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biology - Carpus In tetrapods, the carpus is the cluster of bones in the hand between the radius and ulna and the metacarpus. The medial surface presents two articular facets; of these, the superior or smaller is flattened of semilunar form, and articulates with the lunate bone; the inferior or larger is concave, forming with the lunate a concavity for the head of the capitate bone. The pisiform articulates with one bone, the triangular. www.biologydaily.com /biology/Carpus   (1958 words)

Capitate bone - Wikipedia, the free encyclopedia The capitate bone is the largest of the carpal bones, and occupies the center of the wrist. The superior surface is round, smooth, and articulates with the lunate bone. The capitate articulates with seven bones: the navicular and lunate proximally, the second, third, and fourth metacarpals distally, the lesser multangular on the radial side, and the hamate on the ulnar side. en.wikipedia.org /wiki/Capitate_bone   (344 words)

Bone Scintigraphy in Kienbock's Disease   (Site not responding. Last check: 2007-11-04) Stage III is associated with increasing wrist stiffness and collapse of the lunate, proximal migration of the capitate and disruption of the carpal architecture. The uptake of the Tc-99m MDP in the lunate is variable. When the carpal bones are involved, the osteoid osteoma usually arises in the medullary spongiosa and the extensive reactive sclerosis is generally absent. www.med.harvard.edu /JPNM/BoneTF/Case1/WriteUp1.html   (515 words)

KORT - Kentucky Orthopedic Rehab Team   (Site not responding. Last check: 2007-11-04) It is the bone that is affected in patients with Kienbock's disease. The length of the ulna, the bone of the forearm on the opposite side of the thumb, may be a factor. The segment is attached to the deteriorating lunate bone. www.kort.com /wrist/wristkien.asp   (1756 words)

II. Osteology. 6b. The Hand. 1. The Carpus. Gray, Henry. 1918. Anatomy of the Human Body.   (Site not responding. Last check: 2007-11-04) 219, 220) is subdivided into three segments: the carpus or wrist bones; the metacarpus or bones of the palm; and the phalanges or bones of the digits. It is situated in the center of the proximal row of the carpus, between the navicular and triangular. It is situated at the medial and lower angle of the carpus, with its base downward, resting on the fourth and fifth metacarpal bones, and its apex directed upward and lateralward. www.bartleby.com /107/54.html   (1866 words)

Orthopaedic - Carpal instability Bone landmarks are recognized (Fig 4): radial and ulnar styloid, Lister’s tubercle, capitate head fossa and proximal to it, the lunate bone. The graft is harvested from the distal radius or from the olecranon. The remaining cartilage of the lunate distal facet and of the proximal capitate are resected with the subchondral bone. www.maitrise-orthop.com /corpusmaitri/orthopaedic/mo73_saffar/index.shtml   (4387 words)

Case Summary: 5627 from the MedPix™ Medical Image Database and Teaching File   (Site not responding. Last check: 2007-11-04) Surgical correction was made and the lunate bone was found lodged in the carpal tunnel. Lunate and perilunate dislocations comprise approximately 10% of all carpal injuries. The unstable lunate characteristically assumes a triangular shape on the PA radiograph. rad.usuhs.mil /medpix/medpix.html?mode=tf_case&pt_id=5627¬hing=   (573 words)

Lunate implant - Patent 4164793 Metallic and acrylic implants for the replacement of carpal bones were not satisfactory due to problems relating to progression of the arthritic process, migration of the implant, breakdown of the material and absorption of bone due to hardness of the material inserted. The lunate bone has a deeply concave and crescent outline and is situated in the center of the proximal row of the carpus. The bone distal surface is deeply concave and articulates with the head of the capitate by a long narrow facet separated by a ridge from the general surface of the hamate bone. www.freepatentsonline.com /4164793.html   (3801 words)

KIENBOCK DISEASE Patients with severe fragmentation of the lunate undergo resection of the necrotic bone, osteotomy of the capitate in its mid portion, and proximal displacement of the proximal capitate fragment, which is secured to the scaphoid and triquetrum with bone pegs. Essentially, the space vacated by excision of the lunate is filled by the proximal half of the capitate fragment, and the space left by osteotomy of the capitate is filled by autogenus bone graft. When the lunate remains suitably intact, osteotomy of the capitate is omitted, as is lunate excision, and the contiguous surface of the lunate, scaphoid, triquetrum, hamate and capitate are arthrodesed. hometown.aol.com.au /Kienbockdisease/myhomepage/health.html   (4286 words)

Kienbock Disease In the literature, various theories on the etiology of the necrosis of the lunate bone (Kienbock's disease) are presented: biomechanical reasons, trauma and lack of arterial blood supply have been reported. As with the scaphoid bone, the lunate bone is under a lot of strain due to its anatomical position in the carpus [Rossak, 1966; Palmer and Wemer, 1981 ]. (2) The dorsal vessels are kinked and wedged between the dorsal surface of the capitate bone and the dorsal rim of the radius. www.kienbock.com /articles/k4.htm   (1798 words)

The vascularity of the lunate bone and Kienb:ock's disease - Wheeless' Textbook of Orthopaedics The vascularity of the lunate bone and Kienb:ock's disease - Wheeless' Textbook of Orthopaedics The vascularity of the lunate bone and Kienb:ock's disease One ot two nutrient vessels were observed entering the dorsal and volar poles of the lunate from both plexuses. www.wheelessonline.com /j4/97.htm   (139 words)

eMedicine - Hand, Fractures and Dislocations: Wrist : Article by Edward E Tredget, MD, MSc, FRCS(C)   (Site not responding. Last check: 2007-11-04) In the palmar direction, the lunate receives branches from (1) the anterior division of the anterior interosseous artery, (2) the palmar carpal branches of the radial and ulnar arteries, and (3) a recurrent branch from the deep palmar arch. Normally, the kidney-shaped lunate holds the head of the capitate with its concave surface and articulates with the distal radius with its proximal convex surface. Bilos ZJ, Hui PW: Dorsal dislocation of the lunate with carpal collapse. www.emedicine.com /plastic/topic318.htm   (9681 words)

Lunate bone   (Site not responding. Last check: 2007-11-04) The lunate bone (os lunatum; semilunar bone) is a bone in the human hand that may be distinguished by its deepconcavity and crescentic outline. It is situated in the center of the proximal row of the carpus, or wrist, between the navicular bone and triangular bone. The lunate articulates with five bones: the radius proximally, capitate and hamate distally, navicular laterally, andtriangular medially. www.therfcc.org /lunate-bone-101734.html   (227 words)

bone scan findings Despite the prolonged history, discrete photopenia on the blood-pool phase and photopenia relative to the remainder of the ipsilateral carpus on the delayed phase of a bone scan in the region of the lunate was shown. Photopenic bone scan abnormalities in early avascular necrosis, particularly in the femoral head, are a wellrecognized phenomenon. Focal, increased blood pool in the region of the lunate was noted in five of the 12 wrists with Kienbock's disease in which bone scintigraphy was performed. www.kienbock.com /articles/scan.htm   (1225 words)

Keinbock’s Disease - DynoMed.com   (Site not responding. Last check: 2007-11-04) When the blood supply to the lunate is inhibited it begins to die.  Sometimes patients have a history of injury prior to developing this condition, although a specific cause-and-effect relationship has not been established between Keinbock’s disease and other injuries to the wrist. In later stages of this condition the lunate bone will fragment and collapse, causing generalized degenerative arthritis of the wrist.  There may be degeneration at surrounding joints, where the lunate meets the scaphoid, triquetal, hamate, and capitate bones. When it is possible to exercise the wrist with gentle, limited motion, your doctor will recommend specific rehabilitation exercises.  He or she may advise you to treat the wrist with heat, using a heating pad, heat lamp, hot soaks, or whirlpool treatments.  Ice massage is also recommended before and after exercising the wrist. www.dynomed.com /encyclopedia/encyclopedia/hand_and_wrist/Keinbock's_Disease.html   (349 words)

Perilunate Dislocation The lunate bone maintains its normal relationship with the radius. This demonstrates the abnormal relationship between the scaphoid and lunate bones. This shows the normal relationship of the lunate relative to the radius but there is dorsal displacement of the capitate bone. www.gentili.net /fracture1.asp?ID=158   (99 words)

VanDemark   (Site not responding. Last check: 2007-11-04) The bone then progresses through a phase of sclerosis (a sort of hardening of the bone), collapse of the bone, and severe collapse with degenerative changes in the wrist joint. Doing this may allow the bone to heal and revascularize - or it may slow the progression of the disease. If the bone is in good alignment, you may be placed in a cast for up to twelve weeks. www.vandemarkortho.com /patient/pated/wrist/wrist_kienbocks_disease.html   (1665 words)

Kienböck's Disease Bone is living tissue that requires a regular supply of blood for nourishment. If the bones of the lower arm are uneven in length, a joint leveling procedure may be recommended. Bones can be made longer with bone grafts, or shortened by removing a section of the bone. orthoinfo.aaos.org /fact/thr_report.cfm?Thread_ID=311&topcategory=Hand&all=all   (692 words)

Imaging Findings in Ulnar-sided Wrist Impaction Syndromes -- Cerezal et al. 22 (1): 105 -- RadioGraphics Coronal T1-weighted (500/15) (a) and corresponding fat-suppressed T2-weighted (3,000/50) (b) MR images clearly depict chondromalacia and marrow edema of the lunate bone (arrows). Subcortical sclerosis is present along the ulnar aspect of the proximal pole of the lunate bone (arrow).   Diagram illustrates hamatolunate impaction syndrome, with Viegas type II lunate bone, chondromalacia of the proximal pole of the hamate bone, subchondral sclerosis, and marrow edema (arrow). radiographics.rsnajnls.org /cgi/content/figsonly/22/1/105   (2703 words)

[No title]   (Site not responding. Last check: 2007-11-04) COMMENT: The signal within the left lunate bone is heterogeneous, and has changed since the study of 23 July 1998. Whereas on the previous study, there are regions of increased signal on proton density and T2 within the lunate, there are now regions of decreased signal on all sequences consistant with sclerosis as well as regions of noremal appearing marrow signal. As on the previous study, ther is fluid in the soft tissues observed lateral to the navicular and trapezium. www.f-tech.net /~gatsby/mri2.HTM   (294 words)

Uggh... ggrrrrrr... brains... brains... Due to an injury or repeated trauma to the wrist, the lunate bone in the wrist is injured and the blood supply to it is cut off. Over time the bone dies, as bone is a living tissue, and needs blood to supply the oxygen necessary for it to live. This is marked by the collapse of the lunate bone, rotation of the bone beneath the thumb, and arthritis in the wrist. www.livejournal.com /users/darci_m   (686 words)

Kienböck's Disease: Hand Disorders: Merck Manual Home Edition Kienböck's disease is the death of bone tissue due to an impaired blood supply (avascular necrosis (see Avascular Necrosis of the Bone) affecting the lunate bone in the hand. Symptoms generally start with wrist pain that begins gradually, in the area of the lunate bone, which is in the middle of the wrist at the base. If the lunate bone has collapsed, the wrist bones may be removed or surgically fused together as a last resort to relieve pain. www.merck.com /mmhe/ag/print/sec05/ch071/ch071g.html   (218 words)

American Society for Surgery of the Hand | Kienbock's Disease   (Site not responding. Last check: 2007-11-04) The surfaces of adjoining bones are affected, resulting in arthritis of the wrist. This procedure uses a bone graft from the inner bone of the lower arm. It may be combined with an external fixator, a metal device that helps relieve pressure on the lunate and preserve the spacing between bones. www.assh.org /Content/NavigationMenu/Patients_and_Public/Kienbocks_Disease/Kienbocks_Disease.htm   (732 words)

Home-n-Stuff.net - Health: Kienbock's Disease   (Site not responding. Last check: 2007-11-04) is "avascular necrosis of the lunate bone", one of the carpal bones in the wrist. In other words, the lunate bone dies (necrosis) as a result of a lack of blood flow (avascular) to the lunate. Gradually, the bone begins to disintegrate and, as it does, the metacarpal bone above it begins to migrate toward the wrist, filling in the empty space left by the decaying lunate. www.home-n-stuff.net /health/kienbocks.html   (154 words)

Kienbock Disease Recurrent pain and stiffness occur in conjunction with thickening, swelling and tenderness in soft tissue overlying the lunate bone. Kienbock Disease is characterized by degenerative changes in the lunate bone of the wrist. The treatment of Kienbock's Disease may involve surgery of the lunate bone, shortening of the radial bone, lengthening of the ulna or the stiffening of the joints through an operation (arthrodesis). hw.healthdialog.com /kbase/nord/nord604.htm   (845 words)

Lunate Chondromalacia: Evaluation of Routine MRI Sequences -- Bordalo-Rodrigues et al. 184 (5): 1464 -- American ... Lunate Chondromalacia: Evaluation of Routine MRI Sequences -- Bordalo-Rodrigues et al. Lunate cartilage defects were seen on MRI in 10 of (n = 2), and radial aspect of the distal lunate bone (n = 1). www.ajronline.org /cgi/content/abstract/184/5/1464   (317 words)

Kienbock's disease - General Practice Notebook   (Site not responding. Last check: 2007-11-04) Kienbock's disease occurs when the lunate bone develops patchy necrosis after acute or chronic injury. In later disease there will be increased bone density of the lunate. Treatment: in early disease an osteotomy of the radius may be performed so as to take pressure off the lunate and prevent bone collapse. www.gpnotebook.co.uk /cache/-1483079671.htm   (190 words)

Orthopaedic - C. Dumontier - Physical examination of wrist instabilities In ulnar deviation, the snap represents the action of the scaphoid on the lunate bone and the sudden correction of the proximal carpal row into dorsiflexion. Another technique to palpate the scapholunate interval is to place the index finger on the dorsal and distal pole of the lunate and then move the index finger radially while moving the wrist in flexion and extension. The proximal carpal row is flexed in Fig 27a as demonstrated by the ring sign of the scaphoid; the lunate with its posterior, small and sharp horn is clearly visible; and the triquetrum is superposed to the hamate. www.maitrise-orthop.com /corpusmaitri/orthopaedic/dumontier_synth/dumontier_us.shtml   (7576 words)

Imaging Findings in Ulnar-sided Wrist Impaction Syndromes -- Cerezal et al. 22 (1): 105 -- RadioGraphics lunate bone, and proximal radial aspect of the triquetral bone the articular surfaces of the ulna, lunate bone, and triquetral the proximal pole of the triquetral bone and the ulnar styloid radiographics.rsnajnls.org /cgi/content/full/22/1/105   (6111 words)

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