Jong-Hun Ji

Catholic University of Korea, Sŏul, Seoul, South Korea

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Publications (51)75.68 Total impact

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    ABSTRACT: Background: We studied combined effect of change in humeral neck shaft angle and retroversion on shoulder ROM in reverse total shoulder arthroplasty using 3-dimensional simulations. Methods: Using a 3D model construct based on the CT scans of 3 males and a 3-dimensional analysis program, a humeral component of reverse total shoulder arthroplasty was implanted in 0°, 10°, 20°, 30°,40° retroversion and 135°, 145°, and 155° neck shaft angle. Total horizontal range of motion (sum of horizontal adduction and abduction) at 30° and 60° scaption, adduction in the scapular plane and IR behind the back were measured for various combinations of neck shaft angle and retroversion. Findings: Change in retroversion didn't show any effect on total horizontal range of motion. Total horizontal range of motion at both 30° and 60° scaption, showed maximum values at 135° neck shaft angle and minimum values at 155° neck shaft angle. With any combination of retroversion angles, adduction deficit was maximum at 155° neck shaft angle and no adduction deficit at 135° neck shaft angle. Every 10° decrease in neck shaft angle resulted in an average 10.4° increase in adduction. For every 10° increase in retroversion, there was loss of internal rotation behind the back up to at least one vertebral level. Interpretation: 135° neck shaft angle resulted in maximum total horizontal range of motion both at 30° and 60° scaption regardless of retroversion angles. 135° neck shaft angle also reduced the chances of scapular impingement. Decrease in retroversion angle resulted in more amount of internal rotation behind the back.
    Clinical biomechanics (Bristol, Avon) 10/2015; DOI:10.1016/j.clinbiomech.2015.06.022 · 1.97 Impact Factor
  • Se-Won Lee · Sang-Eun Park · Min-Gyu Park · Jong-Hun Ji ·

    09/2015; 18(3):159-161. DOI:10.5397/cise.2015.18.3.159
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    ABSTRACT: Purpose: The purpose of the present study was to describe the use of a novel hybrid surgical technique-arthroscopic-assisted plate fixation-and evaluate its clinical and anatomical outcomes in the management of large, displaced greater tuberosity (GT) fractures with comminution. Methods: From 2009 to 2011, this novel technique was performed in 11 patients [2 men and 9 women; median age, 64 years (range 41-83 years)] with large, comminuted GT fractures, with fragment displacements of >5 mm. The preoperative mean posterior and superior migration of the fractured fragment, as measured on computed tomography (CT), was 19.5 and 5.5 mm, respectively. Two patients had shoulder fracture-dislocation, and three had associated undisplaced surgical neck fracture. The mean duration between injury and surgery was 4 days. The mean follow-up duration was 26 months. Results: At the final follow-up, the mean postoperative ASES, UCLA and SST scores were 84, 29, and 8, respectively. The mean range of motion was as follows: forward flexion, 138°; abduction, 135°; external rotation at the side, 19°; and internal rotation, up to the L2 level. The mean posterior and superior displacements of fracture fragments on postoperative CT scan [0.7 ± 0.8 mm (range 0-2.1 mm) and 2.8 ± 0.5 mm (range 3.4-5.3 mm), respectively] were significantly improved (p < 0.05). On arthroscopy, a partial articular-side supraspinatus tendon avulsion lesion was identified in 10 of 11 patients (91 %), and 1 of these patients had a partial tear of the biceps and 1 had a partial subscapularis tear, respectively (9 %). Intraoperatively, 1 anchor pullout and 1 anchor protrusion through the humeral head were noted and corrected. Postoperatively, the loss of reduction in the fracture fragment was noted in 1 patient at 4 weeks, after corrective reduction and fixation surgery. Conclusions: The novel arthroscopic-assisted anatomical plate fixation technique was found to be effective in reducing large-sized, displaced, comminuted GT fractures and in allowing concurrent management of intra-articular pathologies and early functional rehabilitation. Compared with the conventional plate fixation or arthroscopic suture anchor fixation technique, arthroscopic-assisted plate fixation enabled accurate restoration of the medial footprint of the GT fracture and provided an effective buttress to the large-sized GT fracture fragments. Level of evidence: Retrospective clinical study, Level IV.
    Knee Surgery Sports Traumatology Arthroscopy 09/2015; DOI:10.1007/s00167-015-3805-3 · 3.05 Impact Factor
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    ABSTRACT: To evaluate the clinical and radiological outcomes of unstable proximal humeral fractures (PHFs) treated with a locking plate and fibular strut allograft. This study included 36 patients [7 men, 29 women; mean age, 68 years (range, 22-94 years)] with unstable PHFs with medial column disruption. All patients were treated with open reduction and internal fixation using a locking plate and fibular strut allograft. Post-operative assessment included clinical outcomes, shoulder range of motion, radiographic examination, and any complications. Post-operative radiological assessment including the humerus neck-shaft angle (NSA) and the humeral head height was performed. At the mean two year follow-up visit, the mean American Shoulder and Elbow Society (ASES) and University of California, Los Angeles (UCLA) scores were 77 and 28, respectively. According to the UCLA rating scale, the result was excellent in six, good in 20, fair in six, and poor in four cases. According to the Paavolainen method, 31 patients had good results with an NSA of 130 ± 10°; three patients showed fair results with an NSA of 100-120°, and two patients experienced a poor result with an NSA of <100°. When calculating the humeral head height, the mean loss of reduction was measured as 1.6 mm (from 10.8 or 9.2 mm). Varus collapse and avascular necrosis of the humeral head was noted in two patients for each condition. For unstable proximal humerus fractures, particularly in elderly patients with severe osteoporosis or in younger patients with a four-part fracture, locking plate fixation with a fibular strut allograft provided rigid medial support and showed satisfactory clinical and radiological outcomes.
    International Orthopaedics 08/2015; DOI:10.1007/s00264-015-2950-0 · 2.11 Impact Factor
  • Jong-Hun Ji · Sang-Eun Park · Weon-Yoo Kim · Hyung-Ki Min · Se-Won Lee ·

    Journal of Orthopaedic Science 08/2015; DOI:10.1016/j.jos.2015.07.002 · 0.94 Impact Factor
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    ABSTRACT: The purpose of this study was to document the distribution of the articular branch of the lateral pectoral nerve (LPN) to the shoulder and to identify a suitable point for its blockade. This study involved the dissection of 43 shoulders of 22 unembalmed cadavers (6 male and 16 female) to identify the LPN and its articular branch to the shoulder. To identify the suitable anatomical point for blocking the articular branch of the LPN, several anatomical landmarks around the shoulder were measured. The articular branch of the LPN to the shoulder was present in 29 of 43 cases (67.4 %). The appropriate point to block the articular branch of the LPN was identified at a mean distance of 1.5 cm below the clavicle, on the line connecting the closest points between the clavicle and the coracoid process, and at a mean depth of 1.0 cm from the skin. The articular branch of the LPN to the shoulder, as well as the muscular and cutaneous branches of the LPN, covers a portion of the shoulder joint with suprascapular and axillary nerves. Surgeons might consider a peripheral block of the suprascapular, axillary, and LPNs to provide maximum block coverage after shoulder joint surgery.
    Knee Surgery Sports Traumatology Arthroscopy 07/2015; DOI:10.1007/s00167-015-3703-8 · 3.05 Impact Factor
  • Jong-Hun Ji · Mohamed Shafi · Jae-Jung Jeong · Ji-Yoon Ha ·

    Journal of Orthopaedic Science 06/2015; DOI:10.1016/j.jos.2015.06.004 · 0.94 Impact Factor
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    ABSTRACT: To analyze the clinical and radiologic outcomes of arthroscopic cyst decompression and labral repair in patients with inferior paralabral cysts with chronic shoulder pain. Between March 2006 and September 2012, 16 patients who were identified as having inferior paralabral cysts presented with chronic shoulder pain. All patients underwent a thorough physical examination and preoperative magnetic resonance arthrographic evaluation. The mean age was 30 years (range, 17 to 50 years). The mean follow-up period was 38 months (range, 16 to 60 months). Clinical outcome scores (American Shoulder and Elbow Surgeons; University of California, Los Angeles; and Simple Shoulder Test) and passive shoulder range of motion were evaluated at last follow-up. Follow-up magnetic resonance imaging was performed at a mean of 8 months to determine the labral healing status and assess for cyst recurrence. The incidence of isolated inferior paralabral cysts was 0.6% (16 of 2,656 cases). Of the patients, 8 had multiple cysts and 8 had a single cyst. The mean length and width of the cysts were 1.0 cm and 0.4 cm, respectively. Eight cases had a history of trauma, and 13 patients were involved in sports activities. Seventy-five percent of cases showed a positive relocation test. The mean American Shoulder and Elbow Surgeons; University of California, Los Angeles; and Simple Shoulder Test scores improved from 64, 22, and 8.7, respectively, preoperatively to 83, 31, and 10, respectively (P < .001), at final follow-up. Shoulder range of motion did not show any significant improvement. The location of the labral tear was as follows: anteroinferior tear in 5 cases, posteroinferior tear in 8 cases, and combined anteroinferior and posteroinferior tear in 3 cases. All cysts were found to be in association with a labral tear. A mean of 2.7 anchors were used for inferior labral repair. These cysts were found only in male patients. None of the patients showed any evidence of cyst recurrence on follow-up magnetic resonance imaging. Inferior labral tears treated with cyst decompression and labral repair showed satisfactory clinical results without any recurrence. Inferior paralabral cysts should be considered in the differential diagnosis in patients presenting with chronic shoulder pain, particularly active male patients. Level IV, therapeutic case series. Copyright © 2015 Arthroscopy Association of North America. Published by Elsevier Inc. All rights reserved.
    Arthroscopy The Journal of Arthroscopic and Related Surgery 03/2015; 31(6). DOI:10.1016/j.arthro.2015.01.008 · 3.21 Impact Factor
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    ABSTRACT: High tibial osteotomy (HTO) has been used to successfully treat patients with genu varus deformities that can improve mechanical function and condition in the knee joint. Clinical studies have reported that bow legs often occur with a concentrated load on the varus of the tibia. This study aimed to analyze and verify the clinical test data result by utilizing the three-dimensional (3D) static finite element method (FEM). The 3D model of lower extremities, which include the femur, tibia, meniscus, and knee articular cartilage, was created using the images from a computer tomography scan and magnetic resonance imaging. In this report, we compared changes in stress distribution and force reaction on the tibial plateau because of critical problems caused by unexpected changes in the tibial posterior-slope angle because of HTO. The results showed that the 5° wedge-angle virtual opening wedge HTO without and with the posterior-slope angle shows has a load concentration of approximately 60% and 45% in the medial region, respectively.
    Journal of Mechanical Science and Technology 03/2015; 29(3):1175-1179. DOI:10.1007/s12206-015-0229-4 · 0.84 Impact Factor
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    ABSTRACT: Intratendinous tears of the rotator cuff are rare, and little has been written about them.
    The American Journal of Sports Medicine 11/2014; 43(2). DOI:10.1177/0363546514556741 · 4.36 Impact Factor
  • Jong-Hun Ji · Jae-Jung Jeong · Karnav Panchal · Yong Park ·
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    ABSTRACT: Shoulder arthroscopy has become a common procedure in today's orthopedic practice. The safety of this procedure has been well established, but there are some complications associated with every surgical procedure both minor and major. In the present era, with advanced arthroscopic instruments, it is rare to encounter the problem of instrument breakage during arthroscopic surgery. Here, we report an unusual case in which we found a detached arthroscopic lens within the shoulder joint. A 58-year-old male patient who was previously operated for shoulder arthroscopy for the treatment of impingement syndrome combined with shoulder stiffness. We performed shoulder arthroscopy again and removed the detached lens arthroscopically. This case warrants the need for the surgeon and the operating room staff to be well acquainted with the arthroscopic instruments and to check the instruments properly before and after the completion of the procedure. If the operating room staff would have identified the damage to the scope, encountered during the primary operation, we could have avoided the second procedure to remove the lens.
    Archives of Orthopaedic and Trauma Surgery 05/2014; 134(8). DOI:10.1007/s00402-014-2011-y · 1.60 Impact Factor
  • Jong-Hun Ji · Mohamed Shafi · Dong-Seok Jeong ·
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    ABSTRACT: Synovial chondromatosis is classified as either primary or secondary. Primary synovial chondromatosis results from a proliferation of chondrocytes in the synovial membrane leading to the formation of cartilaginous loose bodies. Secondary synovial chondromatosis is a rare condition characterized by the growth of separated particles from the articular cartilage or osteophytes in joint diseases. The present article aims to report the secondary chondromatosis of the shoulder and to discuss the clinical manifestations, pathogenesis, diagnosis, histological findings and management of this condition. Level of evidence IV.
    Knee Surgery Sports Traumatology Arthroscopy 05/2014; 23(9). DOI:10.1007/s00167-014-3024-3 · 3.05 Impact Factor
  • Jae-Jung Jeong · Jong-Hun Ji · Mohamed Shafi · Jun-Ku Lee ·
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    ABSTRACT: Tumoral calcinosis is an uncommon disorder and characterized by development of calcified masses within the soft tissues near the large joints such as the hip, elbow, and shoulder and rarely occurs in the foot. We report a case of tumoral calcinosis at the first meta-tarso-phalangeal (MTP) joint of foot with hallux valgus deformity associated with bunion which required resection. Surgical excision of the calcific mass alone, without surgery to the minimal hallux valgus, resulted in resolution of symptoms, without recurrence of the lesion. Subsequently, speculative etiology, differential diagnostic considerations as well as the therapeutic interventions for tumoral calcinosis are discussed taking into consideration the current literature. We conclude that tumoral calcinosis should be considered in the differential diagnosis of a painful mass that develops in the small joints of the foot.
    Foot and Ankle Surgery 03/2014; 20(1):e15-e18. DOI:10.1016/j.fas.2013.10.007
  • Jong-Hun Ji · Mohamed Shafi · Sang-Eun Park · Po-Yeon Park ·
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    ABSTRACT: Fracture of the proximal humerus metaphysis with coexistent dislocation of the shoulder in children is a rare injury. The injury often occurs as a consequence of high velocity trauma. Most fractures of the proximal humerus commonly associated with the epiphysis in children can be treated with closed reduction. We presented a case of 5-year-old girl who sustained this type of fracture- dislocation of the shoulder. Open reduction and internal fixation with multiple smooth K-wires was performed. At two years follow-up, the patient was pain free and regained full range of motion.
    Chinese Journal of Traumatology (English Edition) 02/2014; 17(1):54-6. DOI:10.3760/cma.j.issn.1008-1275.2014.01.013
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    ABSTRACT: Arthroscopic removal, now the main treatment option, has almost replaced open surgery for treatment of resistant calcific tendinitis. In some cases of chronic calcific tendinitis of the shoulder, the calcific materials are hard and adherent to the tendon. Removal of these materials can cause significant intratendinous tears between the superficial and deep layers of the degenerated rotator cuff. Thus far, there are no established surgical techniques for removing the calcific materials while ensuring cuff integrity. Good clinical results for rotator cuff repair were achieved by using an arthroscopic suture bridge technique in patients with long-standing calcific tendinitis. Intact rotator cuff integrity and recovery of signal change on follow-up magnetic resonance imaging scans were confirmed. This is a technical note about a surgical technique and its clinical results with a review of relevant published reports.
    Orthopaedic Surgery 11/2013; 5(4):289-292. DOI:10.1111/os.12070
  • Jong-Hun Ji · Mohamed Shafi · Jae-Jung Jeong · Sang-Eun Park ·
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    ABSTRACT: The purpose of this study was to determine the anatomical and clinical outcomes of a biceps-incorporating rotator cuff repair without detaching the biceps origin from the glenoid in a large or massive rotator cuff tear, in which the biceps tendon could be incorporated into the cuff defect and help to provide tendon healing and prevent upward migration of the humeral head. Thirty-five consecutive patients with a mean age of 62 years (41-81 years) had primary arthroscopic repair of their large or massive rotator cuff in which biceps tendon incorporated into the cuff defect without detaching the biceps tendon from the glenoid was performed. Functional outcome was determined by the visual analog scale (VAS) for pain during motions, simple shoulder test (SST), the University of California, Los Angeles (UCLA) score, and the American Shoulder and Elbow Surgeons scores (ASES) (mean follow-up, 24 months). The continuity of rotator cuff mechanism was evaluated using the magnetic resonance imaging (MRI) among all the patients after 2 years. At the final follow-up, mean VAS scores increased significantly from 7.1 to 2.0 points, ASES scores from 35 to 83, UCLA scores from 14 to 30, and SST scores from 4 to 9, respectively (p < 0.05). Moreover, the range of motion was significantly increased except the external rotation from preoperative 27° to postoperative 33° (p = 0.183). MRI evaluation showed that 22 of 35 patients (63 %) had heeled tendons and 7 patients (20 %) had partial re-tear. Of 35 patients, 6 (17 %) had a complete re-tear. Only 3 of these 6 patients were not satisfied with the result. Using this simple biceps-incorporating rotator cuff repair technique, we achieved good clinical and moderate anatomical results, and prevent superior migration of the humeral head in a large or massive rotator cuff tear. Level IV retrospective review.
    European Journal of Orthopaedic Surgery & Traumatology 10/2013; 24(8). DOI:10.1007/s00590-013-1323-x · 0.18 Impact Factor
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    ABSTRACT: PURPOSE: The purpose of this retrospective study was to evaluate the early results of arthroscopic treatment in patients with missed occult greater tuberosity (GT) fracture of the humerus using the arthroscopic suture-bridge fixation technique. METHODS: Between January 2007 and August 2010, we used arthroscopic suture-bridge fixation in 15 cases of missed occult GT fractures, which were referred to our department with persistent symptoms following trauma, despite physical therapy. Occult GT fracture was diagnosed with bone marrow edema seen on magnetic resonance imaging in all patients. There were 13 male and 2 female patients with a mean age of 45 years (range 31-67 years). Mean time period until the surgery following the initial trauma was 4 months (1.5-12 months). For the measurement of clinical outcomes, we assessed the range of motion and evaluated the University of California, Los Angeles (UCLA) American Shoulder and Elbow Surgeons (ASES) scores and simple shoulder test (SST). RESULTS: The early clinical results were evaluated in these patients at a mean of 24 months (range 14-36 months) after surgery. All the patients were satisfied with the surgery. The mean UCLA, ASES, and SST scores improved from preoperative 15, 39, and 2 to postoperative 33, 91, and 11, respectively (P < .05). Mean forward flexion, abduction, external rotation at the neutral position, and internal rotation were improved to 159°, 155°, 24°, and L1, respectively, at the final follow-up. CONCLUSION: In the occult GT fracture with persistent shoulder symptoms, arthroscopic suture-bridge fixation and early rehabilitation showed excellent clinical outcomes on a short-term follow-up study. LEVEL OF EVIDENCE: Retrospective review, Level IV.
    European Journal of Orthopaedic Surgery & Traumatology 04/2013; 24(4). DOI:10.1007/s00590-013-1212-3 · 0.18 Impact Factor
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    ABSTRACT: Background: We evaluated the short-term clinical outcomes and compared the component's sizes of reverse total shoulder arthroplasty (RTSA) in Korean Population. Materials and methods: We performed an RTSA on 42 patients between December 2007 to February 2010. The mean age at surgery was 72.5 ± 5.6 (10 men, 32 women) and average follow-up period was 24 months. Twenty-two cuff tears arthropathy, 15 irreparable massive rotator cuff tears with pseudoparalysis, 5 proximal humeral fractures, and 2 infection cases were included. We evaluated clinical outcomes and also the intra- and postoperative complications to determine if any of the complications were unique to the use of a RTSA in a Korean population. In the anatomic study, 92 uninjured shoulders of 92 patients were used for measuring the inferior glenoid size, and we compared the component's sizes of RTSA with those of the normal population. Results: The ASES (American Shoulder and Elbow), UCLA, and KS (Knee Society) scores significantly improved from preoperative 35 (0-63), 12 (5-27), and 39 (3-81) to postoperative 68 (37-95), 24 (16-35), and 68 (34-88), respectively (P < .05). Postoperative complications were seen in 20% and scapular notching 35%. Three patients required further surgery for shoulder dislocation, periprosthetic fracture, and stem loosening. In the anatomic study, mean radius of the inferior glenoid was 17.1 ± 2.1 mm in male and 15.4 ± 1.6 mm in female. Conclusion: The short-term clinical results of an RTSA in Korean population are excellent despite high complication rate. However, the size of the glenoid is sometimes smaller than the baseplate (29 mm diameter) in female patients. More adequate size of the glenoid component should be considered.
    Journal of shoulder and elbow surgery / American Shoulder and Elbow Surgeons ... [et al.] 02/2013; 22(8). DOI:10.1016/j.jse.2012.07.019 · 2.29 Impact Factor
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    ABSTRACT: Pseudoaneurysms in the foot are more often reported in the lateral plantar artery than the medial plantar artery, most likely because of its more superficial location. There are no reports of pseudoaneurysm of the medial plantar artery after trauma. We present two cases of pseudoaneurysm of the medial plantar artery after blunt foot trauma and foot laceration. This pseudoaneurysm compressed a posterior tibial nerve, resulting in tarsal tunnel syndrome. The patients were treated successfully using transcatheter embolization without the need for surgical intervention. The tarsal tunnel syndrome also subsided. Here, the authors report these cases and provide a review of literature.
    Archives of Orthopaedic and Trauma Surgery 12/2012; 133(3). DOI:10.1007/s00402-012-1672-7 · 1.60 Impact Factor
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    ABSTRACT: Extensor tendon triggering is a rare disease entity. Even less common is a case of extensor digiti minimi (EDM) double triggering caused by impingement on the extensor retinaculum. Herein, we describe one patient with EDM double triggering developed at the extensor retinaculum and over the metacarpal head caused by its impingement on the extensor retinaculum.
    Archives of Orthopaedic and Trauma Surgery 12/2012; 133(3). DOI:10.1007/s00402-012-1654-9 · 1.60 Impact Factor

Publication Stats

170 Citations
75.68 Total Impact Points


  • 2007-2015
    • Catholic University of Korea
      • • College of Medicine
      • • Department of Orthopedics
      Sŏul, Seoul, South Korea
  • 2008
    • Johns Hopkins University
      • Department of Orthopaedic Surgery
      Baltimore, Maryland, United States