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Endoscopic carpal tunnel release: fourteen years’ experience with the MENON technique

ASL Roma E Polo Ospedaliero “Villa Betania” Ortopedia e Traumatologia Unità Operativa Chirurgia della Mano. Endoscopic carpal tunnel release: fourteen years’ experience with the MENON technique. ALFREDO DELL’UOMO M.D. 44° Congresso Nazionale Mano with Japanese Soc. - Milano, 13 ottobre 2006.

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Endoscopic carpal tunnel release: fourteen years’ experience with the MENON technique

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  1. ASL Roma EPolo Ospedaliero “Villa Betania” Ortopedia e TraumatologiaUnità Operativa Chirurgia della Mano Endoscopic carpal tunnel release: fourteen years’ experience with the MENON technique ALFREDO DELL’UOMO M.D. 44° Congresso Nazionale Mano with Japanese Soc. - Milano, 13 ottobre 2006

  2. The major thrust for endoscopic carpal tunnel release (E.C.T.R.), is based on the hypothesis that by selectively transecting T. C. ligament the post-op morbidity can be minimized allowing early return to A.D.L.

  3. ADVANTAGES & PECULIARITY

  4. Ulnarly located oblique incision: usually lies on the ulnar aspect of thepalmaris longus tendon

  5. It can be anatomically extended distally to perform an open procedure if technical difficult arise

  6. Tunnel is progressively dilataded using blunt dilatators, along the line of the fourth metacarpal

  7. Identification and continous visualization of the distal margin of T.C. ligament

  8. Original cannula “D” shaped in cross-section, prevents rotation of the cannula once inserted into the carpal tunnel. The distal end is blunt and closed.

  9. The transverse carpal ligament is divided by pushing the knife in a proximal to distal direction

  10. The knife is with central concave cutting edge of 2,3mm, with blunt corners

  11. Due to the configuration of the carpal tunnel, the tip of the cannula tends to point radially: pressure on the proximal part of the cannula…..

  12. …..will ensure that the tip rests against the hook of the hamate, thus preventig…..

  13. …..inadvertent pressure on the common digital nerve of the long and ring finger.

  14. This tecnique can be performed with the equipment available in any standard o. r.

  15. CONTROINDICATIONS • Recurrent carpal syndrome • Rheumatoid arthritis • Secondary C.T. syndrome due to space occupying lesions • Inadeguate intraoperative visualization

  16. Clinical data • 1007 hands (870 pz) • Age: 22 88 years (51 years) • Follow-up: 4 180 months • Open release on the opposite side: 88 Pz • Average operating time: 4-7 min • Endo to open (14 hands-1,35%)

  17. Criteria for evaluation of surgical outcome • Post operative pain • Resolution of sintoma (97%) • Post operative complication • Recovery of grip strenght • Appearance of new sintoma • Subjective evaluation

  18. F.E.S.S.H. • Fourth Congress 1997 • E.C.T.R. by Menon single portal technique: • clinical & M.R.I evaluation after 160 cases • Dell’Uomo, M. Mastantuono • Congresso Europeo Chirurgia della Mano

  19. M.R.I. measurements of the morphological changes after E.C.T.R. show that the volume increase parallels that open C.T.R. Follow-up show that the volume Increase is long lasting POST PRE

  20. COMPLICATIONS “Sindrome del tunnel carpale” Verduci 2002- Springer Verlag 2006 Prof. P. Bedeschi • Persistence of sintoma • Recurrence of sintoma • Appearance of new sintoma • - “skin scar” • - “pillar pain” • - neurological • - vascular • - etc

  21. Personal complications • 6 Neuroapraxia 3° digital nerve +/- • communicating branch ulnar nerve • 18 Hypotenar-pillar pain • 1 Superficial arch injury • 3 Second surgery

  22. Second surgery • Incomplete release –neuroapraxia 3° • NEUROLYSIS • complete relief • 2. Incomplete release–abundant scarring • NEUROLYSIS • no improvement • 3. Partial lesion of third digital nerve • NEUROLYSIS + DIRECT REPAIR • improvement

  23. Complcations of endoscopic and open carpal tunnel release A.K.Palmer – Journal of Hand Surgery (1999) Questionnaries to 1253 members of the American Society for Surgery of the Hand “… report ONLY on complications that they had themselves treated surgically”.

  24. NEUROLOGICAL COMPLICATIONS (5 YEARS) LACERATIONS: • MEDIAN NERVE • ULNAR NERVE • DIGITAL NERVE E.C.T.R. 265 O.C.T.R. 230 “The data support the conclusion that carpal tunnel release, be it endoscopic or open is not a safe and simple procedure”

  25. FINAL CONSIDERATIONS • E.C.T.R. with the Menon technique is a reliable alternative treatment to open release • Based on the data available, E.C.T.R. has less morbidity in the post-op period, than traditional release • Surgeons unfamiliar with arthroscopic techniques may find • the procedure tecnically demanding • T.C.L. can be adequate and safely sectioned, with high success rate and very few complications • If visualization is inadequate the surgeon must be prepared to performe an open release and should not risk injury to neurovascolar structures

  26. Thankyou

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