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Hand & Upper Limb

Wrist Arthroscopy

Comprehensive surgical technique guide for wrist arthroscopy — portals, TFCC repair, SL ligament assessment, ganglion decompression, and carpal instability evaluation for FRCS/FRACS exam preparation

Core Procedure
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By OrthoVellum Medical Education Team

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High-yield overview

Portal Anatomy | Palmer TFCC Classification | Geissler SL Grading | TFCC Repair vs Debridement | Ganglion Decompression | advanced

Surgical Imaging

Dorsal wrist arthroscopy portals
Set-up for wrist arthroscopy: the hand suspended in finger-trap traction from a tower, with the standard dorsal portal sites marked on the wrist between the extensor tendons.Credit: AI-generated medical image · OrthoVellum
TFCC anatomy and Palmer classification
Arthroscopic view inside the radiocarpal joint of a triangular fibrocartilage complex (TFCC) tear — a probe lifts the frayed central perforation (a Palmer Class 1A lesion).Credit: AI-generated medical image · OrthoVellum
Wrist in traction for arthroscopy with scope insertion
Wrist suspended in longitudinal traction; radiocarpal joint insufflated and the arthroscope introduced through a dorsal portal.Credit: Khanchandani P et al., Indian J Orthop · via Open-i (NIH), CC BY
Arthroscopic-assisted fixation of an intra-articular distal radius fracture
Pre- and post-operative radiographs of an intra-articular distal radius fracture managed with arthroscopic-assisted reduction and fixation.Credit: Khanchandani P et al., Indian J Orthop · via Open-i (NIH), CC BY

Wrist Arthroscopy — 6 Critical Exam Points

Palmer TFCC Classification — Must Know

Class 1 (Traumatic): 1A = central perforation (debridement only — avascular); 1B = ulnar avulsion from fovea (REPAIRABLE — repair to fovea); 1C = distal avulsion from carpal bones; 1D = radial avulsion from sigmoid notch. Class 2 (Degenerative): 2A–2E progressive ulnar impaction changes. The exam distinction is always: Class 1B = repair possible, Class 1A = debridement only.

Geissler SL Ligament Grading

Arthroscopic grading of SL instability viewed from midcarpal portal: Grade I = attenuation, no gap. Grade II = step-off, probe passes into gap. Grade III = 1mm probe passes freely into SL interval. Grade IV = 2.7mm arthroscope passes into SL interval (grossly unstable). Grades I–II conservative; Grade III–IV require intervention (K-wires, SL repair, or reconstruction).

3-4 Portal Anatomy — Standard Viewing

Located between the 3rd extensor compartment (EPL) and 4th extensor compartment (EDC). Positioned just ulnar to Lister's tubercle. This is the primary viewing portal for radiocarpal arthroscopy. Hazard: EPL runs directly beneath — must retract EPL before trocar insertion. Dorsal sensory branches of the radial nerve are immediately superficial.

Traction Setup — Standard Wrist Arthroscopy

Wrist arthroscopy requires joint distraction to open the narrow radiocarpal space. Standard setup: 5–10 lb (2–4 kg) longitudinal traction through finger traps on the index and middle fingers. Arm suspended vertically (tower) or horizontal (flat). Scope diameter: 1.9 mm or 2.4 mm for radiocarpal; 2.7 mm may be used in midcarpal joint. Traction duration should be limited to under 90 minutes to avoid nerve injury.

TFCC Foveal Repair vs Debridement

REPAIR (1B foveal avulsion): TFCC has peripheral vascular supply from ulnar artery branches — repair is biologically possible at the ulnar periphery. Arthroscopic techniques include outside-in repair (suture passed through 6U portal and tied over capsule) and inside-out repair with suture shuttle. DEBRIDEMENT (1A central): Central disc has no blood supply — repair cannot heal. Debridement to stable rim. Key exam message: location determines treatment.

Ganglion Recurrence — Arthroscopic vs Open

Arthroscopic dorsal ganglion excision allows decompression of the ganglion stalk from the scapholunate interval without open incision. The ganglion stalk is visualised through the 3-4 portal and the connection to the dorsal capsule is excised using a motorised shaver or radiofrequency probe. Recurrence rates: the best evidence is the Kang et al. Level I RCT (J Hand Surg Am 2008), which found arthroscopic and open recurrence comparable at 12 months (roughly 11% arthroscopic vs 9% open). Older series quoted higher arthroscopic recurrence; modern technique narrows the gap. Arthroscopic excision offers a smaller scar, less stiffness and faster recovery, but is technically demanding and is NOT proven to lower recurrence. Counsel patients that recurrence is possible with either approach.

Mnemonic

PALMERPALMER — TFCC Classification (Class 1 Traumatic)

Hook:PALMER runs through TFCC classification — the critical exam distinction is Class 1A (central = debridement only) vs Class 1B (peripheral foveal = repair). Location determines biological potential for healing.

Mnemonic

PORTALPORTAL — Wrist Arthroscopy Setup Sequence

Hook:PORTAL guides you through wrist arthroscopy setup from patient positioning to systematic ligament inspection — each letter is a critical setup decision point the examiner may ask about

Comprehensive Technique Guide

Indications for Wrist Arthroscopy

Wrist arthroscopy provides diagnostic and therapeutic access to the radiocarpal and midcarpal joints with minimal soft tissue morbidity. Osterman first established the technique for TFCC diagnosis and treatment in 1990.

Established Indications:

1. TFCC Injuries (Palmer Class 1 Traumatic)

  • Class 1B foveal avulsion: arthroscopic repair to fovea is first-line treatment
  • Class 1A central perforation: arthroscopic debridement to stable rim
  • Ulnar impaction syndrome (Class 2C–2E): arthroscopic debridement ± ulnar shortening osteotomy
  • Diagnosis of ulnar-sided wrist pain refractory to conservative management

2. Scapholunate Ligament Injuries

  • Geissler Grade III–IV: arthroscopic assessment guides treatment (K-wire stabilisation, open SL repair)
  • Gold standard for dynamic instability staging — superior to MRI for functional assessment
  • Assessment before planned SL reconstruction

3. Dorsal Ganglion Decompression

  • Recurrent ganglion after aspiration
  • Patient preference for smaller incision
  • Ganglion stalk visualised and decompressed from SL interval through 3-4 portal
  • Recurrence comparable to open excision in the Kang Level I RCT (about 11% arthroscopic vs 9% open at 12 months) — counsel patients that recurrence is possible with either technique

4. Loose Body Removal

  • Post-traumatic loose bodies in radiocarpal or midcarpal compartments
  • Synovial osteochondromatosis of the wrist

5. Distal Radius Fractures and Other Indications

  • Intra-articular distal radius fracture — arthroscopic-assisted reduction confirms articular step-off correction (target step/gap under 2 mm) and detects associated TFCC/SL/LT injury (present in up to two-thirds — Geissler)
  • Lunotriquetral ligament injuries
  • Radiocarpal/midcarpal synovectomy (e.g. inflammatory arthritis)
  • Arthroscopic management of dorsal wrist ganglion

Evidence Summary:

ReferenceFindingPMID
Palmer AK (J Hand Surg Am 1989)TFCC classification — landmark traumatic (Class 1) vs degenerative (Class 2) system used worldwide2666492
Geissler WB et al. (JBJS Am 1996)Arthroscopic SL/LT grading system — 68% of intra-articular distal radius fractures had carpal soft-tissue injury8613442
Osterman AL (Arthroscopy 1990)Arthroscopic TFCC debridement — 73% complete pain relief, 88% found procedure worthwhile (52 patients)2363779
Atzei A (J Hand Surg Eur 2009)Treatment-oriented sub-classification of Palmer 1B foveal tears (Atzei classes 1–5) guiding repair vs reconstruction19620186
Kang L et al. (J Hand Surg Am 2008)Level I RCT — arthroscopic vs open dorsal ganglion excision recurrence comparable at 12 months18406949

Diagnostic Accuracy of Wrist Arthroscopy

Wrist arthroscopy remains the gold standard for assessing intrinsic wrist ligament injuries and TFCC tears. In comparison to other imaging modalities:

ModalitySL Tear SensitivityTFCC Tear SensitivityLimitations
Plain X-rayPoor (only detects established SLAC)Not visibleOnly static bony alignment
MRI (non-arthrogram)57–78%60–75%Operator dependent; small ligaments near resolution limit
MR arthrogram79–88%84–92%Invasive (intra-articular injection); best non-arthroscopic test
CT arthrogram75–85%80–90%Radiation, invasive
Wrist arthroscopyNear 100% (gold standard)Near 100% (gold standard)Invasive, requires anaesthesia and theatre

For exam candidates: MR arthrogram is the best pre-operative investigation before wrist arthroscopy for suspected TFCC or SL injury. Wrist arthroscopy provides the definitive diagnosis AND allows concurrent treatment in the same setting.

Pre-operative Workup

All patients undergoing wrist arthroscopy for ligament or TFCC pathology should have:

  • Weight-bearing AP and lateral wrist X-ray (assess carpal alignment, SL gap, DISI)
  • Ulnar variance measurement (positive variance suggests ulnar impaction, relevant to TFCC degenerative disease)
  • MR arthrogram (best pre-operative imaging for soft tissue structures)
  • Clinical examination: fovea sign (ulnar-sided TFCC foveal avulsion), scaphoid shift test (SL instability), DRUJ stress test

Clinical Decision Scenarios

Use these scenarios to practise clinical reasoning and management decisions

CLINICAL SCENARIOAdvanced

CLINICAL PROMPT

"A 28-year-old recreational tennis player sustained a forced ulnar deviation injury to the right wrist 6 months ago. She has persistent ulnar-sided wrist pain, positive ulnar fovea sign, and pain with DRUJ stress testing. MRI arthrogram shows a TFCC peripheral avulsion at the fovea. She has failed 3 months of splinting. Describe your arthroscopic management."

PRACTICAL APPROACH
This is a Palmer Class 1B TFCC foveal avulsion — the only class where arthroscopic repair is biologically indicated, because the peripheral TFCC has a vascular supply from ulnar artery branches. I would perform wrist arthroscopy under general anaesthesia or regional block. After establishing 3-4 portal (viewing) and 4-5 portal (working), I would use the 6R portal for initial outflow. I would inspect the radiocarpal joint systematically and confirm the foveal avulsion using a probe at the 6U portal — the TFCC will be detached from the fovea and lax under probing. I would then perform an arthroscopic outside-in repair. I would insert a suture-passing curved needle through the 6U portal, pierce the peripheral TFCC tissue, and pass a permanent suture — 0-PDS or 2-0 Fiberwire — through the tissue. After passing two sutures, I would make a small 1 cm open incision at the 6U portal, identify and protect the dorsal sensory branch of the ulnar nerve, and tie the sutures over the ECU subsheath to re-attach the TFCC to the ulnar fovea. Post-operatively, I would apply a long-arm cast for 4–6 weeks to protect the repair from forearm rotation stress, then begin graduated ROM.
CLINICAL SCENARIOAdvanced

CLINICAL PROMPT

"You are performing wrist arthroscopy for suspected SL instability in a 32-year-old who fell on an outstretched hand 8 weeks ago. Radiocarpal inspection through 3-4 portal shows a widened SL interval. You then insert the arthroscope into the midcarpal radial portal and can pass the 2.7mm arthroscope itself through the SL interval from the distal side. What is the Geissler grade and what are your management options?"

PRACTICAL APPROACH
Passage of the 2.7mm arthroscope through the SL interval from the midcarpal portal confirms Geissler Grade IV instability — this is the most severe grade, indicating gross scapholunate instability with complete disruption of the SL ligament complex. Management options at Grade IV depend on the chronicity and the quality of the remaining ligament tissue. At 8 weeks post-injury, this is an acute-to-subacute injury and primary repair is still potentially feasible. I would assess the SL ligament remnants at arthroscopy. If there is identifiable ligament tissue at the scaphoid insertion, an open SL ligament repair (Brunelli or three-ligament tenodesis) gives the best functional result for Grade IV instability in a young active patient. If the tissue quality is poor or the ligament is irreparable, the best acute option is reduction and K-wire stabilisation of the SL joint (2–3 K-wires from scaphoid to lunate and scaphoid to capitate) under fluoroscopic guidance, with long-arm cast immobilisation for 8 weeks. I would not offer conservative management alone for Grade IV — the risk of progressive SLAC wrist deformity is high without surgical stabilisation.
CLINICAL SCENARIOAdvanced

CLINICAL PROMPT

"You are performing routine diagnostic wrist arthroscopy through the 3-4 portal with a motorised shaver. At the end of the procedure you release the tourniquet and deflate. Post-operatively the patient cannot extend the IP joint of their thumb. What has happened and how do you manage this?"

PRACTICAL APPROACH
This presentation is consistent with an EPL tendon injury — either direct transection or thermal injury from the motorised shaver or radiofrequency device during the arthroscopy. EPL at Lister's tubercle passes directly beneath the 3-4 portal and is the most at-risk tendon in wrist arthroscopy. This is the most feared complication of wrist arthroscopy. First I would document the injury in the operative records, immediately inform the patient and family of the complication in accordance with duty of candour requirements, and ensure complete documentation. I would arrange urgent re-exploration under anaesthesia within 24–48 hours — ideally the same day. If EPL is found to be completely transected with good tendon quality, primary repair using a modified Kessler core suture (4-0 Fiberwire or ethibond) with epitendinous suture (6-0 prolene) is performed. If there is significant contusion, thermal injury or poor tendon quality preventing primary repair, an EIP (extensor indicis proprius) to EPL transfer is the standard reconstruction. Post-operatively, the thumb IP joint is splinted in extension for 6 weeks with static and dynamic splinting to allow tendon healing. For delayed injuries not recognised intra-operatively, the same EIP transfer principle applies.

Wrist Arthroscopy — Exam Day Essentials

Clinical summary

Key Evidence

Triangular fibrocartilage complex lesions: a classification

Level V (Classification)
Palmer AK • J Hand Surg Am (1989)
Clinical Implication: Location dictates biology and therefore treatment: central (1A) lesions are avascular and debrided, peripheral/foveal (1B) lesions are vascular and repaired. The single most examined wrist-arthroscopy framework.
Verify on PubMed (PMID 2666492)

Intracarpal soft-tissue lesions associated with an intra-articular fracture of the distal end of the radius

Level IV (Case series)
Geissler WB, Freeland AE, Savoie FH, McIntyre LW, Whipple TL • J Bone Joint Surg Am (1996)
Clinical Implication: Establishes that a high proportion of intra-articular distal radius fractures harbour occult carpal ligament/TFCC injury and provides the arthroscopic grading scheme that guides whether SL/LT instability needs pinning, repair or observation.
Verify on PubMed (PMID 8613442)

Arthroscopic debridement of triangular fibrocartilage complex tears

Level II (Prospective cohort)
Osterman AL • Arthroscopy (1990)
Clinical Implication: Validated arthroscopic debridement as effective treatment for central, avascular TFCC perforations — the standard of care for Palmer 1A lesions where repair cannot heal.
Verify on PubMed (PMID 2363779)

New trends in arthroscopic management of type 1-B TFCC injuries with DRUJ instability

Level V (Treatment-oriented classification)
Atzei A • J Hand Surg Eur Vol (2009)
Clinical Implication: Refines management of foveal 1B tears: distal-only tears can be sutured to capsule, but tears with foveal detachment and DRUJ instability must be reattached to the fovea (suture anchor or transosseous) rather than simply repaired peripherally.
Verify on PubMed (PMID 19620186)

Arthroscopic versus open dorsal ganglion excision: a prospective, randomized comparison of rates of recurrence and of residual pain

Level I (Randomised controlled trial)
Kang L, Akelman E, Weiss AC • J Hand Surg Am (2008)
Clinical Implication: Best available evidence shows arthroscopic dorsal ganglion excision does NOT reduce recurrence compared with open surgery; the advantages are cosmetic and recovery-related. Counsel patients that recurrence is possible whichever approach is chosen.
Verify on PubMed (PMID 18406949)

References

  1. Palmer AK. Triangular fibrocartilage complex lesions: a classification. J Hand Surg Am 1989;14(4):594-606. PMID: 2666492. DOI: 10.1016/0363-5023(89)90174-3. [Landmark classification of TFCC lesions into traumatic (Class 1) and degenerative (Class 2) — the classification system used worldwide and tested in all major exams]

  2. Geissler WB, Freeland AE, Savoie FH, McIntyre LW, Whipple TL. Intracarpal soft-tissue lesions associated with an intra-articular fracture of the distal end of the radius. J Bone Joint Surg Am 1996;78(3):357-65. PMID: 8613442. DOI: 10.2106/00004623-199603000-00006. [Geissler arthroscopic grading system for scapholunate and lunotriquetral ligament injuries — the standard grading system for SL instability]

  3. Osterman AL. Arthroscopic debridement of triangular fibrocartilage complex tears. Arthroscopy 1990;6(2):120-4. PMID: 2363779. DOI: 10.1016/0749-8063(90)90012-3. [Prospective series (52 patients) — 73% complete pain relief; established arthroscopic debridement as standard of care for Class 1A central perforations]

  4. Atzei A. New trends in arthroscopic management of type 1-B TFCC injuries with DRUJ instability. J Hand Surg Eur Vol 2009;34(5):582-91. PMID: 19620186. DOI: 10.1177/1753193409100120. [Treatment-oriented sub-classification of Palmer 1B foveal tears guiding peripheral repair vs foveal reattachment vs reconstruction]

  5. Park JH, Kim D, Park JW. Arthroscopic one-tunnel transosseous foveal repair for triangular fibrocartilage complex (TFCC) peripheral tear. Arch Orthop Trauma Surg 2017;138(1):131-138. PMID: 29124362. DOI: 10.1007/s00402-017-2835-3. [16 Palmer 1B foveal repairs — significant improvement in pain, grip and Mayo/QuickDASH scores with restored DRUJ stability]

  6. Kang L, Akelman E, Weiss AC. Arthroscopic versus open dorsal ganglion excision: a prospective, randomized comparison of rates of recurrence and of residual pain. J Hand Surg Am 2008;33(4):471-5. PMID: 18406949. DOI: 10.1016/j.jhsa.2008.01.009. [Level I RCT — arthroscopic and open recurrence comparable at 12 months (about 11% vs 9%); basis for pre-operative counselling]