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Testicular Reimplantation — Operative Atlas

This is the operative atlas for testicular reimplantation across both major clinical scenarios. For the clinical-conditions framework (indications, outcomes synthesis, experimental cryopreserved-tissue context), see Testicular Reimplantation (clinical conditions). Related: Testicular Prosthesis, Testicular Torsion, Genital / Scrotal Trauma.

Two distinct operative scenarios:

  1. Testicular autotransplantation — for high intra-abdominal testes (cryptorchidism).
  2. Traumatic testicular replantation — after complete amputation / avulsion.

Both depend on microsurgical expertise and minimisation of ischemia time.

The operative details below preserve techniques reported in historical specialist series and individual cases. They are not a universal protocol: vessel selection, anastomotic method, cooling, anticoagulation, monitoring, and postoperative restrictions must be determined by the treating microvascular/urologic team.

A. Testicular Autotransplantation for Intra-Abdominal Testes​

Preoperative planning and patient selection​

Autotransplantation has been used for a high intra-abdominal testis that cannot reach the scrotum with conventional mobilization. The AUA guideline identifies primary orchiopexy and one- or two-stage Fowler–Stephens orchiopexy as the three usual repairs for a salvageable intra-abdominal testis; it separately notes that autotransplantation has been performed only sparingly. Selection therefore requires specialist assessment of anatomy, contralateral function, age, cancer risk, alternatives, and patient/family goals.[1][2]

Phase 1 — Abdominal dissection and testicular mobilisation​

  1. Access — traditionally via laparotomy; increasingly via laparoscopy or robotic-assisted (da Vinci system, four trocars oriented toward the ipsilateral lower quadrant).[3]
  2. Testicular dissection — testis identified intraperitoneally; gubernaculum divided; peritoneum overlying spermatic cord incised; testicular artery, testicular vein(s), and vas deferens individually identified and mobilised.
  3. Vas deferens preservation — the described autotransplantation techniques preserve the vas and its blood supply intact and mobilise enough length to reach the scrotum without tension.[4]
  4. Vessel preparation — gonadal (testicular) vessels isolated and mobilised as high as possible in the retroperitoneum to maximise proximal stump length; once adequate length achieved, vessels clipped and transected.[3]
  5. Recipient vessel preparation — deep inferior epigastric artery and vein identified in the rectus sheath / preperitoneal space and mobilised. Standard recipients due to reliable caliber, accessibility, and proximity to the inguinal canal.[5][6][7]

Phase 2 — Delivery and ischemia management​

  1. Testicular delivery — testis (now on vas-deferens pedicle only) and prepared inferior epigastric vessels delivered through an inguinal or lower-abdominal incision. If robotic, robot undocked at this point.[3]
  2. Hypothermia — historical techniques describe cooling with cold saline-soaked gauze or ice slush during the anastomotic phase. The numeric temperature/time effects below come from animal ischemia models and should not be treated as validated human thresholds.[4][8]

Phase 3 — Microsurgical vascular anastomosis (critical phase)​

Requires an experienced microvascular surgeon.

  1. Microscope setup — typically 25–40× magnification.[5][1]
  2. Arterial anastomosis (testicular artery → inferior epigastric artery):
    • End-to-end using interrupted mattress sutures with 9-0 or 10-0 monofilament nylon.[3][6][1]
    • Mattress stitches specifically accommodate the caliber mismatch between smaller testicular artery and larger inferior epigastric artery.[6]
    • Minimal adventitial stripping — only enough to prevent intimal flap formation.[9]
    • Typically 6–8 interrupted sutures circumferentially.
    • The Boeckx series (25 procedures; 96% reported graft survival) used end-to-end anastomosis and emphasized managing caliber discrepancy; its specialist-series result is not a generalizable success probability.[6]
  3. Venous anastomosis (testicular vein → inferior epigastric vein):
    • Also end-to-end.
    • May use running 9-0 nylon (as in robotic-assisted technique) or interrupted sutures.[3][10]
    • Generally technically easier due to larger caliber but equally critical — venous congestion / infarction was the cause of failure in the Wacksman series.[10]
  4. Patency confirmation — clamps released; visual confirmation (pulsatile arterial flow, venous filling) + intraoperative Doppler. Some series have used postoperative radionuclide scanning or selective arteriography to verify anastomotic patency.[3][7]

Phase 4 — Orchiopexy and closure​

  1. Scrotal fixation — revascularised testis passed through the inguinal canal (or a neo-hiatus) into the ipsilateral hemiscrotum and fixed inferiorly and laterally within a dartos pouch using standard orchiopexy technique.[3]
  2. Closure — all incisions closed in layers.

Reported operative times (autotransplantation)​

ParameterTypical value
Total operative time~ 4.25 h
Vascular anastomosis phase40–90 min

These figures come from Bukowski's 17-year specialist series (23 patients, 27 testes), not a contemporary benchmark or required time window.[15]

B. Traumatic Testicular Replantation​

This is a rare emergency after complete testicular amputation. BAUS consensus recommends early specialist referral when replantation may be possible, with microvascular support and fertility-preservation planning; published evidence remains case-based.[17][18]

Specimen preservation (prehospital / transit)​

  • Amputated testis wrapped in saline-moistened gauze, sealed bag, on ice (not directly on ice to avoid freezing injury).
  • Successful case reports describe total ischemia of 4 h 20 min (Altarac) and 6 h (Xu). These cases show feasibility, not a safe universal cutoff; injury mechanism, warm/cold exposure, vessel damage, and specialist availability all matter.[11][12]

Surgical technique​

  1. Wound exploration and debridement — spermatic-cord stump identified, debrided of nonviable tissue; testicular artery, pampiniform plexus veins, vas deferens individually identified under the microscope.
  2. Specimen preparation — severed ends of testicular artery, veins, and vas identified and freshened.
  3. Microsurgical reanastomosis:
    • Arterial — end-to-end anastomosis of testicular-artery stumps using 9-0 or 10-0 nylon under the operating microscope.
    • Venous — anastomosis of one or more suitable pampiniform-plexus veins has been described; the number and configuration are case-specific, with adequate outflow as the goal.
    • Vas deferens — standard vasovasostomy technique (two-layer or modified one-layer with 9-0 or 10-0 nylon for mucosal layer).
  4. Confirmation of perfusion — visual testicular colour change (dusky / pale → pink); Doppler confirmation of arterial inflow.
  5. Orchiopexy — replanted testis fixed in the scrotum.

Xu 1988 illustrative case — bilateral funiculus completely severed (one 0.8 cm proximal to upper pole, the other at funiculus-testis junction). Right-sided testis successfully replanted with total ischemia 6 h; biopsy at 120 d showed germ cells in various stages of development and normal Leydig cells.[12]

Ischemia Tolerance — Experimental Data​

Animal-model conditionReported germinal-epithelium preservation
2 h normothermicNo significant destruction
4 h normothermic25%
6 h normothermic8%
4 h hypothermic (4 °C)90%
6 h hypothermic (4 °C)85%
Rabbit model — optimal cold ischemia4 h recommended[13]

These values derive from animal ischemia/reperfusion studies and do not define a human treatment window. Human traumatic-replantation evidence consists of rare cases and low-level consensus.[8][13][17][18]

Technical Pearls and Pitfalls​

  • Vessel size mismatch — testicular artery 0.5–1.0 mm; inferior epigastric artery larger. Mattress sutures or fish-mouth incisions at the smaller-vessel end accommodate the discrepancy.[6]
  • Arterial thrombosis — a reported cause of graft failure; anastomotic technique, vessel quality, ischemic injury, and postoperative factors may all contribute.[6]
  • Venous congestion — a reported failure mechanism in early series; establish adequate outflow using the recipient and donor vessels available in the individual case.[10]
  • Antispasmodics — historical microsurgical descriptions include topical papaverine or lidocaine; agent selection and dosing are local microvascular decisions.
  • Anticoagulation — systemic heparin and/or heparinized irrigation appear in historical protocols, but this page does not establish a standard dose; balance bleeding and thrombosis risks with the microvascular team.
  • Avoid tension and kinking — arrange the pedicle and anastomoses to minimize mechanical compromise.
  • Postoperative management — Chao's single robotic-assisted case used two days of bed rest, discharge on postoperative day 7, and surveillance; this is a case protocol rather than a minimum standard. Serial clinical/Doppler assessment is tailored locally.[3]
  • Modified-interrupted suturing technique (Huang 2020) — a general small-vessel technical note describes resting the needle on the vessel wall between passes; it is an extrapolated microsurgical option, not comparative testicular-autotransplantation evidence.[14]

Robotic-Assisted Approach (Chao 2022)​

Chao reported one 18-year-old with a solitary intra-abdominal testis: robotic intra-abdominal dissection and vessel mobilisation, followed by undocking for microsurgical anastomosis under an operating microscope. At more than 1 year, the testis remained palpable and stable in size and serum testosterone was unchanged. This is a technical case report, not a comparative series.[3]

Outcomes Summary​

Autotransplantation outcomes reported by historical series​

SeriesReported nReported anatomical / graft outcomeFollow-up
Bukowski 17-yr review[15]27 testes96% success as defined by the authorsVariable
Boeckx[6]25 procedures96% graft survival as defined by the authorsMean 24 mo
Harrison[1]12100% of those followed6–30 mo
Wacksman[10]7 patients / 8 testes6 of 7 patients reported successfulVariable
Upton[16]1060% as defined by the authorsVariable

These small, selected, expert-center series use heterogeneous definitions and follow-up. They support technical feasibility but do not establish normal adult fertility, lifetime endocrine function, or a contemporary center-level success probability.

Traumatic replantation​

Starmer 2018 review identified only 8 reported traumatic-replantation cases. Across all 11 patients receiving any reviewed fertility-preservation approach (replantation, testicular sperm extraction, or cryopreservation), viable sperm were found in 5 of 11; that fraction is not a replantation-specific success rate. Prolonged ischemia and extensive crush injury were common reasons for replantation failure.[17]

Evidence Limitations​

  • All series are small and retrospective; no RCTs.
  • Autotransplantation outcomes dominated by single-centre series with experienced microvascular teams; generalisability to lower-volume centres uncertain.
  • Robotic-assisted Chao 2022 report is one technical case — long-term comparative outcomes vs open microsurgery are not established.[3]
  • Traumatic replantation evidence is limited to ~ 8 published cases; standardised reporting and PROMs absent.[17]
  • Long-term fertility outcomes post-autotransplantation are sparsely reported.

References​

1. Harrison CB, Kaplan GW, Scherz HC, Packer MG, Jones J. Microvascular autotransplantation of the intra-abdominal testis. J Urol. 1990;144(2 Pt 2):506–507; discussion 512–513. doi:10.1016/s0022-5347(17)39504-6

2. Kolon TF, Herndon CD, Baker LA, et al. Evaluation and treatment of cryptorchidism: AUA Guideline. J Urol. 2014;192(2):337–345. doi:10.1016/j.juro.2014.05.005

3. Chao BW, Shakir NA, Hyun GS, Levine JP, Zhao LC. Robotic-assisted testicular autotransplantation. Urology. 2022;159:255. doi:10.1016/j.urology.2021.09.020

4. Shioshvili TI. Bilateral abdominal cryptorchidism in males: autotransplantation of the testis. Eur Urol. 1985;11(6):386–387. doi:10.1159/000472546

5. Giuliani L, Carmignani G. Microsurgical testis autotransplantation. A critical review. Eur Urol. 1983;9(3):129–132. doi:10.1159/000474066

6. Boeckx W, Vereecken R, Depuydt K. Microsurgery for intra-abdominal testicular retention. Eur J Obstet Gynecol Reprod Biol. 1998;81(2):191–196. doi:10.1016/s0301-2115(98)00190-0

7. Martin DC, Salibian AH. Orchiopexy using microvascular surgical technique. J Urol. 1980;123(3):435–436. doi:10.1016/s0022-5347(17)55972-8

8. Miller DC, Peron SE, Keck RW, Kropp KA. Effects of hypothermia on testicular ischemia. J Urol. 1990;143(5):1046–1048. doi:10.1016/s0022-5347(17)40180-7

9. Urbaniak JR, Soucacos PN, Adelaar RS, Bright DS, Whitehurst LA. Experimental evaluation of microsurgical techniques in small artery anastomoses. Orthop Clin North Am. 1977;8(2):249–263.

10. Wacksman J, Dinner M, Handler M. Results of testicular autotransplantation using the microvascular technique: experience with 8 intra-abdominal testes. J Urol. 1982;128(6):1319–1321. doi:10.1016/s0022-5347(17)53481-3

11. Altarac S. A case of testicle replantation. J Urol. 1993;150(5 Pt 1):1507–1508. doi:10.1016/s0022-5347(17)35828-7

12. Xu YM, Wu P, Cai PC, Cheng ZC. Replantation of the testis: report of a case. J Urol. 1988;139(3):596–598. doi:10.1016/s0022-5347(17)42539-0

13. Qian HJ, Du XJ, Zhang C, et al. Cold ischemia time influences spermatogenesis in a testicular ischemia/reperfusion injury model. Transplant Proc. 2010;42(5):1610–1613. doi:10.1016/j.transproceed.2009.12.058

14. Huang HK, Wang JP, Tu YK. A modified "interrupted" method with resting of the suture needle on the vessel wall for microvascular anastomosis. Microsurgery. 2020;40(1):89–90. doi:10.1002/micr.30522

15. Bukowski TP, Wacksman J, Billmire DA, Lewis AG, Sheldon CA. Testicular autotransplantation: a 17-year review of an effective approach to the management of the intra-abdominal testis. J Urol. 1995;154(2 Pt 1):558–561.

16. Upton J, Schuster SR, Colodny AH, Murray JE. Testicular autotransplantation in children. Am J Surg. 1983;145(4):514–519. doi:10.1016/0002-9610(83)90050-8

17. Starmer BZ, Baird A, Lucky MA. Considerations in fertility preservation in cases of testicular trauma. BJU Int. 2018;121(3):466–471. doi:10.1111/bju.14084

18. Lucky M, Brown G, Dorkin T, et al. British Association of Urological Surgeons consensus document for the management of male genital emergencies — testicular trauma. BJU Int. 2018;121(6):840–844. doi:10.1111/bju.14163