Treatment of Near-Complete Full-Thickness Scapholunate Ligament Tear
For a near-complete full-thickness scapholunate ligament tear, surgical repair should be performed as early as possible—ideally within 3 weeks of injury—to optimize outcomes and prevent progression to chronic instability and degenerative arthritis.
Diagnostic Confirmation
Before proceeding with treatment, confirm the diagnosis with advanced imaging:
- CT arthrography is the gold standard with nearly 100% sensitivity, specificity, and accuracy for detecting scapholunate ligament tears 1
- MR arthrography provides comparable accuracy and better assessment of which specific ligament segments are torn, which has important biomechanical implications for surgical planning 2, 3
- Standard radiographs should assess for scapholunate diastasis >4 mm and dorsal lunate tilt >10°, which indicate dorsal intercalated segmental instability 1
Treatment Algorithm
Acute Injuries (< 3 weeks)
Primary surgical repair is the treatment of choice for near-complete full-thickness tears in the acute setting 4, 5. The evidence strongly supports early intervention:
- Repairs performed within 3 weeks show significantly better outcomes than delayed repairs 4
- Direct ligament repair combined with dorsal capsulodesis or ligamentoplasty provides optimal stability 6, 5
- Early surgery before scar contracture facilitates treatment and enhances outcomes 5
Surgical technique should include:
- Direct repair of both volar and dorsal limbs of the scapholunate ligament to account for multidirectional force vectors 6
- Dorsal intercarpal ligament augmentation for additional stability 5
- Assessment and repair of any accompanying extrinsic ligament injuries (particularly dorsal intercarpal and radiolunotriquetral ligaments) 7, 8
Subacute/Chronic Injuries (> 3 weeks to months)
If the tear is still reducible (carpal alignment can be restored):
- Delayed direct repair remains an option even after complete ligament tear, with functional outcomes possible at long-term follow-up 4
- Consider arthroscopic reduction and association of the scapholunate joint (ARASL) technique, which creates fibrous pseudarthrosis stabilized by cannulated screw placement 9
- Three-ligament tenodesis for nonrepairable complete ruptures with reducible carpal malalignment and no secondary osteoarthritis 10
If the tear is irreducible or there is established carpal malalignment:
- Reconstruction techniques using tendon grafts to recreate both volar and dorsal ligament limbs 6, 10
- Capsulodesis procedures as adjuncts to ligament reconstruction 11
Conservative Management (Limited Role)
Conservative treatment has extremely limited application for near-complete full-thickness tears:
- May be considered only for partial tears without dissociation where secondary stabilizers (extrinsic ligaments) remain intact 8
- For near-complete full-thickness tears, conservative management will likely result in progression to chronic instability and scapholunate advanced collapse arthritis 11
Critical Pitfalls to Avoid
Delaying surgery beyond 3 weeks: This significantly compromises outcomes due to scar contracture and tissue quality deterioration 4, 5
Failing to assess extrinsic ligament integrity: 44% of scapholunate ligament injuries have accompanying extrinsic ligament damage, particularly dorsal intercarpal and radiolunotriquetral ligaments 8. These must be addressed surgically for optimal stability 7
Repairing only the dorsal component: Both volar and dorsal limbs must be reconstructed to restore proper biomechanics 6
Attempting conservative management: Unlike partial tears, near-complete full-thickness tears will not heal with immobilization or therapy and will progress to instability 11, 8
Special Populations
Professional athletes or patients requiring rapid return to high-demand activities: Consider immediate surgical repair to minimize recovery time and prevent recurrent instability, similar to the approach for acute complete ligament ruptures in professional basketball players 5
Expected Outcomes
With appropriate early surgical intervention:
- Pain reduction from VAS 8-9 to 1.5-5 9, 7
- Functional improvement with DASH scores improving from 63 to 40 7
- Grip strength recovery to approximately 78% of contralateral side 9
- ROM preservation at approximately 80% of preoperative values 9
Important caveat: Radiographic arthritis may develop at long-term follow-up in some patients, but clinical functional outcomes may remain satisfactory despite radiographic changes 4. This should not deter appropriate surgical intervention in the acute setting.