Enhancement of Pedicle Screw Fixation Through Washers

Shepard, Michael F.; Wang, Jeffrey C.; Oshtory, Rayshad; Yoo, Jung U.; Kabo, J. Michael

doi:10.1097/00003086-200202000-00030

“…Washers were added to the lag screws to prevent the screw head from impacting the soft bone of the humeral tubercle. 18 In the horse in which lag screws alone were used, all 3 screws bent during recovery from general anesthesia, and the distal screw had signs of loosening during a recheck examination 3.5 months after surgery. In the horse in which lag screws were used in conjunction with tension-band wires, none of the implants bent, but there was evidence of screw loosening during a recheck examination 3 months after surgery.…”

Section: Discussionmentioning

confidence: 99%

Fractures of the greater tubercle of the humerus in horses: 15 cases (1986–2004)

Mez

¹

,

Dabareiner²,

Cole³

et al. 2007

javma

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“…One cancellous screw was used in this case as a cortical screw long enough to engage both the near and far cortices was not available. A washer was added to each screw to prevent the head from pulling through the fragment during screw tightening (Shepard et al . 2002).…”

Section: Discussionmentioning

confidence: 99%

“…One cancellous screw was used in this case as a cortical screw long enough to engage both the near and far cortices was not available. A washer was added to each screw to prevent the head from pulling through the fragment during screw tightening (Shepard et al 2002). It was felt that this repair would counteract the distractive forces of the musculotendinous insertions on the fragment providing stability and compression.…”

Section: Fig 4: Cranioproximal-craniodistal Oblique Radiograph 6 Weekmentioning

confidence: 99%

Placement of bone screws in a standing horse for treatment of a fracture of the greater tubercle of the humerus

Madron

¹

,

Caston

²

,

Kersh

³

2012

Equine Veterinary Education

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SummaryA mature Thoroughbred gelding that was used as a high level jumper presented for evaluation of a nonweightbearing forelimb lameness following a fall. Radiographs revealed a complete, noncomminuted, minimally displaced sagittal fracture of the greater tubercle. Supporting limb laminitis was a major concern in the short term based on the severe lameness at presentation. Open reduction with internal fixation was chosen over stall rest in an attempt to more rapidly return the weightbearing function to the limb. The procedure was performed standing and 3 bone screws were placed standing in an attempt to avoid implant or catastrophic bone failure that can accompany recovery from general anaesthesia. The day following surgery the lameness was significantly improved as the horse was able to bear some weight on the heel. The gelding was discharged 5 days following surgery and was fully weightbearing at the walk. Six months following surgery the horse was free of lameness and resumed training. This report describes our experience and rationale in placing bone screws in a standing horse for treatment of a greater tubercle fracture.

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“…It is best to combine visualisation of screws with another diagnostic or therapeutic procedures, e.g., spinal probe or caudal epidural injections (Figs. 4,5,6] Measures to reduce screw loosening Improving screw-bone bonding was the target for many studies [13,16,31,32,34,39,42,45,48,49]. The most successful among these was the use of plasma-sprayed HA screws [13,16,32,34,45,49].…”

Section: Current Practice For the Diagnosis At Our Spinal Unitmentioning

confidence: 99%