• Journal of the Korean Orthopaedic Association
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• v.56 no.3
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• pp.272-276
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• 2021

Most acute patella dislocations can be reduced closely using a spontaneous or simple maneuver, but it may not be possible if accompanied the by anomalies, such as rotation of the patella, osteophyte ridge protruding from the femur, or anatomical variations. This case report outlines irreducible acute patella dislocation with anatomical variations, a notched patella. If the reduction of an acute patella dislocation fails, an additional radiological examination and reduction under general anesthesia may be necessary with the possibility of an anatomical variant in mind.

• Journal of Korean Orthopaedic Sports Medicine
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• v.8 no.2
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• pp.121-124
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• 2009

Patellar fractures in children represent less than 2% of all patellar fractures including adults, and occur about 1% of all pediatric fractures. Because of property of the growing patella, osteochondral or avulsion fractures are more common in children and the most common type of patella fracture in children is sleeve fracture. Avulsion or sleeve fractures of the patella in children can occur at the superior or inferior pole of the patella. Most reported cases of sleeve fracture are involving the inferior patellar pole, but involving the superior patellar pole is very rare. We experienced a case of sleeve fracture occurred at the superior pole of the patella in a sixteen-year-old boy and report this case with literature review.

• Journal of the Korea Computer Graphics Society
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• v.26 no.1
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• pp.1-6
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• 2020

Patella surgery of small animal is an important veterinary surgery that the veterinarian should saw and drill the dislocated patella in order to fix the corrected position. However, the animal protection laws restrict the veterinarian students' chances for the practice and training of the patella surgery. This paper proposed a haptic based patella surgery simulator for veterinarian students. We modelled force feedback methods in order to provide best similar haptic feedbacks to the real drilling feedbacks in the patella surgery. The proposed patella drilling simulator provides haptic interface as a drill and a workbench in order to provide best surgery experiences. We conducted the performance evaluations in order to prove usability of the proposed patella surgery interface.

• Journal of Biomedical Engineering Research
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• v.19 no.1
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• pp.53-58
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• 1998

This study examined the distribution of bone mineral density(BMD) and the von Mises stress in the patella. The BMD of eighteen patellae were determined by using quantitative computed tomography and imaging analysis software. It was found that the BMD of the patella varied with location. BMD values were largest at the superior and lateral regions and decreased inferiorly and medially. This distribution appeared to correspond to the organization of trabeculae within the patella. A two-dimensional finite element analysis was performed on each patella. It was also found that the maximum von Mises stress in the patella occurred along the cortical shell on the non-articular surface. The trabecular von Mises stress existed in the posterior region of the patella. These findings demonstrated the potential for finite element studies in vivo. Further, such studies may lead to the development of custom-made, patient-specific patella prostheses.

• Journal of Korean Orthopaedic Sports Medicine
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• v.3 no.1
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• pp.60-65
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• 2004

Purpose: The purpose of this study was to evaluate the results of limited vastus lateralis release for treatment of painful bipartite patella. Materials and Methods: From Jan. 1995 to Jun. 2002, we performed limited lateral retinacular release in 14 patients(16 cases) for treatment of painful bipartite patella. All patients were men and mean age was 22.3 years old. The opeative techique was that insertion of the vastus lateralis to the painful patellar fragment is detached subperiosteally. We evaluated the clinical results by degree of pain and level of activity. Also we analyzed the radiologic findings by measuring fragment tilting angle and gap between fragments. The mean follow up period was 14 months. Results: At final follow up, all of the patients showed pain relief and can be returned to more than recreational sports activity after the operation. On radiologic findings, fragment tilting angle and gap between fragments were reduced at statistically significant level. Conclusion: The limited lateral retinacular release for treatment of painful bipartite patella is one of good methods which is less invasive and shows good results in clinical and radiologic findings.

• Journal of the Korean Orthopaedic Association
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• v.56 no.6
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• pp.540-545
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• 2021

A transverse fracture is the most common type of displaced patella fracture requiring surgery. These fractures are commonly fixed with parallel Kirschner wires or screws that cross the fracture line, often with an additional tension band. Nevertheless, conventional fixation methods of patella fractures have prevalent complications caused by the protrusion of wires or pins. These complications necessitate additional surgery for hardware removal, increase medical cost, and can limit the function of the knee joint. This paper reports cases treated with a minimally invasive load-sharing percutaneous suture of the patella tendon. The procedure provides reliable fixation for transverse patella fractures, minimizes soft tissue injuries, preserves blood flow, and reduces postoperative pain. In addition, the procedure also reduces the irritation and pain caused by the internal fixture, thereby reducing the risk of restricted knee joint movement.

• Journal of Korean Orthopaedic Sports Medicine
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• v.7 no.2
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• pp.75-83
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• 2008

과사용 증후군은 정상적인 조직에 최대하 부하(submaximal stress)가 지속되어 발생하는 것이다. 이와 같은 현상은 연부조직의 접합부(junction)에서 주로 일어나며 힘의 전달이 집중되는 곳, 조직의 역학적 성질이 변화되는 곳, 그리고 성장시 빨리 변화하는 성질이 있는 곳에 주로 생긴다. 근육의 불균형이 과사용 증후군의 가장 많은 원인이다. 과거의 부상 이후 부적절한 재활치료 및 각형성 또는 회전 부정정렬(angular and rotational malalignment) 등이 과사용 증후군의 원인이 될 수 있다. 스포츠 훈련 방법의 실수로도 과사용 증후군이 생길 수 있다. 전방 슬관절 동통시 감별해야 할 질환들은 jumper's knee, 슬개건염 혹은 대퇴 사두건염, Osgood-Schlatter 병, Sinding-Larsen-Johansson 병, 슬개골 연골 연화증, 슬개골 전(prepatellar) 혹은 슬개골 하(infrapatellar) 점액낭염, Hoffa's fat pad의 염증, 그리고 특발성 전방 슬관절 동통 증후군(idiopathic anterior knee pain syndrome)등이 있다. 후방 슬관절 통증의 원인 질환으로는 만성 슬와근 염좌, 슬괵건 점액낭염, 경골 골간단의 피로 골절 등이 포함되며 외측 슬관절 통증의 원인으로는 장경대 충돌 증후군(iliotibial band friction syndrome)등이 있을 수 있다. 이외 과사용 증후군과 관련된 슬관절 통증의 원인으로 다분 슬개골(multipartite patella), 내측 경골 스트레스 증후군(medial tibial stress syndrome), 박리성 골연골염, 반월상 연골의 퇴행성 변화 등이 있을 수 있다. 과사용 증후군의 진단 및 치료의 일반적인 접근법은 다섯가지 단계의 프로그램으로 요약될 수 있다. 첫째, 원인 요소를 확인하고, 둘째, 요소를 변경시키고, 셋째, 통증을 조절하고, 넷째, 능동적 재활을 시키고, 그리고 다섯째, 유지시키는 것이다.

• Journal of the Korean Orthopaedic Association
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• v.56 no.4
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• pp.341-345
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• 2021

The infrapatellar fat pad (IPFP) is one of three fat pads located about the anterior knee. Injury in this region is relatively common. Damage to the IPFP is caused mostly by an iatrogenic injury from a surgical procedure or repeated small collision trauma. The authors experienced a case of an IPFP injury, that has not been reported in the domestic or international literature. In this case, acute IPFP separation followed by a contusion at the anterior aspect of knee in the kneeling position, confirmed using magnetic resonance imaging. The patient was fully recovered with conservative treatment.

• Journal of Korean Orthopaedic Sports Medicine
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• v.10 no.2
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• pp.121-123
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• 2011

The medial patellar plica may cause symptoms when it becomes thickened and fibrotic because of direct trauma or repetitive sporting activities. The medial plica syndrome has been noticed as one of major causes of internal derangement and well documented in the articles. A few cases of the bucket handle tear of the medial plica are described in liteartures. To our knowledge, however, there have never been reported about it in domestic literatures. We present a case of the bucket handle tear of the medial plica resected by arthroscopic surgery with a review of the relevant articles.

• Journal of the Korean Arthroscopy Society
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• v.10 no.2
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• pp.214-218
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• 2006

Purpose: We describe a new technique of arthroscopic medial plication using pull-out suture with consideration of anatomical location of medial patellofemoral ligament for the treatment of acute or recurrent patellar dislocation. Operative technique: Under arthroscopic examination, sutures are passed through the medial capsule, at which medial patellofemoral ligament is located, from outside to inside of knee joint. Three guide wires are inserted from anterior surface of the patella to upper half of its medial border. Intraarticular portions of sutures are pulled out toward anterior surface of the patella through bony tunnels. Under appropriate tension, the sutures are tied after performing lateral retinacular release. Conclusion: As suturing medial patellofemoral ligament, this technique can maximize the effect of medial plication and can correct subluxation and tilt of the patella. It seems to be a minimally invasive, easy and effective method for the treatment of acute or recurrent patellar dislocation.