STEPHEN TKACH, M.D.

OKLAHOMA CITY, OK

Research Active
Orthopaedic Surgery NPI registered 21+ years 12 publications 1969 – 2025 NPI: 1700884087
Blood Loss, SurgicalPostoperative ComplicationsMagnetic Resonance ImagingGastrointestinal MicrobiomeAccidents, TrafficLigaments, ArticularFecesIrritable Bowel SyndromeArthroplasty, Replacement, AnkleFecal Microbiota TransplantationPedestriansKnee InjuriesMultiple TraumaAntifibrinolytic AgentsTranexamic Acid

Practice Location

3056 BRUSH CREEK RD
OKLAHOMA CITY, OK 73120-1856

Phone: (405) 751-3515

What does STEPHEN TKACH research?

Dr. Tkach studies how certain diseases and their treatments affect patients' well-being. He particularly focuses on conditions like cervical spondylitis, which can cause neck pain, and ulcerative colitis, a digestive disease that leads to inflammation in the intestines. He investigates how new treatments, such as fecal microbiota transplantation (FMT), can improve symptoms for patients with mild-to-moderate ulcerative colitis and post-infectious irritable bowel syndrome (PI-IBS). Additionally, his research explores surgical outcomes in patients having spine surgery and ankle replacements, aiming to better understand recovery factors.

Key findings

  • In his study on cervical spondylitis, a higher comorbidity score (7 or more on the Charlson scale) was linked to a greater risk of complications post-surgery.
  • In the trial for ulcerative colitis, 84.6% of patients receiving fecal microbiota transplantation achieved remission after 8 weeks compared to 70.4% on standard treatment.
  • Patients with post-infectious irritable bowel syndrome reported significant symptom improvement within two weeks of receiving fecal microbiota transplantation.
  • His research on tranexamic acid found no significant differences in blood loss or wound complications in total ankle surgeries, suggesting the need for different strategies in surgical care.
  • His investigation into ligament injuries showed that 12.4% of patients involved in pedestrian accidents had ligament injuries, often leading to serious complications.

Frequently asked questions

Does Dr. Tkach study ulcerative colitis?
Yes, Dr. Tkach researches treatments for mild-to-moderate ulcerative colitis, specifically focusing on fecal microbiota transplantation.
What is fecal microbiota transplantation?
Fecal microbiota transplantation (FMT) is a treatment that involves transferring healthy bacteria from a donor's stool to a patient's gut to improve gut health.
Is Dr. Tkach's work relevant to patients with knee injuries?
Yes, he has researched ligament injuries in individuals who have been involved in pedestrian accidents, providing insights into treatment and recovery.

Publications in plain English

Sagittal Parameters and Clinical Outcomes in Cervical Spondylitis: The Cohort Analysis.

2025

Diseases (Basel, Switzerland)

Naumov D, Tkach S, Linkova N, Medvedev D, Krasichkov A +4 more

Plain English
This study looked at how the alignment of the spine (sagittal parameters) affects patient outcomes after surgery for cervical spondylitis, a condition that can lead to neck pain and instability. Researchers analyzed data from 59 patients who had spine surgery and found that factors like age and existing health problems significantly influence recovery and complications. Specifically, a higher comorbidity score (7 or more on the Charlson scale) predicts a greater risk of complications after surgery. Who this helps: This information helps patients with cervical spondylitis and their doctors make better decisions about treatment and manage expectations for recovery.

PubMed

Current Status and Future Therapeutic Options for Fecal Microbiota Transplantation.

2022

Medicina (Kaunas, Lithuania)

Tkach S, Dorofeyev A, Kuzenko I, Boyko N, Falalyeyeva T +4 more

Plain English
This research paper explores how changing the bacteria in our intestines can impact our health, particularly in relation to gut and other diseases. It focuses on fecal microbiota transplantation (FMT), a treatment where doctors replace the unhealthy bacteria in a patient's gut with healthy bacteria from a donor. The study highlights that FMT has shown promise in treating conditions like ulcerative colitis and other diseases, but its full potential is still being investigated. Who this helps: This benefits patients suffering from gastrointestinal diseases and other related health issues.

PubMed

Fecal microbiota transplantation in patients with post-infectious irritable bowel syndrome: A randomized, clinical trial.

2022

Frontiers in medicine

Tkach S, Dorofeyev A, Kuzenko I, Sulaieva O, Falalyeyeva T +1 more

Plain English
This study looked at the effects of fecal microbiota transplantation (FMT) on patients suffering from post-infectious irritable bowel syndrome (PI-IBS). It found that patients who received FMT experienced significant improvements in their abdominal symptoms within two weeks, and their quality of life increased notably after three months. The results showed that FMT was safer and more effective than standard treatments. Who this helps: This helps patients with post-infectious irritable bowel syndrome.

PubMed

Efficacy and safety of fecal microbiota transplantationcolonoscopy as add-on therapy in patients with mild-to-moderate ulcerative colitis: A randomized clinical trial.

2022

Frontiers in medicine

Tkach S, Dorofeyev A, Kuzenko I, Falalyeyeva T, Tsyryuk O +4 more

Plain English
This study looked at how effective and safe fecal microbiota transplantation (FMT) is when added to the standard treatment for patients with mild-to-moderate ulcerative colitis (UC). After 8 weeks, 84.6% of patients receiving FMT achieved remission compared to 70.4% of those on standard care. The results also showed a more significant improvement in symptoms and bowel health in the FMT group, indicating that this treatment option could be beneficial for patients. Who this helps: This helps patients with mild-to-moderate ulcerative colitis.

PubMed

Sustainable Oxidation of Cyclohexane and Toluene in the Presence of Affordable Catalysts: Impact of the Tandem of Promoter/Oxidant on Process Efficiency.

2020

ACS omega

Pokutsa A, Tkach S, Zaborovsky A, Bloniarz P, Paczeŝniak T +1 more

Plain English
This study looked at how to effectively oxidize cyclohexane and toluene using affordable catalysts at temperatures between 40-100 degrees Celsius and pressures of 1-10 atm. Researchers found that adding small amounts of oxalic acid or hydroxyphthalimide can boost the efficiency of the oxidation process by 30 times. This matters because it offers a more sustainable and cost-effective way to produce important chemicals from these compounds. Who this helps: This benefits chemical engineers and companies working on greener manufacturing processes.

PubMed

Prevalence of ligamentous knee injuries in pedestrian versus motor vehicle accidents.

2020

BMC musculoskeletal disorders

Steinmetz RG, McDonald M, Tkach S, Hamilton J, Heigle G +3 more

Plain English
This study looked at knee injuries in adults who were hit by vehicles, focusing on how common ligament injuries were compared to other injuries. Out of 539 patients, 67 (about 12.4%) had 84 ligament injuries, and most of those injuries affected multiple ligaments. Those with ligament injuries often faced serious complications and spent more time in the hospital than those without these injuries, highlighting the need for thorough evaluation and imaging when such injuries are suspected. Who this helps: This helps patients who are involved in pedestrian accidents and the doctors treating them.

PubMed

Effect of Tranexamic Acid on Wound Complications and Blood Loss in Total Ankle Arthroplasty.

2020

Foot & ankle international

Steinmetz RG, Luick L, Tkach S, Falcon S, Stoner J +3 more

Plain English
This study looked at how well tranexamic acid (TXA) helps reduce blood loss and complications in patients undergoing total ankle replacement surgery. Researchers compared 119 patients, with 55 receiving TXA and the rest not, but found no significant differences in blood loss, hemoglobin levels, or wound complications between the two groups. This matters because TXA works well for knee and hip surgeries but did not show benefits for ankle surgeries, implying that different strategies may be needed for different types of surgeries. Who this helps: This helps doctors and patients considering total ankle replacements.

PubMed

Investigation of cardiac fibroblasts using myocardial slices.

2018

Cardiovascular research

Perbellini F, Watson SA, Scigliano M, Alayoubi S, Tkach S +11 more

Plain English
This study looked at heart cells called cardiac fibroblasts (CFs) using small slices of heart tissue from mice, dogs, and humans. The researchers found that when the heart slices were unloaded, the CFs grew without showing a typical marker called α-SMA for up to 7 days. They also discovered that applying specific mechanical stress to the heart slices significantly reduced CF growth. This research is important because it helps us understand how CFs behave in their natural environment, which can lead to better treatments for heart conditions involving excessive fibrosis. Who this helps: This helps doctors and researchers working to treat heart disease.

PubMed

Association between body mass index and Firmicutes/Bacteroidetes ratio in an adult Ukrainian population.

2017

BMC microbiology

Koliada A, Syzenko G, Moseiko V, Budovska L, Puchkov K +8 more

Plain English
This study looked at the gut bacteria of 61 adults in Ukraine to see how it relates to their body weight. Researchers found that as people became more obese, the bacteria called Firmicutes increased, while another type called Bacteroidetes decreased. Specifically, the ratio of Firmicutes to Bacteroidetes was significantly higher in obese individuals, with odds increasing by 1.33 for every unit increase in body mass index (BMI). Who this helps: This research benefits doctors and dietitians working with obese patients.

PubMed

Health care industry trends: converting data to competitive advantage.

2007

Trustee : the journal for hospital governing boards

Kaufman K, Tkach S

Plain English
This paper looks at current trends in the health care industry and explores how companies can use data to improve their services and gain a competitive edge. The study highlights that businesses that effectively leverage data can see up to a 20% increase in patient satisfaction. Understanding these trends matters because it helps health care providers offer better care and improve their operations. Who this helps: This helps health care providers and administrators improve care for patients.

PubMed

Gouty arthritis of the spine.

1970

Clinical orthopaedics and related research

Tkach S

PubMed

Synovectomy of the knee in rheumatoid arthritis.

1969

Southern medical journal

Todd L, Tkach S

PubMed

Frequent Co-Authors

Andrii Dorofeyev Iurii Kuzenko Tetyana Falalyeyeva Nazarii Kobyliak Ludovico Abenavoli Luigi Boccuto R Garrett Steinmetz Kimberly Hollabaugh Denis Naumov Natalia Linkova

Physician data sourced from the NPPES NPI Registry . Publication data from PubMed . Plain-English summaries generated by AI. Not medical advice.