Search Our Scientific Publications & Authors

Orthop J Sports Med 2019 Jan 9;7(1):2325967118820507. Epub 2019 Jan 9.

The Stadium Sports Medicine Clinic, Sydney, New South Wales, Australia.

Open Orthop J 2016 22;10:26-35. Epub 2016 Mar 22.

Department of Orthopaedic Surgery, Institute of Clinical Medicine, and University Hospital, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8575, Japan.

Background: In cementless total hip arthroplasty, imageless computer-assisted navigation is usually used to register the anterior pelvic plane (APP). The accuracy of this method is influenced by the subcutaneous tissues overlying the registration landmarks. On the other hand, the acetabular center axis (ACA) is determined from the acetabular rim. Read More

J Phys Ther Sci 2016 Jan 29;28(2):632-4. Epub 2016 Feb 29.

Department of Physical Therapy, College of Biomedical Science and Engineering, Inje University, Republic of Korea.

[Purpose] The purpose of this study was to investigate activities of the hip extensors and erector spinae during bridging exercise by using instruments with a laser pointer on the pelvic belt. [Subjects] Twelve subjects (age, 23 to 33 years) with non-specific low back pain volunteered for this study. [Methods] Subjects performed bridging exercises with and without trajectory exercises by using a laser pointer fixed to a pelvic strap. Read More

Cochrane Database Syst Rev 2016 Mar 14;3:CD003004. Epub 2016 Mar 14.

Patient Safety Research, Royal Lancaster Infirmary, Pointer Court 1, Ashton Road, Lancaster, UK, LA1 1RP.

Background: Proximal femoral fracture (PFF) is a common orthopaedic emergency that affects mainly elderly people at high risk of complications. Advanced methods for managing fluid therapy during treatment for PFF are available, but their role in reducing risk is unclear.

Objectives: To compare the safety and effectiveness of the following methods of perioperative fluid optimization in adult participants undergoing surgical repair of hip fracture: advanced invasive haemodynamic monitoring, such as transoesophageal Doppler and pulse contour analysis; a protocol using standard measures, such as blood pressure, urine output and central venous pressure; and usual care. Read More

Anesthesiology 2015 Dec;123(6):1481-2

Mayo Clinic, Rochester, Minnesota.

Int J Comput Assist Radiol Surg 2015 Jun 18;10(6):761-71. Epub 2015 Apr 18.

Department of Computer Science, Johns Hopkins University, Baltimore, MD, 21218, USA,

Purpose: We present a registration method for computer-assisted total hip replacement (THR) surgery, which we demonstrate to improve the state of the art by both reducing the invasiveness of current methods and increasing registration accuracy. A critical element of computer-guided procedures is the determination of the spatial correspondence between the patient and a computational model of patient anatomy. The current method for establishing this correspondence in robot-assisted THR is to register points intraoperatively sampled by a tracked pointer from the exposed proximal femur and, via auxiliary incisions, from the distal femur. Read More

Clin Sports Med 2013 Apr 8;32(2):325-30. Epub 2013 Feb 8.

Primary Care Sports Medicine Fellow, Department of Family Medicine, University of Connecticut, Hartford, CT 06088, USA.

The term, hip pointer, is applied in the setting of a blunt trauma injury to the iliac crest. It typically occurs in contact and collision sports and can cause significant pain and loss of practice or game time. A direct blow results in subperiosteal edema with hematoma formation within surrounding muscle or soft tissue and bone contusion of the iliac crest. Read More

J Fam Pract 2012 Dec;61(12):736-44

Division of Sports Medicine, Department of Orthopedic Surgery, Rush University Medical Center, Chicago, IL, USA.

When a patient who's physically active complains of hip pain, don't be too quick to label it a "hip pointer" that requires time and rest to heal. Consider this more nuanced-and effective-approach. Read More

PLoS One 2012 1;7(8):e41583. Epub 2012 Aug 1.

Biomechanics and Movement Science Program, University of Delaware, Newark, Delaware, United States of America.

Background: Studies of human upright posture typically have stressed the need to control ankle and hip joints to achieve postural stability. Recent studies, however, suggest that postural stability involves multi degree-of-freedom (DOF) coordination, especially when performing supra-postural tasks. This study investigated kinematic synergies related to control of the body's position in space (two, four and six DOF models) and changes in the head's orientation (six DOF model). Read More

Biomed Tech (Berl) 2012 May 16;57(4):239-48. Epub 2012 May 16.

Helmholtz Institute for Biomedical Engineering, RWTH Aachen University, Germany.

In total hip replacement, patient placement in the lateral position is preferred by many surgeons. However, it complicates registration of the so-called pelvic coordinate system that is the standard reference for surgeons to measure cup orientation. This coordinate system comprises the anterior pelvic plane and the mid-sagittal plane, and it is conventionally registered on the basis of bony anatomical landmarks including the left and the right anterior superior iliac spine (ASIS). Read More

J Nat Sci Biol Med 2012 Jan;3(1):52-9

Department of Anthropology, University of Delhi, Delhi, India.

Objective: To study the relationship of ethnicity with overweight/obesity, variation in adiposity levels, regional distribution of fat and its impact on cardio-respiratory health among selected ethnic groups.

Materials And Methods: A cross-sectional study was carried out among 300 young adults of three ethnic groups from different geographical regions of India ranging in age from 20 to 30 years. Stature, weight, circumferences, body fat percentage, and skinfold thicknesses were measured. Read More

Technol Health Care 2010 ;18(4-5):341-51

Orthopaedic Department, Center for Musculoskeletal Surgery, Charité, Berlin, Germany.

Background: Precise identification of bony landmarks by use of pointer based navigation systems is influenced by thickness of soft tissue. Ultrasound-based navigation systems try to overcome the problems of positional deviation associated with soft tissue. The aim of the study was to investigate the influence of the BMI and the thickness of the soft tissue on the post-operative cup position and accuracy in the application of an ultrasound-based (US CAOS) and a pointer-based navigation system (P CAOS). Read More

Comput Aided Surg 2010 10;15(4-6):75-82. Epub 2010 Nov 10.

Institute of Surgical Technology and Biomechanics, University of Bern, Bern, Switzerland.

Introduction: A novel computerized algorithm for hip joint motion simulation and collision detection, called the Equidistant Method, has been developed. This was compared to three pre-existing methods having different properties regarding definition of the hip joint center and behavior after collision detection. It was proposed that the Equidistant Method would be most accurate in detecting the location and extent of femoroacetabular impingement. Read More

Oper Orthop Traumatol 2010 Jul;22(3):307-16

LVR Klinik für Orthopädie, Viersen, Germany.

Objective: Precise implantation of hip resurfacing arthroplasty by imageless computer navigation. Hence a malalignment of the femoral component, leading to early loss of the implant, can safely be avoided.

Indications: Coxarthrosis in patients with normal bone mineral density; only minor deformity of the femoral head that enables milling around the femoral neck without notching. Read More

Arch Orthop Trauma Surg 2011 Feb 20;131(2):167-72. Epub 2010 May 20.

Department of Orthopaedic Surgery, ENDO-Klinik Hamburg GmbH, Germany.

Introduction: Arthroscopic femoral osteoplasties might be technically demanding, might cause prolonged operative times and restrict the intraoperative overview. An automated navigated matching process of preoperative CT-data and intraoperative fluoroscopy should allow for noninvasive registration for FAI-surgery.

Method: Six hip joints were used with a conventional navigation system. Read More

Cases J 2009 Jun 29;2:6487. Epub 2009 Jun 29.

Department of Orthopaedics, Government Hospital for Bone and Joint Surgery Barzullah Srinagar, 190005 India.

Introduction: Ewing's sarcoma is second most common primary malignant bone neoplasm in children and adolescents. We report a case of Ewing's sarcoma of ilium in an 18-year-old female mimicking clinically and radiologically inflammatory arthritis of hip joint, a rare entity not mentioned in literature.

Case Presentation: An 18-year-old girl presented with pain hip, limp and fever off and on. Read More

Orthopedics 2008 Oct;31(10 Suppl 1)

Orthopaedic Department, Charite, Chariteplatz 1, 10117 Berlin, Germany.

The use of navigation techniques in primary total hip arthroplasty improves the position of endoprosthetic components, especially cup positioning. An intraoperative registration of the anterior pelvic plane is necessary to define the anteversion and inclination angles on the acetabular side. This study compares the accuracy of manual pointer palpation to ultrasound registration in navigation to determine pelvic plane registration in 60 cases of minimally invasive surgical technique. Read More

Zhonghua Yi Xue Za Zhi 2008 Dec;88(45):3226-9

Department of Orthopedics, Shanghai 10th People's Hospital, Shanghai 200072, China.

Objective: To investigate the effect of a new technique of navigated percutaneous placement of iliosacral screws using intra-operative three-dimensional (3D) imaging.

Methods: Sixteen patients with hip fracture were placed in supine position. After the reference marker was fixed on the iliac crest, a 3-D C-arm navigation system was used intra-operatively to obtain 3D images that were transferred to the navigation system by an automatic. Read More

Proc Inst Mech Eng H 2007 Oct;221(7):739-53

mNemoscience, Obach-Palenberg, Germany.

Computer assisted orthopaedic surgery (CAOS) technology has recently been introduced to overcome problems resulting from acetabular component malpositioning in total hip arthroplasty. Available navigation modules can conceptually be categorized as computer tomography (CT) based, fluoroscopy based, or image-free. The current study presents a comprehensive accuracy analysis on the computer assisted placement accuracy of acetabular cups. Read More

Orthopedics 2007 Oct;30(10 Suppl):S153-6

Department of Orthopaedic and Trauma Surgery, Lukas Krankenhaus, Biinde, Germany.

Intraoperative registration of the anterior pelvic plane is necessary for navigation during total hip arthroplasty (THA). Ultrasound referencing of bony landmarks was implemented in a THA navigation system (OrthoPilot, B. Braun Aesculap; Tuttlingen, Germany) as an alternative to pointer palpation. Read More

Gait Posture 2007 Oct 8;26(4):560-71. Epub 2007 Feb 8.

Movement Analysis Laboratory, Istituti Ortopedici Rizzoli, Via di Barbiano 1/10, 40136 Bologna, Italy.

Human movement analysis still suffers from the weakness of the currently used protocols for data collection and reduction. Reliable data comparisons and precise functional assessment require anatomically based definitions of the reference axes and frames, and therefore careful identification and tracking of the landmarks. When impaired children are analysed, the marker-set and other measurement procedures have to be minimised to reduce the time of the experiment and ensure patient collaboration. Read More

Comput Aided Surg 2005 Sep-Nov;10(5-6):329-36

Department of Orthopaedic Surgery, Inselspital.

Using a total of 30 cadaveric hips, the accuracy of a fluoroscopy-based computer navigation system for cup placement in total hip arthroplasty (THA) was investigated and an error analysis was carried out. The accuracy of placing the acetabular component within a predefined safe zone using computer guidance was compared to the precision that could be achieved with a freehand approach. Accurate control measurements of the implanted cup were obtained using fiducial-based matching to a pre-operative CT scan with respect to the anterior pelvic plane. Read More

Comput Aided Surg 2004 ;9(3):59-69

Maurice E. Müller Research Center for Orthopaedic Surgery, Institute for Surgical Technology and Biomechanics University of Bern Switzerland.

Objective: A simulator was developed to mimic commercial CAS systems in implementing most tasks required to carry out a surgical operation. As tracking systems are generally expensive components, an alternative solution based on low-cost video-based tracking was used. Video tracking accuracy was assessed to determine whether or not this kind of approach was suitable for use in the training domain. Read More

Injury 2004 Jun;35 Suppl 1:S-A90-5

BG Trauma Center Ludwigshafen, 67071 Ludwigshafen/Rhein, Germany.

After experimental and preclinical evaluation of a CT-free image guided surgical navigation system for acetabular cup placement, the system was introduced into clinical routine. The computation of the angular orientation of the cup is based on reference coordinates from the anterior pelvic plane concept. A hybrid strategy for pelvic landmark acquisition has been introduced, involving percutaneous pointer-based digitization with the noninvasive bi-planar landmark reconstruction using multiple registered fluoroscopy images. Read More

Acta Vet Hung 2004 ;52(2):245-52

Department of Surgery, Faculty of Veterinary Medicine, University of Adnan Menderes, 09016 Aydin, Turkey.

In this study, inclination angle of the femoral head and neck was measured on 484 limbs of 242 dogs belonging to 7 breeds, examined for hip dysplasia. These inclination angles were compared according to age, sex and joint laxity, evaluated with Subluxation Index (SI) and Norberg angle (NA) results. The findings indicate that (a) there was a minimal (nonsignificant) difference in femoral inclination angle between the dysplastic and nondysplastic dogs belonging to 7 breeds; (b) although there was no significant difference in femoral inclination angle between the nondysplastic dogs belonging to 4 breeds (Pointer, Irish Setter, Golden Retriever and German Shepherd), a significant difference was observed between Doberman and Labrador, and between Anatolian Karabash and the other six breeds (p < 0. Read More

Unfallchirurg 2003 Nov;106(11):929-34

Klinik für Unfall- und Wiederherstellungschirurgie, BG-Unfallklinik, Ludwigshafen.

After experimental and preclinical evaluation (HAP Paul Award 2001) of the CT-free image-guided surgical navigation system for acetabular cup placement (SurgiGATE C-arm cup" by Medivision, Switzerland), the system was introduced into clinical routine. The computation of the angular orientation of the cup is based on reference coordinates from the anterior pelvic plane concept. A hybrid strategy for pelvic landmark acquisition has been introduced involving percutaneous pointer-based digitization with the noninvasive biplanar landmark reconstruction using multiple registered fluoroscopy images. Read More

Int Orthop 2003 ;27 Suppl 1:S43-6

BG Trauma Center Ludwigshafen, University of Heidelberg, Germany.

After experimental and preclinical evaluation (HAP Paul Award 2001) of a CT-free image-guided surgical navigation system for acetabular cup placement, the system was introduced into clinical routine. The computation of the angular orientation of the cup is based on reference coordinates from the anterior pelvic plane (APP) concept. A hybrid strategy for pelvic landmark acquisition has been introduced involving percutaneous pointer-based digitization with the noninvasive biplanar landmark reconstruction using multiple registered fluoroscopy images. Read More

Clin Orthop Relat Res 2002 Dec(405):287-93

Orthopaedic Department, St. Maartenskliniek Nijmegen, The Netherlands.

An in vitro study was done to test the accuracy and functionality of computer-assisted surgery in pelvic orthopaedic surgery. The study was done on two fresh hips from one cadaver. In each hip, 10 titanium marker screws were inserted through standard pelvic osteotomy incisions. Read More

Arch Phys Med Rehabil 2002 Nov;83(11):1597-602

Center for Rehabilitation Technology, Helen Hayes Hospital, West Haverstraw, NY, USA.

Objective: To develop a valid noninvasive means to measure pelvic tilt and hip angle in seated posture.

Design: Validation cohort study using radiographs as a criterion standard for pelvic posture.

Setting: Rehabilitation hospital. Read More

Obes Res 2000 Jul;8(4):294-301

Division of Biostatistics, Washington University School of Medicine, St. Louis, Missouri 63110-1093, USA.

Objective: Considering that waist-to-hip ratio (WHR) is a simple anthropometric measure of obesity and is a better predictor of coronary heart disease than body mass index (BMI), the genetic underpinnings of WHR are of interest. The inheritance pattern of WHR, before and after adjustment for BMI (WHR-BMI), was investigated in 2713 individuals from 1038 nuclear families in the National Heart, Lung, and Blood Institute Family Heart Study (NHLBI-FHS).

Research Methods And Procedures: Waist and hip measurements were taken twice, and the means of the measurements were used to calculate the WHR. Read More

Injury 1998 Sep;29(7):539-41

Department of Orthopaedics and Trauma, Ipswich Hospital N.H.S. Trust, Suffolk, UK.

A simple laser pointer can be used to guide the radiographer to position the image intensifier during the insertion of a dynamic hip screw in the treatment of fractures of the trochanteric area of the proximal femur. This significantly reduces the screening time and, by implication, the amount of radiation for the theatre staff and patient. Read More

Med J Aust 1998 Dec 7-21;169(11-12):670

Biomed Tech (Berl) 1993 Jun;38(6):139-43

Klinik für Orthopädie, Philipps-Universität Marburg.

In order to describe the lines of action of muscles acting on joints, data on the geometrical position of insertions and origins are needed. These are of fundamental relevance for the biomechanical analysis, in particular for the calculation of joint loading. A measuring device with an accuracy of 0. Read More

Ann Rheum Dis 1991 Oct;50(10):722-3

Department of Orthopaedic Surgery, St Bartholomew's Hospital, London.

Four patients with osteoarthritis of the hip, who developed septic arthritis of the affected joint, are reported. The septic arthritis developed insidiously and was diagnosed with difficulty. One patient died, two required subsequent joint excision, and one arthrodesis despite antibiotics. Read More

J Am Vet Med Assoc 1985 Oct;187(8):805-9

From 1974 through 1984, the Orthopedic Foundation for Animals evaluated 143,218 radiographic submissions representing 151 breeds of dogs. All breeds from which there were 35 or more evaluations had some frequency of dysplasia. Seventy breeds, each with over 100 submissions, were tabulated and ranked according to frequency of hip dysplasia. Read More

Phys Sportsmed 1983 Dec;11(12):123

J Bone Joint Surg Am 1983 Apr;65(4):444-6

Nine of thirteen adolescent patients with a diagnosis of a so-called hip-pointer injury demonstrated a discontinuity of the anterior part of the iliac apophysis on radiographs. Eight of the nine patients improved with conservative treatment and there was total resolution of symptoms in one to eight months. The remaining patient, who was skeletally mature at the time of writing, continued to have recurrent symptoms of discomfort over the iliac crest during athletic activity. Read More

Berl Munch Tierarztl Wochenschr 1977 Nov;90(21):409-14

J Sports Med 1975 Jul-Aug;3(4):192-3

Calif Med 1967 Jun;106(6):450