Chul Hyun Park

Prof. Dr. Chul Hyun Park

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Research Focus & Metrics

Academic Career Length

15Years (2012-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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19 July 2017 in Journal of Bone and Joint Surgery
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Journal Article
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Chul Hyun ParkChul Hyun Park
Chul Hyun Park
WLWoo-Chun Lee
Woo-Chun Lee
Background: The aims of this study were to identify risk factors for the recurrence of hallux valgus deformity and to clarify whether recurrence after surgery to treat hallux valgus can be predicted using radiographic parameters assessed on immediate postoperative non-weight-bearing radiographs. Methods: A proximal chevron osteotomy combined with a distal soft-tissue procedure was performed by a single surgeon to treat moderate to severe hallux valgus deformity in 93 patients (117 feet). The feet were grouped according to nonrecurrence or recurrence. Changes in the hallux valgus angle, the intermetatarsal angle, and sesamoid position over time were analyzed by comparing values measured during each postoperative period. The relative risks of recurrence as indicated by preoperative and postoperative radiographic parameters were determined. Results: Twenty (17.1%) of the 117 feet showed hallux valgus recurrence at the time of the last follow-up. The hallux valgus angle and the intermetatarsal angle stabilized at 6 months after surgery in the nonrecurrence group. An immediate postoperative hallux valgus angle of ≥8°, an immediate postoperative sesamoid position of grade 4 or greater, a preoperative metatarsus adductus angle of ≥23°, and a preoperative hallux valgus angle of ≥40° were significantly associated with recurrence. Conclusions: Recurrence of hallux valgus after a proximal chevron osteotomy can be reliably predicted from immediate postoperative non-weight-bearing radiographs. Level of Evidence: Therapeutic Level III. See Instructions for Authors for a complete description of levels of evidence.

31 May 2019 in Journal of Yeungnam Medical Science
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Chul Hyun ParkChul Hyun Park
Chul Hyun Park
Min Cheol ChangMin Cheol Chang
Min Cheol Chang
Forefoot disorders are often seen in clinical practice. Forefoot deformity and pain can deteriorate gait function and decrease quality of life. This review presents common forefoot disorders and conservative treatment using an insole or orthosis. Metatarsalgia is a painful foot condition affecting the metatarsal (MT) region of the foot. A MT pad, MT bar, or forefoot cushion can be used to alleviate MT pain. Hallux valgus is a deformity characterized by medial deviation of the first MT and lateral deviation of the hallux. A toe spreader, valgus splint, and bunion shield are commonly applied to patients with hallux valgus. Hallux limitus and hallux rigidus refer to painful limitations of dorsiflexion of the first metatarsophalangeal joint. A kinetic wedge foot orthosis or rocker sole can help relieve symptoms from hallux limitus or rigidus. Hammer, claw, and mallet toes are sagittal plane deformities of the lesser toes. Toe sleeve or padding can be applied over high-pressure areas in the proximal or distal interphalangeal joints or under the MT heads. An MT off-loading insole can also be used to alleviate symptoms following lesser toe deformities. Morton's neuroma is a benign neuroma of an intermetatarsal plantar nerve that leads to a painful condition affecting the MT area. The MT bar, the plantar pad, or a more cushioned insole would be useful. In addition, patients with any of the above various forefoot disorders should avoid tight-fitting or high-heeled shoes. Applying an insole or orthosis and wearing proper shoes can be beneficial for managing forefoot disorders.

1 February 2021 in The Bone & Joint Journal
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Journal Article
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Chul Hyun ParkChul Hyun Park
Chul Hyun Park
HYHongfei Yan
Hongfei Yan
JPJeongjin Park
Jeongjin Park
Aims: No randomized comparative study has compared the extensile lateral approach (ELA) and sinus tarsi approach (STA) for Sanders type 2 calcaneal fractures. This randomized comparative study was conducted to confirm whether the STA was prone to fewer wound complications than the ELA.Methods: Between August 2013 and August 2018, 64 patients with Sanders type 2 calcaneus fractures were randomly assigned to receive surgical treatment by the ELA (32 patients) and STA (32 patients). The primary outcome was development of wound complications. The secondary outcomes were postoperative complications, pain scored of a visual analogue scale (VAS), American Orthopaedic Foot and Ankle Society (AOFAS) score, 36-item Short Form health survey, operative duration, subtalar joint range of motion (ROM), Böhler’s angle and calcaneal width, and posterior facet reduction.Results: Although four patients (12.5%) in the ELA groups and none in the STA group experienced complications, the difference was not statistically significant (p = 0.113). VAS and AOFAS score were significantly better in the STA group than in the ELA group at six months (p = 0.017 and p = 0.021), but not at 12 months (p = 0.096 and p = 0.200) after surgery. The operation time was significantly shorter in the STA group than in the ELA group (p < 0.001). The subtalar joint ROM was significantly better in the STA group (p = 0.015). Assessment of the amount of postoperative reduction compared with the uninjured limb showed significant restoration of calcaneal width in the ELA group compared with that in the STA group (p < 0.001).Conclusion: The ELA group showed higher frequency of wound complications than the STA group for Sanders type 2 calcaneal fractures even though this was not statistically significant. Cite this article: Bone Joint J 2021;103-B(2):286–293.

15 January 2020 in Gut and Liver
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KJKyong Jin Jung
Kyong Jin Jung
Gun Woo LeeGun Woo Lee
Gun Woo Lee
Chul Hyun ParkChul Hyun Park
Chul Hyun Park
TLTae-Jin Lee
Tae-Jin Lee
JKJoo-Young Kim
Joo-Young Kim
ISIn-Hwan Song
In-Hwan Song
Kyong-Jin Jung, Kun Woo Lee, Chul Hyun Park, Tae-Jin Lee, Joo-Young Kim, Eon-Gi Sung, Seong Yong Kim, Byung Ik Jang, and In-Hwan Song. Gut and Liver 1999;0:. https://doi.org/10.5009/gnl18438

28 January 2018 in Foot & Ankle International
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Journal Article
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Chul Hyun ParkChul Hyun Park
Chul Hyun Park
DYDoo Hyung Yoon
Doo Hyung Yoon
This study was conducted to evaluate the usefulness of subtalar arthroscopy in the operative treatment of Sanders type 2 calcaneus fractures using a sinus tarsi approach. Forty-six Sanders type 2 calcaneal fractures were consecutively treated using a sinus tarsi approach. Intraoperative fluoroscopy was used to evaluate fracture reduction in the first 23 patients (fluoroscopy group), and intraoperative fluoroscopy and subtalar arthroscopy were used in the latter 23 patients (arthroscopy group). Clinical evaluations were performed using a visual analog scale, the Ankle-Hindfoot Scale developed by the American Orthopaedic Foot and Ankle Society, and Short Form Health Survey. Radiographic evaluations were performed using calcaneal and lateral radiographs and computed tomography (CT) scans. Böhler’s angles and calcaneal widths were compared between the groups. Reduction of the posterior facet was graded according to articular step, defect, and angulation of the posterior facet on CT. At the last follow-up, clinical results as well as Böhler’s angles and calcaneal widths were not different between the groups. On immediately postoperative CT, reduction of the posterior facet showed a higher-than-good grade in 17 feet (73.9%) in the fluoroscopy group and a higher-than-good grade in 22 feet (95.7%) in the arthroscopy group, and these values were significantly different between the groups (P = .04). A combined approach using fluoroscopy and subtalar arthroscopy showed better reduction of the posterior facet on CT than using fluoroscopy alone. Therefore, subtalar arthroscopy could be a useful method for detecting joint incongruence when using the sinus tarsi approach for Sanders type 2 calcaneal fractures. Level III, comparative series.

1 September 2012 in Journal of Orthopaedic Science
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OSOog-Jin Shon
Oog-Jin Shon
Chul Hyun ParkChul Hyun Park
Chul Hyun Park