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Epicondylar ratio

Jung-Taek Kim, Jun Han, Quan Hu Shen, Sung Won Moon, Ye-Yeon Won
BACKGROUND: "Grand-piano sign" has been used as a popular benchmark to facilitate correct rotational alignment during total knee arthroplasty (TKA). The purpose was to quantitatively determine morphological patterns on anterior femoral resection in mechanically aligned (MA) and kinematically aligned (KA) TKA. METHODS: Computed tomography scans of 60 TKA candidates were reconstructed into 3D models. Femurs were virtually cut with a 3D imaging program using various anterior flange flexion angles (AFFAs) of 3°, 5°, and 7°...
April 9, 2018: Journal of Arthroplasty
Takao Minami, Hideyuki Koga, Ichiro Sekiya, Toshifumi Watanabe, Masafumi Horie, Hiroki Katagiri, Koji Otabe, Toshiyuki Ohara, Mai Katakura, Takeshi Muneta
PURPOSE: Discoid meniscus often causes mechanical problems and needs surgical treatment at an early age. However, many aspects of its morphological development and changes remain unknown. The purpose of this study was to investigate the insertion of the femoral anterior cruciate ligament (ACL) via the behind-ACL approach and the morphology of the lateral femoral condyle to which the ACL attaches to clarify the morphological characteristics of the knee with discoid lateral meniscus (DLM)...
March 2018: Journal of Orthopaedic Science: Official Journal of the Japanese Orthopaedic Association
Ichiro Tsukamoto, Masao Akagi, Shigeshi Mori, Shinji Inoue, Shigeki Asada, Fuminori Matsumura
BACKGROUND: In unicompartmental knee arthroplasty (UKA), there is no consensus regarding how to determine the anteroposterior (AP) reference of the tibia. A number of surgeons in Japan perform the sagittal saw cut using the medial intercondylar ridge (MIR) of the tibia according to surgical manuals. However, there is no theoretical basis for this practice. METHODS: Preoperative computed tomography data from 32 lower limbs of 31 Japanese patients who received UKA were used...
May 4, 2017: Journal of Arthroplasty
Kyoung-Tak Kang, Juhyun Son, Oh-Ryong Kwon, Changhyun Baek, Dong Beom Heo, Kyoung-Mi Park, Ho-Joong Kim, Yong-Gon Koh
BACKGROUND: We aimed to evaluate differences in femoral arthometric data for 700 osteoarthritic knees (587 females and 113 males) with respect to gender in a Korean population. METHODS: We identified and measured the mediolateral (ML) and anteroposterior (AP) lengths, femoral aspect ratio (ML/AP), surgical epicondylar axis (SEA), and Whiteside's line (WL). In addition, the anterior, posterior, and distal bone resections of the implanted femurs were evaluated using SEA and WL as references using a three-dimensional analysis method...
December 2016: Knee
Serdar Yilmaz, Deniz Cankaya, Alper Deveci, Ahmet Firat, Bulent Ozkurt, Murat Bozkurt
BACKGROUND: Hinged knee prosthesis is an effective treatment method as a salvage procedure in marked ligamentous insufficiency and severe bone defects. Joint line determination and restoration are difficult due to large bone defects and distorted anatomy. We evaluated the impact of joint line alteration on the outcome in rotating hinge knee arthroplasty (RHKA). MATERIALS AND METHODS: 35 patients who had rotating hinged knee prosthesis applied between 2008 and 2013 were evaluated in this retrospective study...
March 2016: Indian Journal of Orthopaedics
Emmanuel Thienpont, Massimiliano Bernardoni, Tyler Goldberg
BACKGROUND: To analyze aspect ratio (AP size/ (ML) size) of osteoarthritic knees at four different areas of the femur and to observe if proximalization of the femoral cut would change the ML size as well as confirm that external rotation increases the measurements for the AP dimensions of the femur. METHOD: From the available MyKnee database (Medacta International, Castel San Pietro, Switzerland) 1030 patients were randomly selected within 20° of deformity consisting of 400 men with a mean (SD) age of 67...
October 2016: Knee
Jesper L Boldsen, George R Milner, Søren K Boldsen
OBJECTIVES: A new procedure for skeletal sex estimation based on humeral and femoral dimensions is presented, based on skeletons from the United States. The approach specifically addresses the problem that arises from a lack of variance homogeneity between the sexes, taking into account prior information about the sample's sex ratio, if known. MATERIAL AND METHODS: Three measurements useful for estimating the sex of adult skeletons, the humeral and femoral head diameters and the humeral epicondylar breadth, were collected from 258 Americans born between 1893 and 1980 who died within the past several decades...
December 2015: American Journal of Physical Anthropology
Francesco Iacono, Giovanni Francesco Raspugli, Giuseppe Filardo, Danilo Bruni, Stefano Zaffagnini, Simone Bignozzi, Mirco Lo Presti, Ibrahim Akkawi, Maria Pia Neri, Maurilio Marcacci
PURPOSE: The restoration of the physiological femoro-tibial joint line (JL) is important to obtain a good outcome in revision total knee arthroplasty (RTKA). However, its assessment is challenging. The ratio of the distance between the adductor tubercle (AT) JL (ATJL) and the trans-epicondylar femoral width (FW) was proposed as a reliable method. The purpose of this study was to check whether this ratio is a reliable tool to restore the prosthetic JL height in challenging prosthetic revision cases...
October 2016: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
Masataka Nishikawa, Hajime Owaki, Shoichi Kaneshiro, Takeshi Fuji
PURPOSE: The objectives of this study were to measure the morphometric parameters of preoperative distal femurs to determine the differences by diagnosis and gender after accounting for skeletal size. METHODS: One-hundred and seventy-nine Japanese patients who underwent total knee arthroplasty (TKA) (25 males and 154 females) were assessed. The anteroposterior length (AP), mediolateral width (ML), aspect ratio (AR), surgical epicondylar axis (SEA) to posterior condylar axis (PCA) angle, and Whiteside to SEA angle were measured on preoperative computed tomography scans...
December 2014: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
T Luyckx, L Beckers, W Colyn, H Vandenneucker, J Bellemans
PURPOSE: In this study, the value of the adductor tubercle as landmark for joint line reconstruction in revision total knee arthroplasty (TKA) was investigated. METHODS: On 100 calibrated full-leg standing radiographs obtained from healthy volunteers, distances from the medial epicondyle, the lateral epicondyle, the adductor tubercle, the fibular head and the centre of the knee to the joint line were determined. RESULTS: The average distance to the joint line from the medial epicondyle, the lateral epicondyle, the adductor tubercle and the fibular head was found to be 27...
December 2014: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
Ralf Bieger, Klaus Huch, Semra Kocak, Sebastian Jung, Heiko Reichel, Thomas Kappe
INTRODUCTION: Restoring the joint line (JL) in primary as well as revision total knee arthroplasty (TKA) influences clinical results as well as long-term survival rates. Whereas studies agree about the negative effect of JL alteration, the reference system of choice is unclear. The purpose of the present study was to evaluate the effect of JL allocation comparing a ratio to a distance method on clinical outcome following revision TKA. MATERIALS: After a miminum follow-up of 2 years JL reconstruction was evaluated in 69 consecutive patients after revision TKA...
April 2014: Archives of Orthopaedic and Trauma Surgery
Kilian Wegmann, K J Burkhart, T C Koslowsky, J Koebke, W F Neiss, L P Müller
PURPOSE: Distal humeral fractures are rare, but severe injuries, the treatment of which is often accompanied by serious complications and its outcome strongly depends on the quality of surgical therapy. Non-union is a common entity, compromising clinical results and requiring revision surgery. Osteonecrosis is an underestimated etiologic factor in the development of non-union. The present study aims to display the distribution patterns of the arterial vessels at the distal humerus, to correlate the displayed vessels with local nutrient foramina and to disclose an endangerment of these structures by common osteosynthetic implants...
September 2014: Surgical and Radiologic Anatomy: SRA
Joe F Jabre, Giovanna M Squintani, Kenneth K H Chui
INTRODUCTION: Near-infrared spectroscopy (NIRS) is a non-invasive technique used to measure tissue oxygenation. In this study we describe oxyneurography (ONG), a novel application of the NIRS technique in non-invasive surface measurement of oxygenation in ulnar nerve. METHODS: NIRS sensors were applied directly over the ulnar epicondylar groove to measure the ulnar nerve ONG index, a ratio of oxygenated over total hemoglobin content. Ulnar motor conduction studies were obtained in all subjects...
January 2012: Muscle & Nerve
T S Rajagopal, D Nathwani
Restoration of the position of the prosthetic joint line (JL) to the same level as the original JL is a challenging problem in primary adn revision knee arthroplasty, and there is no reliable method for achieving this objective. We hypothesized that there is a constant ratio between the interepicondylar distance (IED) and the perpendicular distance from this interepicondylar line to the JL and analyzed 100 computed tomography scans of the knee to study this relationship. The IED and the perpendicular distance from this interepicondylar line to the JL was measured using both the clinical epicondylar axis (CEA) and the surgical epicondylar axis (SEA)...
April 2011: American Journal of Orthopedics
Andrew J Lewis, Gary A Sod, Daniel J Burba, Colin F Mitchell
OBJECTIVES: To compare compression pressure (CP) of 6.5 mm Acutrak Plus (AP) and 4.5 mm AO cortical screws (AO) when inserted in simulated lateral condylar fractures of equine 3rd metacarpal (MC3) bones. STUDY DESIGN: Paired in vitro biomechanical testing. SAMPLE POPULATION: Cadaveric equine MC3 bones (n=12 pair). METHODS: Complete lateral condylar osteotomies were created parallel to the midsagittal ridge at 20, 12, and 8 mm axial to the epicondylar fossa on different specimens grouped accordingly...
January 2010: Veterinary Surgery: VS
Mikio Harada, Masatoshi Takahara, Nariyuki Mura, Junya Sasaki, Tomokazu Ito, Toshihiko Ogino
HYPOTHESIS: There are some risk factors that could predispose a young baseball player to elbow injuries. MATERIALS AND METHODS: Study participants were 294 baseball players aged 9 to 12 years old. A questionnaire, physical examination, and ultrasound imaging to investigate elbow injuries were performed. Data for the groups with and without elbow injuries were analyzed statistically using multivariate logistic regression models. RESULTS: Ultrasound imaging showed that 60 participants had elbow injuries, including medial epicondylar fragmentation in 58 and osteochondritis dissecans of the capitellum in 2...
June 2010: Journal of Shoulder and Elbow Surgery
Georg Osterhoff, Sabine Löffler, Hanno Steinke, Christine Feja, Christoph Josten, Pierre Hepp
The ovine stifle has been increasingly used as a large animal model for the human knee. Still, comparative anatomical measurements of the knee in sheep and humans are missing. Thus, the purpose of this study was to describe and measure the osseous anatomy of the ovine stifle in comparison to the human knee. Twenty-four stifles of skeletal-mature merino-sheep and 24 human cadaver knees were obtained and distances between selected anatomical structures of the distal femur, the proximal tibia, and the patella were measured digitally and documented...
March 2011: Knee
S Kamineni, H Ankem, D K Patten
The percutaneous placement of lateral distal humeral pins risks injury to the radial nerve. We aimed to provide a reliable and safe parameter for the insertion of lateral distal humeral pins. A secondary aim of this study was to investigate the effect of pin/screw placement in the intended zone of fixation at the lateral distal humerus. We dissected 70 fresh cadaveric upper limbs and the radial nerve was identified and its course followed into the anterior compartment. The point where the radial nerve crosses humerus in mid lateral plane was identified and the distance between this point and lateral epicondyle was measured, as was the maximum trans-epicondylar distance, along with the olecranon fossa height...
September 2009: Clinical Anatomy
Bin Yang, Hongbo Tan, Lui Yang, Gang Dai, Botao Guo
Cartilage lesion of the patellofemoral joint is a common and challenging disease of the knee and an important cause of anterior knee pain. There are many naturally occurring variations in the anatomy and congruence of the patella and femoral trochlea. The purpose of this study was to identify the variations in patellofemoral anatomy and congruency that predispose to cartilage lesions. Among patients who underwent knee arthroscopy in our center from January 2005 to December 2006, 111 patients with chronic patellofemoral cartilage lesions and anterior knee pain were selected as the lesion group, while 124 patients with isolated meniscus rupture without anterior knee pain were selected as the control group...
January 2009: Orthopedics
O D E Morgan, J A Reetz, D C Brown, S M Tucker, P D Mayhew
OBJECTIVE: To determine outcome, report complications, and risk factors for complications associated with the surgical treatment of fractures of the lateral aspect of the humeral condyle (FLHC) in dogs. STUDY DESIGN: Fifty dogs with FLHC that had been repaired surgically were included in this retrospective case series. METHODS: The medical records and radiographs from 50 dogs with FLHC from 1990--2006 were analyzed. RESULTS: The complication rate was 30%...
2008: Veterinary and Comparative Orthopaedics and Traumatology: V.C.O.T
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