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Biomedical subjects

Marnix van Holsbeeck

Publications and source records attributed to Marnix van Holsbeeck.

12 recordsLinked to original sources
PubMed2006

Outcome and structural integrity after arthroscopic rotator cuff repair using 2 rows of fixation: minimum 2-year follow-up.

BACKGROUND: Although arthroscopic repairs of the rotator cuff are becoming increasingly popular, security of fixation remains a concern. Two-row repairs have been described, but clinical outcome reports have primarily involved open techniques. HYPOTHESIS: An arthroscopic repair technique that uses 2 rows of fixation produces satisfactory outcome and structural integrity by ultrasonography. STUDY DESIGN: Case series; Level of evidence, 4. METHODS: Forty-eight patients (52 shoulders) with a full-thickness, but fully reducible, rotator cuff tear who met the inclusion criteria were treated with an arthroscopic rotator cuff repair using 2 rows of suture anchors. The mean tear size was 2.47 cm (range, 1-4 cm). Patients were evaluated by subjective functional assessment (L'Insalata Shoulder Rating Questionnaire), clinical examination, including measured strength testing, and ultrasonography. RESULTS: At a mean follow-up of 30 months (minimum of 2 years), functional scores improved from a mean of 42 preoperatively to 93 postoperatively (P < .001). Active range of motion was increased in all measured planes (P < .001). Strength was also increased in elevation (P < .001), external rotation (P < .001), and internal rotation (P = .033). Nine of the 52 shoulders (17%) had evidence of retear or persistent defect on postoperative ultrasonography. There were no differences detected in functional scores between those with an intact repair and those with a defect, but those with an intact repair were stronger in elevation (P = .006) and external rotation (P = .001). CONCLUSION: An arthroscopic 2-row rotator cuff repair produces excellent functional outcome and repair integrity comparable with previously reported open repairs. Presence of a defect after repair did not appear to affect patient-reported function and return to preinjury activity but did affect measured strength.

Adult↗
PubMed2004

Fury over sound.

Explore the source record for details and available documents.

Humans↗
PubMed2004

Evaluation of shoulder integrity in space: first report of musculoskeletal US on the International Space Station.

Investigative procedures were approved by Henry Ford Human Investigation Committee and NASA Johnson Space Center Committee for Protection of Human Subjects. Informed consent was obtained. Authors evaluated ability of nonphysician crewmember to obtain diagnostic-quality musculoskeletal ultrasonographic (US) data of the shoulder by following a just-in-time training algorithm and using real-time remote guidance aboard the International Space Station (ISS). ISS Expedition-9 crewmembers attended a 2.5-hour didactic and hands-on US training session 4 months before launch. Aboard the ISS, they completed a 1-hour computer-based Onboard Proficiency Enhancement program 7 days before examination. Crewmembers did not receive specific training in shoulder anatomy or shoulder US techniques. Evaluation of astronaut shoulder integrity was done by using a Human Research Facility US system. Crew used special positioning techniques for subject and operator to facilitate US in microgravity environment. Common anatomic reference points aided initial probe placement. Real-time US video of shoulder was transmitted to remote experienced sonologists in Telescience Center at Johnson Space Center. Probe manipulation and equipment adjustments were guided with verbal commands from remote sonologists to astronaut operators to complete rotator cuff evaluation. Comprehensive US of crewmember's shoulder included transverse and longitudinal images of biceps and supraspinatus tendons and articular cartilage surface. Total examination time required to guide astronaut operator to acquire necessary images was approximately 15 minutes. Multiple arm and probe positions were used to acquire dynamic video images that were of excellent quality to allow evaluation of shoulder integrity. Postsession download and analysis of high-fidelity US images collected onboard demonstrated additional anatomic detail that could be used to exclude subtle injury. Musculoskeletal US can be performed in space by minimally trained operators by using remote guidance. This technique can be used to evaluate shoulder integrity in symptomatic crewmembers after strenuous extravehicular activities or to monitor microgravity-associated changes in musculoskeletal anatomy. Just-in-time training, combined with remote experienced physician guidance, may provide a useful approach to complex medical tasks performed by nonexperienced personnel in a variety of remote settings, including current and future space programs.

Humans↗
PubMed2004

Ultrasound for the early diagnosis of clinically suspected scaphoid fracture.

PURPOSE: To test the ability of ultrasound to diagnose clinically suspected occult scaphoid fractures. METHODS: Eighteen wrists in 18 patients with an average age of 35 years (range, 10-77 years) were seen in the emergency room, each with a single traumatic wrist injury, snuffbox tenderness, swelling, and a negative wrist x-ray result. They were evaluated in this prospective, blind, controlled study by physical examination, x-ray, and high-resolution ultrasound. One hand surgeon performed the examination, and ultrasounds were read by a musculoskeletal radiologist. Patients were immobilized in a thumb spica splint and then seen in the office 1 to 14 days after the emergency room visit, at which time a repeat physical examination, wrist x-ray, and the single investigative ultrasound were done using the opposite wrist as a control. All patients were immobilized and evaluated until symptoms resolved or x-ray showed scaphoid fracture site resorption or callus, in which case they were kept immobilized until healed. RESULTS: Ultrasound identified correctly 7 of 9 cases that were eventually positive for scaphoid fracture on plain x-ray. Ultrasound was read correctly as negative in 8 of 9 x-ray-negative cases; this was statistically significant. The 1 false-positive case had radioscaphoid arthrosis and radial wrist swelling. Sensitivity was 78% and specificity was 89%. The positive predictive value was 88% and negative predictive value was 80%. CONCLUSIONS: We recommend that high-frequency ultrasound be used to investigate occult suspected scaphoid fractures because of its ability to allow early diagnosis and to eliminate the need for a more invasive or expensive diagnostic test in most cases.

Adolescent↗
PubMed2003

Ultrasound visualization of central slip injuries of the finger extensor mechanism.

PURPOSE: To evaluate the ability of ultrasound to detect a central tear of the finger extensor tendon mechanism. METHODS: Twelve fresh-frozen and thawed cadaver fingers were used. All fingers had a midradial incision with exposure of the extensor mechanism over the proximal interphalangeal joint. Six fingers had a sharp transection of the central slip. The other 6 fingers were used as sham dissection controls. All fingers had the exposure closed by suture and then were examined by a musculoskeletal ultrasonographer. RESULTS: All 12 fingers were identified correctly as either sham controls with intact central slips or as injury models that had a transected central slip. Thus there was a sensitivity of 100% a specificity of 100%, and a positive predictive value of 1.000, which were statistically significant. CONCLUSIONS: Diagnostic ultrasound is a very accurate noninvasive study that can identify central slip injuries in the extensor mechanism of the finger. We recommend that clinically suspected cases of boutonniere injury be scanned by high-frequency ultrasound to confirm the diagnosis and allow either early initiation of splinting or eliminate the need for prolonged splinting required for this injury.

Finger Injuries↗
PubMed2002

Longitudinal stress fracture: patterns of edema and the importance of the nutrient foramen.

DESIGN AND PATIENTS: We reviewed the MR appearances of six cases of longitudinal stress fracture of the lower extremity. RESULTS: One fracture was in the femur and five were in the tibia. Four of the tibial fractures showed edema starting in the mid-tibia at the level of the nutrient foramen with the fracture on the anteromedial cortex. The other tibial fracture started at the nutrient foramen. Three fractures (two tibial and the femur fracture) showed eccentric marrow edema; all fractures showed either eccentric periosteal reaction or soft tissue edema. CONCLUSION: Primary diagnosis of longitudinal stress fracture is made by finding a vertical cleft on one or more axial images. Secondary signs of position of the nutrient foramen and patterns of edema may be useful.

Adolescent↗
PubMed2002

The utility of MR in assessing Blount disease.

OBJECTIVE: To review the MR appearances of Blount disease. DESIGN AND PATIENTS: The MR examinations of six knees in four patients (ages 6-7 years) with Blount disease were reviewed. RESULTS: All patients showed delay in ossification of the medial tibial epiphysis. A spectrum of changes was seen in and around the tibial growth plate including: widening and depression of the medial growth plate; small and deep intrusions of cartilage into the metaphysis; edema of the medial tibial epiphysis and medial and lateral metaphysis; varus deformity of the lower leg; widening of the lateral growth plate; osteochondral injury to the medial femoral condyle; hypertrophy of the medial meniscus; focal bone bridging. CONCLUSION: MR appearances are consistent with the primary abnormality in Blount disease, which is failure of endochondral ossification of the medial growth plate. MR examination is useful in surgical planning.

Bone Diseases, Developmental↗
PubMed1998

Ultrasound of the Elbow.

Ultrasound is ideally suited for the evaluation of soft tissue lesions of the elbow. The ultrasound study of the elbow is rapid, dynamic and cost-effective. This article presents a brief overview of scanning technique and illustrates some common pathologies.

Journal Article↗
PubMed1998

Ultrasound of the Foot and Ankle.

For specific indications, ultrasound is an inexpensive and efficient alternative to magnetic resonance (MR) imaging of the ankle and foot. In addition to the tendons, the anterior joint, retrocalcaneal bursa, ligaments, plantar fascia, and soft tissues can be imaged with ultrasound. Tenosynovitis, tendon tears and tendinosis, joint effusions, intra-articular loose bodies, ganglion cysts, plantar fasciitis, and Morton neuromas can be demonstrated with ultrasound. In most cases, a focused ankle or foot ultrasound can be performed more rapidly and efficiently than magnetic resonance imaging. Direct correlation with the site of pain and rapid comparison with the asymptomatic ankle are possible with this modality. As pressure for cost containment continues, demand for ultrasound of the ankle and foot will likely increase.

Journal Article↗
PubMedDate not supplied

Evidence of subclinical medial collateral ligament injury and posteromedial impingement in professional baseball players.

BACKGROUND: Recognition and treatment of elbow conditions such as medial collateral ligament injury and posteromedial impingement are increasing in throwing athletes. Magnetic resonance imaging may provide pivotal information in the management of these athletes. Knowledge of the utility of magnetic resonance imaging has become widespread throughout the baseball community. However, data on the frequency and extent of asymptomatic magnetic resonance imaging findings in the elbows of this throwing population are lacking . HYPOTHESIS: Abnormalities in the throwing elbows of asymptomatic professional baseball players compared to the nonthrowing elbows are frequently seen in magnetic resonance images. STUDY DESIGN: Descriptive anatomical study. METHODS: Sixteen asymptomatic professional baseball players with no history of injury underwent bilateral elbow magnetic resonance imaging using a standardized sequencing protocol. The magnetic resonance images were reviewed, in a blinded fashion, by 2 musculoskeletal radiologists and 1 orthopaedic surgeon. RESULTS: Medial collateral ligament abnormalities (including thickening, signal heterogeneity, or discontinuity) were present in 87% of players' dominant elbows. Findings consistent with posteromedial impingement were present in 13 of 16 subjects. There was a significant correlation between medial collateral ligament thickening and posteromedial subchondral sclerosis (P = .04). The throwing elbow was correctly identified in all 16 subjects. No significant correlation between magnetic resonance imaging findings and age could be detected. CONCLUSIONS: This study demonstrates a high rate of abnormal magnetic resonance imaging findings in asymptomatic throwers' elbows. These baseline findings must be considered when magnetic resonance imaging is being used as a factor in treatment decisions.

Adolescent↗