Jason L. Koh, M.D.

Jason L. Koh, M.D.

Jason L. Koh, M.D.

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Conditions & Procedures


Elbow Injury, Hip Injury, Knee Injury, Shoulder Injury, Sports Medicine


Cartilage Transplantation

General Information




NorthShore Medical Group


Shoulder & Knee Injuries, Hip Arthroscopy, Sports Medicine

Academic Rank

Clinical Associate Professor



Board Certified

Orthopaedic Surgery, Sports Medicine

Clinical Service

Sports Medicine

Education, Training & Fellowships

Medical School

Johns Hopkins University Schl of Med, 1994


Harvard Medical School - Massachusetts General Hospital, 1995


New York Presbyterian/Weill Cornell Med Ctr, 1999


Cleveland Clinic Foundation, 2000



NorthShore Medical Group

9650 Gross Point Rd.
Suite 2900
Skokie, IL 60076
847.866.7846 224.251.2905 fax This location is wheelchair accessible.

NorthShore Medical Group

2150 Pfingsten Rd.
Suite 3000
Glenview, IL 60026
847.866.7846 224.251.2905 fax This location is wheelchair accessible.


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  • Improving Residency Training in Arthroscopic Knee Surgery with Use of a Virtual-Reality Simulator: A Randomized Blinded Study.

    The Journal of bone and joint surgery. American volume 2014 Nov 5

    Authors: Cannon WD,
    There is a paucity of articles in the surgical literature demonstrating transfer validity (transfer of training). The purpose of this study was to assess whether skills learned on the ArthroSim virtual-reality arthroscopic knee simulator transferred to greater skill levels in the operating room.
    Postgraduate year-3 orthopaedic residents were randomized into simulator-trained and control groups at seven academic institutions. The experimental group trained on the simulator, performing a knee diagnostic arthroscopy procedure to a predetermined proficiency level based on the average proficiency of five community-based orthopaedic surgeons performing the same procedure on the simulator. The residents in the control group continued their institution-specific orthopaedic education and training. Both groups then performed a diagnostic knee arthroscopy procedure on a live patient. Video recordings of the arthroscopic surgery were analyzed by five pairs of expert arthroscopic surgeons blinded to the identity of the residents. A proprietary global rating scale and a procedural checklist, which included visualization and probing scales, were used for rating.
    Forty-eight (89%) of the fifty-four postgraduate year-3 residents from seven academic institutions completed the study. The simulator-trained group averaged eleven hours of training on the simulator to reach proficiency. The simulator-trained group performed significantly better when rated according to our procedural checklist (p = 0.031), including probing skills (p = 0.016) but not visualization skills (p = 0.34), compared with the control group. The procedural checklist weighted probing skills double the weight of visualization skills. The global rating scale failed to reach significance (p = 0.061) because of one extreme outlier. The duration of the procedure was not significant. This lack of a significant difference seemed to be related to the fact that residents in the control group were less thorough, which shortened their time to completion of the arthroscopic procedure.
    We have demonstrated transfer validity (transfer of training) that residents trained to proficiency on a high-fidelity realistic virtual-reality arthroscopic knee simulator showed a greater skill level in the operating room compared with the control group.
    We believe that the results of our study will stimulate residency program directors to incorporate surgical simulation into the core curriculum of their residency programs.
    PMID: 25378507 [PubMed - as supplied by publisher]
  • Computer-assisted Anterior Cruciate Ligament (ACL) Reconstruction: The US Perspective.

    Sports medicine and arthroscopy review 2014 Dec

    Authors: Koh J,
    Computer-assisted anterior cruciate ligament (ACL) reconstruction in the United States has been used to help improve clinical outcomes and investigate tunnel placement and kinematic activity. Computer-assisted techniques were developed to improve accuracy of tunnel placement, because of concerns about the accuracy of manual tunnel placement causing revisions. Several authors have demonstrated improved tunnel location with computer assistance, although others have demonstrated little or no difference. More recently, American investigators have used computer assistance to evaluate the position and biomechanical behavior and kinematics of theoretical tunnel placement and also to assess in vitro and in vivo knee stability following ligament reconstruction. Computer assistance of anterior ligament reconstruction has demonstrated its value as a research and clinical tool in the United States.
    PMID: 25370875 [PubMed - as supplied by publisher]
  • Comparison of Perioperative Complications and Hospitalization Outcomes After Ankle Arthrodesis Versus Total Ankle Arthroplasty From 2002 to 2011.

    Foot & ankle international 2014 Oct 30

    Authors: Jiang JJ,
    The aim of this study was to analyze a validated, nationally representative admissions database in order to compare perioperative complications and hospitalization outcomes associated with ankle arthrodesis (AAD) versus ankle arthroplasty (TAA).
    Using the Nationwide Inpatient Sample (NIS) database from 2002 to 2011, 12 250 patients who underwent AAD and 3002 patients who underwent TAA were identified based on International Classification of Diseases, Ninth Revision (ICD-9) codes. The demographics, comorbidities, and perioperative outcomes during the index hospital stay were compared between patients who underwent AAD and TAA. Multivariate analysis was performed to adjust for differences in demographics and comorbidities between the 2 groups.
    Multivariate analysis demonstrated that TAA was independently associated with a decreased risk of blood transfusion (relative risk [RR] = 0.53, P < .001), non-home discharge (RR = 0.70, P < .001), and overall complication (RR = 0.79, P = .03). There were similar rates of pneumonia, deep vein thrombosis, pulmonary embolus, cerebrovascular accident, myocardial infarction, and mortality. TAA was independently associated with a significantly higher hospital charge (difference = $24 431, P < .001). There was no significant difference in the adjusted length of stay between the 2 groups (P = .13).
    TAA was independently associated with a lower risk of blood transfusion, non-home discharge, and overall complication when compared to AAD during the index hospitalization period. TAA was also independently associated with a higher hospitalization charge, but length of stay was similar between the 2 groups. Until long-term comparative studies are performed, the optimal treatment for end-stage ankle arthritis remains controversial, this study provides greater clarity with regard to hospitalization outcomes after the 2 procedures and shows no significant difference in risk for the majority of medical perioperative complications.
    Level III, comparative series.
    PMID: 25358807 [PubMed - as supplied by publisher]
  • Number of Recent Inpatient Admissions as a Risk Factor for Increased Complications, length-of-stay, and Cost in Patients Undergoing Posterior Lumbar Fusion.

    Spine 2014 Sep 29

    Authors: Eleswarapu A,
    Study Design. Retrospective cohort studyObjective. To identify risk factors for increased complication rate, hospital charges, and length-of-stay in patients undergoing posterior lumbar fusion.Summary of Background Data. A better understanding of risk factors for perioperative complications in patients undergoing posterior lumbar fusion can aid with patient selection and postoperative monitoring. Previous studies have assessed the impact of factors such as body mass index, age, and ASA class on complication rate.Methods. Data was acquired from the institution's quality improvement dataset. Preoperative demographic factors included gender, age, number of inpatient admissions in the prior year, body mass index, Charlson comorbidity score, ASA class, number of levels fused, operative duration, and medications on admission. Complications recorded included pneumonia, myocardial infarction, venous thromboembolic event, hardware failure, readmission, or unplanned return to the OR. Multivariate regression was used to identify predictors of increased complication rate, hospital charges, and length-of-stay.Results. 462 patients were included. A history of more than one admission in the prior year was the only variable significantly associated with increased complication rate (odds ratio 10.56, p < .0001). History of more than one admission in the prior year (+1.92 days, p < .0001), operative duration >5 hours (+0.81 days, p = .008), and ASA class 3 or greater (+0.75 days, p = .01) were associated with increased length of stay, while history of more than one admission in the prior year (+$27,798, p < .0001), fusion of four or more levels (+$38,043, p < .0001), and operative duration >5 hours (+$40,298, p <.0001) were associated with increased total charges.Conclusions. The number of inpatient admissions in the prior year was found to be a more powerful predictor of perioperative risk following lumbar fusion than metrics evaluated in prior studies, such as age, BMI, and comorbidities.
    PMID: 25271515 [PubMed - as supplied by publisher]
  • Comparison of perioperative complications after total elbow arthroplasty in patients with and without diabetes.

    Journal of shoulder and elbow surgery / American Shoulder and Elbow Surgeons ... [et al.] 2014 Nov

    Authors: Toor AS,
    Few studies have analyzed the effect of diabetes on outcomes after total elbow arthroplasty (TEA). We investigated the perioperative complications after TEA in patients with and without diabetes.
    We evaluated the Nationwide Inpatient Sample (NIS) database from 2005 to 2010 for patients who underwent a TEA. Our retrospective study included 3184 patients based on International Classification of Diseases-Ninth Revision, Clinical Modification codes. We compared outcomes in 488 patients with diabetes and in 2696 patients without diabetes.
    Patients with diabetes had a significantly older mean age (66.8 vs 58.5 years, P < .001). There was no statistically significant difference when comparing length of stay (4.1 vs 3.7 days, P = .056) and cost of surgery ($56,582 vs $56,092, P = .833). A significantly higher percentage of diabetic patients underwent TEA for the indication of fracture (73.4% vs 65.3%), but a lower percentage for rheumatoid arthritis (10.2% vs 19.2%). They also had significantly increased rates of pneumonia (odds ratio [OR], 2.7), urinary tract infection (OR, 2.2), blood transfusion (OR, 2.1), and nonroutine discharge (OR, 1.9). After adjusting for significantly increased rates of comorbidities in diabetic patients, our multivariate analysis showed that having diabetes was independently associated with an increased risk of pneumonia (relative risk [RR], 2.6), urinary tract infection (RR, 1.9), and cerebrovascular accident (RR, 9.1). However, diabetes was not independently associated with hospital length of stay (P = .75), after correction, hospital cost (P = .63), or proportion of routine discharges (P = .12).
    Patients with diabetes have higher rates of comorbidities and perioperative complications after TEA.
    PMID: 25213826 [PubMed - as supplied by publisher]
  • Analysis of perioperative complications in patients after total shoulder arthroplasty and reverse total shoulder arthroplasty.

    Journal of shoulder and elbow surgery / American Shoulder and Elbow Surgeons ... [et al.] 2014 Aug 23

    Authors: Jiang JJ,
    Data directly comparing the perioperative complication rates between total shoulder arthroplasty (TSA) and reverse total shoulder arthroplasty (RTSA) are limited.
    The Nationwide Inpatient Sample database, which comprises data from a statistically representative sample of hospitals across the United States, was analyzed for the years 2010 and 2011. The International Classification of Diseases, Ninth Revision procedure codes differentiated the patients who received TSA (81.80) and RTSA (81.88). Demographic data, comorbidities, perioperative complications, and hospitalization data were compared.
    This retrospective analysis included 19,497 patients, with 14,031 patients in the TSA group and 5466 patients in the RTSA group. Patients who underwent RTSA were older (P < .001), were more likely to be female (P < .001), and had increased rates of fracture (P < .001). The RTSA group had significantly higher perioperative rates of mortality (P = .004), pneumonia (P < .001), deep venous thrombosis (P < .001), myocardial infarction (P = .005), urinary tract infection (P < .001), and blood transfusions (P < .001). In addition, the RTSA patients had longer hospital stays (P < .001) and higher hospital charges (P < .001). The rates of comorbidities were also higher in the patients who underwent RTSA. After adjustment for these differences in comorbidities and surgical indications with our multivariate analysis, RTSA was still independently associated with increased hospital charges (difference of $11,530; P < .001), longer hospitalization (difference of 0.24 day; P < .001), more blood transfusions (relative risk, 1.43; P < .001) and higher rates of pneumonia (relative risk, 1.61; P = .04) and deep venous thrombosis (relative risk, 2.24; P = .01).
    We found that RTSA patients, compared with TSA patients, had significantly longer length of stay, higher hospital charges that are not completely attributable to increased implant costs alone, and increased rates of perioperative complications.
    PMID: 25156959 [PubMed - as supplied by publisher]
  • Patellar instability.

    Clinics in sports medicine 2014 Jul

    Authors: Koh JL,
    Patella instability can cause significant pain and functional limitations. Several factors can predispose to patella instability, such as ligamentous laxity, increased anterior TT-TG distance, patella alta, and trochlear dysplasia. Acquired factors include MPFL injury or abnormal quadriceps function. In many cases, first-time dislocation can successfully be managed with physical therapy and other nonoperative management; however, more than one dislocation significantly increases the chance of recurrence. Surgical management can improve stability, but should be tailored to the injuries and anatomic risk factors for recurrent dislocation. Isolated lateral release is not supported by current literature and increases the risk of iatrogenic medial instability. Medial repair is usually reserved for patients with largely normal anatomy. MPFL reconstruction can successfully stabilize patients with medial soft tissue injury but is a technically demanding procedure with a high complication rate and risks of pain and arthrosis. Tibial tubercle osteotomy can address bony malalignment and also unload certain articular cartilage lesions while improving stability. Trochleoplasty may be indicated in individuals with a severely dysplastic trochlea that cannot otherwise be stabilized. A combination of procedures may be necessary to fully address the multiple factors involved in causing pain, loss of function, and risk of recurrence in patients with patellar instability.
    PMID: 24993410 [PubMed - as supplied by publisher]
  • Neer Award 2012: cerebral oxygenation in the beach chair position: a prospective study on the effect of general anesthesia compared with regional anesthesia and sedation.

    Journal of shoulder and elbow surgery / American Shoulder and Elbow Surgeons ... [et al.] 2013 Oct

    Authors: Koh JL,
    Devastating neurologic ischemic episodes, such as stroke and deafness, have occurred in patients undergoing shoulder surgery in the beach chair position. We hypothesized that awake patients would be able to avoid significant cerebral deoxygenation events (CDEs) compared with anesthetized patients when procedures were performed in the beach chair position.
    Sixty patients underwent elective shoulder surgery in the beach chair position. Thirty patients underwent an interscalene block and monitored sedation (awake group); 30 patients underwent general anesthesia (asleep group). Cerebral oxygenation saturation (Scto2) was measured during the procedure. Scto2 values below critical thresholds were defined as CDEs and treated.
    Baseline mean arterial pressure and Scto2 values were lower in the asleep group during the operation (P < .0001). A higher incidence of CDEs was seen in the asleep group (56.7% vs 0% awake group), and more CDEs were seen per patient (2.97 in asleep vs 0 awake, P < .0001). Scto2 below a threshold value of 55% was seen in 23.3% in the asleep group vs 3.3% in the awake group. A total of 89 combined desaturation events were documented in the asleep vs 1 in the awake group (P < .0001).
    Patients in the beach chair position treated with regional anesthesia and sedation had almost no cerebral desaturation events, unlike patients who had general anesthesia. Avoidance of general anesthesia in the beach chair position may reduce the risk of ischemic neurologic injury.
    PMID: 23571083 [PubMed - as supplied by publisher]
  • Arthroscopic treatment of hip pain.

    Disease-a-month : DM 2012 Sep

    PMID: 22898379 [PubMed - as supplied by publisher]

In the News

Jun 2014

May 2014

Dec 2013

Oct 2013

Jul 2013

Nov 2012

Featured Videos

Dr. Jason Koh,  Chairman of the Department of Orthopaedic Surgery and Director of the NorthShore Orthopaedic Institute, speaks about the collaborative care offered by the Department of Orthopaedic Surgery.

Dr. Jason Koh, Chairman of the Department of Orthopaedic Surgery and Director of the NorthShore Orthopaedic Institute, speaks about the collaborative care offered by the Department of Orthopaedic Surgery.

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