Back to Operative Surgery
Hand & Upper Limb

EIP-to-EPL Tendon Transfer (EPL Rupture)

Complete surgical technique guide for EIP-to-EPL tendon transfer for EPL rupture after distal radius fracture — includes EPL rupture aetiology, EIP anatomy, transfer technique, tension setting, and post-operative management — FRCS/FRACS/EBOT exam preparation

Core Procedure
intermediate
By OrthoVellum Medical Education Team

Reviewed by OrthoVellum Editorial Team

Editorial maintenance, source checking, and correction workflow • Published by OrthoVellum Medical Education Team

Editorial boardMethodologyReview policyReport a correction
High-yield overview

Spontaneous EPL rupture after distal radius fracture | Intermediate

Surgical Imaging

EPL rupture at Listers tubercle
Spontaneous extensor pollicis longus (EPL) rupture: the tendon hooks around Lister’s tubercle in the third extensor compartment, where attrition and ischaemia rupture it 6–8 weeks after a distal radius fracture — the frayed ends retract and the thumb drops.Credit: AI-generated medical image · OrthoVellum
EIP to EPL tendon transfer routing and Pulvertaft weave
EIP harvested at the index MCP and rerouted to the EPL distal stump with a Pulvertaft weave. Tension is set with the wrist neutral and thumb in full extension (IP held ~10–15° hyperextension).Credit: AI-generated medical image · OrthoVellum
Dropped thumb deformity from EPL rupture
Clinical “dropped thumb”: loss of thumb IP and MCP extension following EPL rupture, with normal extension of the other digits.Credit: via Open-i (NIH), CC BY
Surgical incisions for EIP to EPL transfer
Dorsal incisions for EIP harvest and routing to the EPL stump over the dorsum of the hand and wrist.Credit: via Open-i (NIH), CC BY

Critical Concepts and Exam Traps

EPL Rupture Timing (6–8 Weeks)

Spontaneous EPL rupture classically occurs 6–8 weeks after distal radius fracture — including non-displaced and minimally displaced fractures managed conservatively. The mechanism is ischaemia from haematoma compressing the 3rd extensor compartment at Lister's tubercle, combined with abrasion on the irregular fracture callus surface. Examine every distal radius fracture patient at 6 weeks for EPL integrity (lift-off test).

Why Direct Repair Fails

EPL rupture is an attritional/ischaemic rupture — not a clean laceration. The tendon ends are frayed, necrotic, and retracted. There is a significant gap defect (2–4 cm) that cannot be bridged without unacceptable tension. Even if ends could be approximated, the tissue quality is poor and re-rupture rate is very high. This is why EIP-to-EPL transfer (or free tendon graft) is the gold standard — rather than direct repair.

EIP Test (Fist and Extend)

EIP is tested by asking the patient to make a full fist (flex all fingers) and then independently extend the index finger. In a fist, EDC to index is kept passively extended by the retinacular system — only EIP can actively extend the index MCP in this position. Confirm EIP is functioning before planning transfer. Note: EIP lies ulnar to EDC to index at the MCP level — important for correct identification during harvesting.

Tension Setting — Critical Step

Tension is the most technically demanding step. Correct tension: with wrist at neutral and thumb in full extension, the transferred EIP should hold the thumb IP joint in approximately 10–15° hyperextension. Too loose = no active thumb IP extension post-operatively. Too tight = thumb IP joint held in fixed flexion (paradoxically flexed — tenodesis effect). Test intraoperatively by moving the wrist from flexion to extension and observing thumb IP motion (tenodesis test).

Lister's Tubercle Anatomy

Lister's tubercle is a bony prominence on the dorsal distal radius. The 3rd extensor compartment (EPL) runs in the groove on the ulnar side of Lister's tubercle, then angles radially to the thumb. The tubercle acts as a pulley redirecting EPL. In distal radius fractures, haematoma accumulates in this tight compartment, compressing EPL. In ORIF, the tubercle may be displaced or excised, also placing EPL at risk.

RA-Related EPL Rupture

EPL rupture also occurs in rheumatoid arthritis from dorsal wrist tenosynovitis at Lister's tubercle. Key differences: (1) May be bilateral, (2) Active synovitis must be treated (synovectomy at transfer), (3) Extensor retinaculum may need to be reconstructed or transposed beneath the tendons to protect the repair, (4) Check adjacent extensors (EDC to ring/little) as RA causes multiple simultaneous ruptures — Vaughan-Jackson syndrome (ulnar cascade).

Mnemonic

E-P-LEPL — Aetiology of Rupture

Hook:EPL rupture = three settings: post-fracture (conservative management), post-ORIF (hardware abrasion), and RA (tenosynovitis). The classic exam question is post-fracture at 6–8 weeks after an apparently well-managed non-displaced fracture.

Mnemonic

T-R-A-N-S-F-E-RTRANSFER — EIP-to-EPL Technique

Hook:TRANSFER in order = the 8 steps of EIP-to-EPL in sequence. The most important steps are T (test donor first) and F (set correct tension). Tension errors are the commonest cause of poor outcome.

Indications for EIP-to-EPL Transfer

Primary Indication: EPL rupture with inability to actively extend thumb IP joint

  • Spontaneous EPL rupture after distal radius fracture (most common — conservative or operatively managed)
  • EPL rupture in rheumatoid arthritis (after failed synovectomy or presenting with rupture)
  • Iatrogenic EPL rupture after ORIF distal radius (plate prominence, retractor injury)
  • Delayed presentation (greater than 3 weeks from rupture) — direct repair not feasible
  • Any EPL rupture with gap defect or poor tissue quality

Why EIP Transfer is Preferred Over Free Graft

EIP Transfer vs Free Tendon Graft for EPL Rupture

Evidence Base

A New Method to Control Tendon Tension in EIP-to-EPL Transfer

Level III
Lee JH, Cho YJ, Chung DW • Annals of Plastic Surgery
Clinical Implication: Set tension with the wrist neutral and the thumb IP in full extension (slight over-tension) — coapting in neutral leaves a residual extension lag. This is the strongest direct evidence for the tension target taught in this topic.
Verify on PubMed (PMID 26418770)

Evaluation of Restoration of Extensor Pollicis Function by Transfer of the Extensor Indicis

Level IV
Lemmen MH, Schreuders TA, Stam HJ, Hovius SE • Journal of Hand Surgery (British)
Clinical Implication: EIP transfer reliably restores useful thumb extension with acceptable, mostly subclinical donor morbidity. Counsel patients that independent index extension is preserved but index extension strength drops modestly.
Verify on PubMed (PMID 10190604)

Wide-Awake vs Conventional EIP-to-EPL Transfer for Chronic EPL Rupture

Level III
Hong JJ, Kang HJ, Whang JI, et al. • Plastic and Reconstructive Surgery
Clinical Implication: Performing the transfer under wide-awake local anaesthesia lets you tension dynamically against active thumb extension before closure, improving early range of motion — a recognised refinement of the standard technique.
Verify on PubMed (PMID 32097314)

Rupture of the Extensor Pollicis Longus Tendon

Level IV
Bonatz E, Kramer TD, Masear VR • American Journal of Orthopedics
Clinical Implication: Confirms the classic post-fracture rupture timing (~7 weeks) and that both EIP transfer and free PL graft give good results — EIP transfer is preferred as a single-stage powered transfer.
Verify on PubMed (PMID 8640381)

Risk Factors for EPL Rupture Following Non-Displaced Distal Radius Fractures

Level IV
Saito T, Furutani T, Nakamichi R, et al. • Injury
Clinical Implication: Be especially vigilant for EPL rupture when the fracture line lies distal to Lister's tubercle. Reported incidence after non-displaced fractures ranges ~0.07–5% (Bogart 2020, PMID 30550417).
Verify on PubMed (PMID 40449182)

When to Perform Surgery

  • Surgery should be performed as soon as possible after diagnosis — ideally within 6–12 weeks of rupture
  • Beyond 12 weeks: intrinsic contracture of FPL begins to develop; EPL muscle belly loses excursion
  • At any point: surgery is worthwhile even in delayed presentations; set expectations that outcome is better the sooner it is done

Clinical Pearl

Examiner Classic: "Why do we not repair EPL directly after spontaneous rupture from a distal radius fracture?"

Model Answer: "EPL rupture in this context is an attritional ischaemic rupture — not a clean tendon laceration. The mechanism is haematoma compressing EPL in the tight 3rd extensor compartment at Lister's tubercle, combined with abrasion against the irregular fracture surface. This produces tendon necrosis, fraying, and a significant gap defect of 2–4 cm. Even if you approximate the ends under tension, you are suturing frayed necrotic tissue and the repair will invariably fail. Therefore the gold standard is EIP-to-EPL transfer — a functioning musculotendinous unit that bypasses the scarred/damaged EPL entirely."


Clinical Decision Scenarios

Use these scenarios to practise clinical reasoning and management decisions

CLINICAL SCENARIOStandard

CLINICAL PROMPT

"A 55-year-old woman fell on her outstretched hand 8 weeks ago and was treated conservatively for a non-displaced distal radius fracture. She now presents with inability to extend her thumb. What is the diagnosis and how do you manage it?"

PRACTICAL APPROACH
This is the classic presentation of spontaneous EPL rupture after distal radius fracture. The history — non-displaced fracture managed conservatively, followed by loss of thumb extension at 6–8 weeks — is pathognomonic. I confirm the diagnosis clinically: the EPL lift-off test is positive (she cannot lift the thumb off a flat table with the palm down), and the IP joint drops into flexion under gravity. I assess for residual radial-sided wrist pain, any other tendon deficits, and neurovascular status of the hand. Investigation: plain X-rays confirm the distal radius fracture has healed; no further imaging is routinely required. Management: this is a surgical condition. Direct repair is not indicated — the rupture is attritional with a gap defect and poor tissue quality; direct repair will fail. I would arrange EIP-to-EPL tendon transfer as an elective procedure within 4–8 weeks. I counsel the patient about the operation, 4–6 week splinting recovery, and expected outcome of 85–90% restoration of thumb IP extension with minimal index deficit. I check EIP is functioning (fist test) and document this in my clinical note.
CLINICAL SCENARIOStandard

CLINICAL PROMPT

"Describe how you test EIP clinically and why this is important before performing EIP-to-EPL transfer. What would you do if EIP were absent or damaged?"

PRACTICAL APPROACH
EIP testing is essential before planning the transfer to confirm there is a functioning donor. The test is performed as follows: I ask the patient to make a full fist — all four fingers fully flexed. In this position, the common EDC to all fingers is kept passively extended by the retinacular system and cannot generate active extension. Then I ask the patient to extend the index finger while keeping the other fingers in a fist. The only muscle capable of doing this is EIP, because it has an independent muscle belly distinct from EDC. If the patient can extend the index finger with other fingers fisted, EIP is present and functional. If they cannot, EIP may be absent (anatomical variant in approximately 0.5%) or may have been injured. It is important because EIP is the standard donor for EPL transfer — if it is not functioning, I cannot proceed with EIP transfer. If EIP is absent or damaged, alternatives are: (1) Palmaris longus free graft — harvest PL from the wrist, use as a bridging graft from proximal EPL motor stump to distal EPL stump (requires PL to be present; absent in 10–15%); (2) Plantaris free graft — rare but available; (3) Free graft from the extensor digitorum brevis; (4) EIM (extensor indicis manus) — a rare variant. In practice, if PL is present and EIP is unavailable, PL free graft is my first alternative.
CLINICAL SCENARIOAdvanced

CLINICAL PROMPT

"At 6 weeks post EIP-to-EPL transfer, the patient demonstrates active wrist extension but the thumb IP joint drops into flexion. She cannot actively extend the thumb IP. What has happened and what is your management?"

PRACTICAL APPROACH
This is the classic presentation of an over-tight or incorrectly tensioned transfer — or alternatively, the transfer has ruptured. I need to differentiate these clinically. First, I assess passive IP extension: if I can passively extend the IP fully (the joint is supple), the problem is most likely a tendon failure or insufficient tension. If the IP cannot be passively extended to neutral, the transfer may be too tight and is holding the IP in flexion by tenodesis effect. With the wrist in neutral, I ask the patient to actively extend the thumb IP — if there is no active extension whatsoever, either the transfer has ruptured (no force transmission), or it is too tight (paradoxically preventing extension). Key test: with wrist flexed passively to 30°, does the IP extend passively? If yes, this is a tenodesis effect from too-tight transfer. If no, the transfer has probably ruptured. I also perform the tenodesis test: wrist into flexion causes IP extension in a normally tensioned transfer. Management: if transfer failure (rupture or non-healing Pulvertaft weave), I return to theatre for revision — ideally within 3–6 weeks of diagnosis before fibrosis develops. I revise the weave with additional passes and re-set the tension correctly at wrist neutral with thumb fully extended. If the transfer is too tight, I return to theatre and release one or two of the Pulvertaft sutures to reduce tension and re-set. If the transfer is intact but function has not recovered, I ensure rehabilitation is appropriate and continue for 3 months before considering revision.

EIP-to-EPL Transfer (EPL Rupture) — Exam Summary

Clinical summary

References

  1. Lemmen MH, Schreuders TA, Stam HJ, Hovius SE. Evaluation of restoration of extensor pollicis function by transfer of the extensor indicis. J Hand Surg Br. 1999;24(1):46–49. PMID: 10190604 · DOI: 10.1016/s0266-7681(99)90025-6

  2. Lee JH, Cho YJ, Chung DW. A new method to control tendon tension in the transfer of extensor indicis proprius to extensor pollicis longus rupture. Ann Plast Surg. 2015;75(6):607–609. PMID: 26418770 · DOI: 10.1097/SAP.0000000000000593

  3. Hong JJ, Kang HJ, Whang JI, et al. Comparison of the wide-awake approach and conventional approach in extensor indicis proprius-to-extensor pollicis longus tendon transfer for chronic extensor pollicis longus rupture. Plast Reconstr Surg. 2020;145(3):723–733. PMID: 32097314 · DOI: 10.1097/PRS.0000000000006611

  4. Bonatz E, Kramer TD, Masear VR. Rupture of the extensor pollicis longus tendon. Am J Orthop (Belle Mead NJ). 1996;25(2):118–122. PMID: 8640381

  5. Saito T, Furutani T, Nakamichi R, et al. Risk factors for extensor pollicis longus tendon rupture following non-displaced distal radius fractures. Injury. 2025;56(8):112454. PMID: 40449182 · DOI: 10.1016/j.injury.2025.112454

  6. Bogart R, Vidlock K. Ruptured extensor pollicis longus tendon after a nondisplaced distal radius fracture in a young adult soccer player. Clin J Sport Med. 2020;30(1):e23–e24. PMID: 30550417 · DOI: 10.1097/JSM.0000000000000708

  7. Ha C, Hong IT, Oh CH, Ryu HS, Chung J, Han SH. Clinical outcomes of extensor indicis proprius tendon transfer for extensor pollicis longus tendon rupture. J Hand Surg Eur Vol. 2024;49(10):1243–1249. PMID: 38296255 · DOI: 10.1177/17531934241226949