacement that preserves some functional motion but carries a higher reoperation rate). Patient factors — age, activity demands, and hand dominance — drive the final decision between these two options.

Treatment by Stage

Stage I treatment focuses on offloading the lunate and maximizing revascularization potential. Immobilization with a short-arm cast for 3-6 months is first-line in lower-demand patients or when surgery is contraindicated. In patients with ulnar minus variance, radial shortening osteotomy is the most studied joint leveling procedure, reducing radiolunate contact stress and stabilizing the TFCC. Vascularized bone grafts from the pronator quadratus or the dorsal distal radius (4th and 5th extensor compartment artery graft) deliver a new vascular pedicle into the ischemic lunate.

Stage II mirrors Stage I in terms of joint leveling eligibility. The key distinction from Stage IIIA is the absence of lunate structural failure, which means the joint leveling effect can still benefit an architecturally intact lunate. Stage IIIA adds capitate shortening osteotomy as a surgical option — reducing the length of the capitate unloads the lunate from below without requiring a formal joint leveling of the forearm bones. Vascularized bone grafts remain viable in well-selected Stage IIIA patients before carpal collapse becomes fixed.

Stage IIIB management pivots to salvage: proximal row carpectomy preserves grip-range wrist motion when capitate cartilage is intact; four-corner fusion sacrifices midcarpal motion but provides better stability when the capitate head shows articular damage. Stage IV leaves total wrist arthrodesis or arthroplasty as the two remaining options, chosen based on patient age, demand, and tolerance of zero versus limited residual motion.

Key Takeaways

• MRI is the only modality that detects Stage I Kienbock's disease — diffuse T1 hypointensity with normal radiographs defines this critical early window
• Lichtman staging runs I → II (sclerosis) → IIIA (collapse, aligned carpus) → IIIB (collapse, carpal malalignment) → IV (pancarpal arthritis); Stahl adds IIIC for coronal split fractures
• Ulnar minus variance concentrates load on the radiolunate joint and is present in ~75% of Kienbock's patients; joint leveling (radial shortening or ulnar lengthening) is the primary Stage I-II intervention when variance is present
• Stage IIIB carpal collapse — scaphoid flexion and proximal capitate migration — is fixed and irreversible, shifting treatment to salvage procedures such as proximal row carpectomy or four-corner fusion
• Stage IV pancarpal arthritis is managed by total wrist arthrodesis or arthroplasty; patient age and functional demands determine which option is appropriate
• Gadolinium-enhanced MRI can demonstrate residual lunate vascularity, guiding revascularization candidacy in Stages I and II

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