Dwayne H Rodgerson

Texas A&M University, College Station, Texas, United States

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Publications (34)32.34 Total impact

  • Rolf B Modesto · Dwayne H Rodgerson · Amanda E Masciarelli · Michael Spirito ·
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    ABSTRACT: This retrospective study describes placement of distal radial transphyseal screws in Thoroughbred yearlings with carpal varus deformities while standing, and identifes short- and long-term complications following the procedure. Data gathered from 2009 to 2013 identified 8 yearlings that met the inclusion criteria. Horses were sedated intravenously and a single 4.5-mm cortical screw was placed in the distal lateral radial physis following application of local anesthetic and surgical preparation of a pre-placed hole. All horses were evaluated weekly after surgery and screw removal was performed standing and under sedation when correction of the angular limb deformity was achieved. The mean time for screw removal was 46 days. No short- or long-term complications were identified. Findings indicate that placing a single transphyseal screw in the lateral aspect of the distal radial physis with the horse standing is a viable option to treat varus angular limb deformity of the carpus in horses.
    The Canadian veterinary journal. La revue veterinaire canadienne 06/2015; 56(6):605-9. · 0.52 Impact Factor
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    ABSTRACT: Objective To describe the use of a wire snare technique for epiglottic entrapment.Study DesignCase series.AnimalsEight adult horses.Methods Under general anesthesia, a modified mouth gag was placed in the oropharynx. An endoscope was passed through the gag until there was adequate visualization of the entrapped epiglottis. The entrapping mucosa was grasped with bronchoesophageal forceps and pulled rostrally, releasing the epiglottis. A custom snare was passed down the bronchoesophageal forceps to encircle the redundant subepiglottic mucosa. Tension was applied to the entrapping mucosa via the forceps as the obstetric wire was tightened at the base and the redundant mucosa (aryepiglottic fold) was excised.ResultsThe procedure was performed on 8 adult thoroughbred horses. Re-evaluation by endoscopy did not show entrapment in any horse and no horse developed complications or has had problems with performance.Conclusions This technique is a minimally invasive, competitively priced and straightforward method for resection of entrapping subepiglottic mucosa in adult horses.
    Veterinary Surgery 10/2014; 44(3). DOI:10.1111/j.1532-950X.2014.12280.x · 1.04 Impact Factor
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    ABSTRACT: To (1) describe a surgical technique for repair of lacerations of the ventral aspect of the cervix in anesthetized mares in Trendelenburg position; and (2) report conception rates and foaling after repair. Case series. Mares (n = 18). Cervical lacerations were repaired in 2 layers with anesthetized mares in Trendelenburg position. The cervix was retracted caudally with stay-sutures, and after excision of the healed margin of the laceration, the internal cervical mucosa and fibromuscular tissue were sutured in 1 layer with a continuous Lembert pattern. The external cervical mucosa was sutured using a simple-continuous suture pattern. Number of foals produced by each mare before and after surgical repair was obtained from client/farm communication and from a commercial record keeping service. Mean repair time for 1 laceration was 22 minutes and for 2 lacerations was 29 minutes. Nine mares conceived and 7 had at least 1 live healthy foal. Trendelenburg position allows for efficient repair of a ventrally located cervical laceration in anesthetized mares.
    Veterinary Surgery 07/2013; 42(6). DOI:10.1111/j.1532-950X.2013.12037.x · 1.04 Impact Factor
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    ABSTRACT: To describe the characteristics of osteomyelitis lesions of the patella and to report short- and long-term outcome after treatment in 8 foals. Retrospective case series. Foals (n = 8). Medical records (2003–2007) and radiographs of foals that had osteomyelitis of the patella were reviewed. Inclusion criteria included clinical, radiographic, and surgical findings consistent with osteomyelitis of the patella, and a long-term follow-up of >15 months. Information acquired included signalment, hematologic and serum biochemical profile results, clinical and radiographic signs, surgical technique and perioperative treatment. Follow-up radiographs were evaluated and outcome was determined from veterinary examination, race records, and telephone questionnaire. Six foals survived long term (15 months–4 years); all had intralesional and systemic antimicrobial therapy, along with synovial lavage and antimicrobial medication. All were sound and achieved either yearling sales (n=3), show hunter or racing (2). Two foals died in the short term from renal failure and suppurative peritonitis secondary to cecal perforation, 1 remaining lame with suppurative osteonecrosis confirmed at necropsy. This foal was not administered intralesional antimicrobial therapy. Prompt medical and surgical therapy for osteomyelitis of the patella can result in a good prognosis for soundness and a potential athletic career. Concurrent septicemia or other systemic perinatal disease can result in prolonged therapy and delayed recovery.
    Veterinary Surgery 01/2012; 41(2). DOI:10.1111/j.1532-950X.2011.00937.x · 1.04 Impact Factor
  • Jacob T Goodin · Dwayne H Rodgerson · Jorge H Gomez ·
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    ABSTRACT: To review the efficacy and safety of unilateral ovariectomy by use of a standing hand-assisted laparoscopic approach and evaluate the effect of ovary size on posttransection hemorrhage after application of a linear stapling device. Case series. Horses (n=65) aged 2-20 years. Medical records of mares that had ovariectomy performed by use of a standing hand-assisted laparoscopic approach were reviewed. Data retrieved were signalment, ovary removed (left, right), ovarian size, ovarian pathology, intraoperative and postoperative complications, and length of hospitalization. Mean ovarian diameter was 17 cm. Histopathology (52 mares) confirmed 41 granulosa cell tumors (79%), 8 ovarian cysts (15%), 1 teratoma (2%), and 2 ovaries (4%) without abnormalities. Hemorrhage was observed laparoscopically in 16 mares after transection of the mesovarium. Complications encountered during surgery included 1 mare collapsing in the stocks and 1 mare that hemorrhaged excessively from the incision. Postoperative complications included 2 cases of mild colic. Overall complication rate was 6%. All attempts to remove the target ovary were successful. The approach is safe for the mare, as complications encountered were similar to those recently reported for other approaches.
    Veterinary Surgery 01/2011; 40(1):90-2. DOI:10.1111/j.1532-950X.2010.00771.x · 1.04 Impact Factor
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    Alfredo E Romero · Dwayne H Rodgerson ·
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    ABSTRACT: Diaphragmatic rent and visceral herniation in the horse is seldom diagnosed, but historically carries a poor prognosis. The objective of this study was to document the presentation and surgical management of all diaphragmatic rents as presented to 2 referral institutions over a 5-year period. A review of 31 cases demonstrated that even with advances in surgical management of abdominal and thoracic conditions, little has been done to change the prognosis for this condition. Success rate was 23% for all horses presented for colic and were ultimately diagnosed with a diaphragmatic hernia, and 46% for those cases for which surgical management was elected.
    The Canadian veterinary journal. La revue veterinaire canadienne 11/2010; 51(11):1247-50. · 0.52 Impact Factor
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    Alfredo Romero · Dwayne H Rodgerson · Genevieve L Fontaine ·
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    ABSTRACT: A 3-year-old Thoroughbred was presented for evaluation of hematuria post exercise. On physical examination, an enlarged kidney was identified, as well as serum biochemical abnormalities such as an elevated creatine kinase (CK) and hypoalbuminemia. The kidney was removed laparoscopically and a nephroblastoma was identified.
    The Canadian veterinary journal. La revue veterinaire canadienne 06/2010; 51(6):637-9. · 0.52 Impact Factor
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    ABSTRACT: To determine outcome after medical or surgical treatment of postpartum mares with confirmed or presumptive uterine tears. Case series. Postpartum mares were included if foaling had occurred within 7 days and uterine tear was confirmed surgically or, in medically treated mares, by palpation or presumed based on peritonitis. Information (age, breed; physical examination, laboratory and abdominocentesis findings; treatment, survival rates, length of hospital stay, treatments costs, and breeding performance after discharge) was obtained from the medical records (1990-2007). The influence of variables was compared between medical and surgical treatment, and between survivors and nonsurvivors. For 49 mares, survival was 75%, with no significant difference between medical (11/15; 73%) or surgical (26/34; 76%) treatment. Admission variables, treatment cost, duration of hospital stay, and likelihood of foaling after discharge were not significantly different between treatment groups. Nonsurvivors were significantly more likely to have gastric reflux, higher heart rate, anion gap, lower total CO(2), and leukocyte count, compared with survivors. Tears were significantly (P=.018) more likely to occur in the right uterine horn than in other parts of the uterus. Uterine tears occur more commonly in the uterine horns, more so the right horn, and survival is similar with surgical or medical treatment of uterine tears in postpartum mares. Medical treatment may be a reasonable alternative to surgical treatment for uterine tears, although the severity of tear that can resolve with medical treatment is unknown, and medical therapy can be as expensive as surgical treatment.
    Veterinary Surgery 02/2010; 39(2):254-60. DOI:10.1111/j.1532-950X.2010.00645.x · 1.04 Impact Factor
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    ABSTRACT: Cranio-cervical dislocation is a good option in the management of post-fixation twins, producing a single normal sized healthy foal in 63.16% of cases. Authors' addresses: Hagyard Equine Medical Institute, 4250 Iron Works Pike, Lexington, Kentucky 40511 (Wolfsdorf, Rodgerson, Holder); and Department of Agriculture, University of Kentucky, Lexington, Kentucky 40502 (Schoergendorf); e-mail: KWolfsdorf@Hagyard.com (Wolfsdorf). © 2009 AAEP.
  • Alastair T Kay · Michael A Spirito · Dwayne H Rodgerson · Stuart E Brown ·
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    ABSTRACT: To describe a surgical technique for repair of grade IV rectal tears after parturition in mares and to report outcome. Clinical report. Horses (n=6) with grade IV rectal tears. Mares were sedated and restrained in standing stocks. After caudal anesthesia and evacuation of feces from the rectum, the perineal region was aseptically prepared. Four stay sutures were placed through the external anal sphincter before vertical transection (12 o'clock). Caudal retraction of the tear was performed using Allis tissue forceps (5 mares) or stay sutures before accurate apposition of the tear margins with steel staples below the tissue forceps. The mucosal edges were then sharply dissected leaving approximately 5 mm edges which were apposed in a single layer (2-0 poliglecaprone 25) before stapler release. In 1 mare, the rectal tear was identified and apposed using a 2-layer hand-sutured closure. Systemic antibiotics and anti-inflammatory agents were administered postoperatively (5 mares) and standing abdominal lavage performed (3 mares). Four mares survived long term and subsequently became pregnant. Immediately after surgical repair, 1 mare was anesthetized for exploratory celiotomy and abdominal lavage but fractured her pelvis during recovery from anesthesia and was euthanatized. A 2nd mare was euthanatized after 72 h because of severe diffuse peritonitis; however, the repair was still intact. In standing mares, rectal tears can be exteriorized by prolapse through the anal sphincter after sphincterotomy and repaired in 2 layers with staples oversewn with a continuous suture pattern. Rectal tears occurring as a result of parturition can potentially be repaired efficiently using an oversewn stapled primary closure technique.
    Veterinary Surgery 07/2008; 37(4):345-9. DOI:10.1111/j.1532-950X.2008.00387.x · 1.04 Impact Factor
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    ABSTRACT: Olecranon fracture is a common orthopedic problem in juvenile horses. Prognosis for complete fracture healing when various methods of internal fixation are used is good; however, the impact of olecranon fracture stabilization on the likelihood that foals will start on a racecourse is unknown. Medical records of foals undergoing internal fixation for an olecranon fracture were reviewed. The dam's foaling records were obtained and lifetime racing records were then retrieved for both the affected foals and 1 of their siblings. Twenty-two of 24 repaired fractures healed completely, subsequently, 16 of the foals started in at least 1 race. Statistical calculations suggest that when compared with their siblings, the occurrence of olecranon factures requiring internal fixation in juvenile racehorses will not significantly reduce the likelihood that they will race; however, the siblings had significantly more lifetime race starts and higher career earnings.
    The Canadian veterinary journal. La revue veterinaire canadienne 04/2006; 47(3):241-5. · 0.52 Impact Factor
  • Stefan Witte · Dwayne H Rodgerson ·

    Journal of the American Veterinary Medical Association 09/2005; 227(4):551-2. DOI:10.2460/javma.2005.227.551 · 1.56 Impact Factor
  • Stefan Witte · Paul E Thorpe · Robert J Hunt · Micheal A Spirito · Dwayne H Rodgerson ·
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    ABSTRACT: A lag-screw technique for transphyseal bridging of the medial aspect of the distal tibial physis in foals with tarsal valgus deformities and results of the technique in 11 foals (6 with bilateral tarsal valgus deformities and 5 with unilateral tarsal valgus deformities) are described. Briefly, horses were anesthetized, and a single stab incision was made through the skin to the underlying bone over the most distal aspect of the medial malleolus. A 20-gauge needle was placed in the incision to guide screw placement, and a lag screw was inserted parallel to the medial cortex of the tibia under radiographic guidance. Screws were removed when the tarsal valgus deformity was clinically assessed to have improved by at least 80%. Clinically, all horses had evidence of a tarsal valgus deformity of > 7 degrees prior to surgery. Mean age at the time of lag-screw implanation was 220 days (range, 116 to 364 days). Mean time the implant was in place was 62 days (range, 39 to 89 days). The tarsal valgus deformity resolved in all 11 horses with excellent cosmetic results.
    Journal of the American Veterinary Medical Association 11/2004; 225(10):1581-3, 1548. DOI:10.2460/javma.2004.225.1581 · 1.56 Impact Factor
  • John C Janicek · Dwayne H Rodgerson · Bryan L Boone ·
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    ABSTRACT: A 20-year-old Thoroughbred mare was evaluated because of a 2-year history of infertility. The mare had normal estrous cycles and had been bred 7 times by different stallions. Ultrasonographic examination revealed a homogeneous hyperechoic intramural mass in the tip of the right uterine horn; the mass was also detected via hysteroscopy Unilateral ovariectomy and partial hysterectomy were performed by use of a hand-assisted laparoscopic technique. Leiomyoma was diagnosed via histologic examination of the mass. Unilateral ovariectomy and partial hysterectomy are recommended in mares with leiomyoma in a uterine horn, especially if the tumor is associated with infertility. The hand-assisted laparoscopic technique allows direct visualization of abdominal structures and accurate placement of ligatures without applying tension on the broad ligament, and eliminates the risks and costs of general anesthesia.
    Journal of the American Veterinary Medical Association 10/2004; 225(6):911-4, 880. DOI:10.2460/javma.2004.225.911 · 1.56 Impact Factor
  • Curry G Keoughan · Dwayne H Rodgerson · Murray P Brown ·
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    ABSTRACT: To describe a hand-assisted, laparoscopic technique to remove the left kidney in standing horses. Prospective evaluation. Eight horses. Food was withheld for a minimum of 12 hours. Horses were sedated with detomidine hydrochloride (0.01-0.02 mg/kg, intravenously) and restrained in standing stocks. The left paralumbar fossa was prepared for surgery, and the surgical site was infiltrated with 2% mepivacaine. Hand-assisted, laparoscopic removal of the left kidney was performed through an incision in the center of the paralumbar fossa; the surgeon's hand was used to isolate the left kidney and associated vasculature. The renal artery and vein were isolated and individually ligated. After vessel transection distal to the ligatures, the left kidney was exteriorized, the ureter ligated and transected, and the incision closed. Laparoscopic removal of the left kidney was successfully performed in all horses. Retroperitoneal infiltration of local anesthesia provided adequate anesthesia. Intraoperative hemorrhage occurred in 3 horses. Surgical duration (initial skin incision to transection of the left kidney) ranged from 20 to 90 minutes. In 2 horses, no signs of pain were noted for 48 hours postoperatively. Hand-assisted laparoscopic surgery can be used for removal of the left kidney in horses. Clinical Relevance-Hand-assisted laparoscopic nephrectomy can be safely performed in standing horses; however, care should be taken to identify accessory branches of the renal artery to limit potential complications with hemorrhage.
    Veterinary Surgery 05/2003; 32(3):206-12. DOI:10.1053/jvet.2003.50028 · 1.04 Impact Factor
  • Dawn A Loesch · Dwayne H Rodgerson · Gregory R Haines · Bruce C Watt ·
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    ABSTRACT: To report the postoperative outcome in horses undergoing jejunoileal anastomosis performed with a 2-layer simple continuous technique. Retrospective study. 7 horses. Information regarding signalment, clinical signs, findings at surgery, and postoperative complications was obtained from medical records of horses that underwent exploratory ventral midline celiotomy, small intestinal resection, and jejunoileal anastomosis to correct various small intestinal strangulating lesions. Follow-up information was obtained via telephone conversations with owners or trainers. Six males and 1 female of various breeds aged 10 months to 27 years and weighing 312 to 785 kg (686.4 to 1,727 lb) were included. The most common complications were mild to moderate tachycardia and mild to moderate signs of abdominal pain. Two horses developed incisional infections and soft, fluctuant swelling at the incision site following resolution of the infection. Follow-up time ranged from 7 to 17 months after surgery. Owners reported no further colic episodes and no diet change necessary following surgery. All horses had returned to their intended level of use. Advantages to the jejunoileal technique include maintaining the normal ileocecal valve and a postoperative recovery period similar to that described following other small intestinal anastomoses. Jejunoileal anastomosis is a viable alternative to ileal bypass. This technique appears to result in a postoperative complication rate similar to that reported following jejunojejunostomy procedures.
    Journal of the American Veterinary Medical Association 09/2002; 221(4):541-5. DOI:10.2460/javma.2002.221.541 · 1.56 Impact Factor
  • Dwayne H Rodgerson · Murray P Brown · Bruce C Watt · Curry G Keoughan · Monique Hanrath ·

    Journal of the American Veterinary Medical Association 06/2002; 220(10):1503-7, 1475. DOI:10.2460/javma.2002.220.1503 · 1.56 Impact Factor
  • Monique Hanrath · Dwayne H Rodgerson ·
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    ABSTRACT: To describe a technique for laparoscopic cryptorchidectomy in standing horses using electrosurgical instrumentation. Retrospective clinical study. Ten horses, 1 to 7 years of age, with unilaterally or bilaterally retained testes. Food was withheld for a minimum of 12 to 24 hours. Horses were sedated using xylazine hydrochloride (0.5 to 1 mg/kg) and butorphanol tartrate (0.02 mg/kg) or detomidine hydrochloride (0.02 to 0.03 mg/kg) and restrained in standing stocks. Three portal sites in the paralumbar fossae were locally desensitized using 2% mepivacaine. After trocar and laparoscope insertion, the ipsilateral testicle, mesorchium, and ductus deferens were identified. The cranial mesorchium was coagulated with either monopolar (one horse) or bipolar (nine horses) electrosurgical forceps, and then the mesorchium, ductus deferens, and ligament of the tail of the epididymis were transected from cranial to caudal using laparoscopic scissors. Once the testis was freed, the transected mesorchium was inspected for hemorrhage and the testis was removed by connecting the two instrument portals (eight horses). In two horses, the testis was placed within a laparoscopic retrieval bag and then removed without enlarging the portal incision. If the testes were retained bilaterally, the retained contralateral testis was removed similarly through the opposite paralumbar fossa. If the contralateral testis was descended, it was removed by a standard, standing castration technique. Vessels of the mesorchium were adequately coagulated using bipolar and monopolar electrosurgical forceps. No immediate or short-term complications occurred in 10 horses at 3 to 11 months after surgery. Standing laparoscopic cryptorchidectomy can be performed easily and safely using electrosurgical instrumentation as the sole means of providing hemostasis of the equine mesorchium. Standing laparoscopic cryptorchidectomy using electrosurgical instrumentation provides a safe, reliable, and efficient alternative to achieve hemostasis of the equine mesorchium.
    Veterinary Surgery 03/2002; 31(2):117-24. DOI:10.1053/jvet.31049 · 1.04 Impact Factor
  • D H Rodgerson · J K Belknap · J N Moore · G L Fontaine ·
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    ABSTRACT: To determine messenger RNA expression of cyclooxygenase (COX)-2, tumor necrosis factor (TNF)-alpha, and interleukin- (IL)-1beta from cultured equine smooth muscle cells (SMC). Segments of palmar digital artery harvested from 6 clinically normal adult horses. Explants were collected from the tunica media of arteries for primary culture of SMC. Equine mononuclear cells were used as control cells. Subcultured vascular SMC and control cells were exposed to lipopolysaccharide (20 microg/ml and 100 ng/ml, respectively). Northern blot analysis with equine-specific probes for COX-2, TNF-alpha, and IL-1beta was performed, using isolated total cellular RNA. Although no message was detected for IL-1beta or TNF-alpha in control or endotoxin-exposed equine vascular SMC from all horses, COX-2 underwent a distinct substantial up-regulation after endotoxin exposure. Endotoxin-exposed equine mononuclear cells had up-regulation of IL-1beta and TNF-alpha mRNA. Increased expression of COX-2 mRNA by equine vascular SMC may be an important early pathophysiologic event in the onset of endotoxemia in horses. Potentiated local vascular production of various prostanoids after increased expression of mRNA for COX-2 may result in vasoactive events observed with laminitis.
    American Journal of Veterinary Research 01/2002; 62(12):1957-63. · 1.34 Impact Factor
  • Dwayne H. Rodgerson · James K. Belknap · James N. Moore · Genevieve L. Fontaine ·

    American Journal of Veterinary Research 12/2001; 62(12):1957-1963. DOI:10.2460/ajvr.2001.62.1957 · 1.34 Impact Factor

Publication Stats

340 Citations
32.34 Total Impact Points


  • 2015
    • Texas A&M University
      • Department of Large Animal Clinical Sciences
      College Station, Texas, United States
  • 2005-2014
    • Lexington Equine Surgery and Sports Medicine
      Lexington, Kentucky, United States
  • 2010
    • University of Florida
      • Department of Large Animal Clinical Sciences
      Gainesville, Florida, United States
  • 2001
    • University of Missouri
      • College of Veterinary Medicine
      Columbia, Missouri, United States
  • 1997-2001
    • Auburn University
      • College of Veterinary Medicine
      AUO, Alabama, United States