Twenty four cases of fracture of the proximal femoral shaft treated with dynamic hip screw fixation are included. All had severe comminution with subtrochanteric extensions. Dynamic hip screw provided stable osteosynthesis and helped to achieve bone union within 18 weeks in 19 of 21 followed-up cases. The anatomical configuration of the femur was maintained with minimal limb length discrepancy ...

The paper begins with a review of screw algebra including dual numbers, unit line vectors, dual vectors, screws, line coordinates, and screw coordinates and summarizes the essential rules of operation for screw algebra. A significant advantage of the algebra is that geometric, kinematic, and dynamic equations of a rigid body can be expressed in a concise and compact form. Several physical quant...

OBJECTIVE In pedicle screw fixation, the heads of monoaxial screws need to be directed in the same straight line to accommodate the rod placement by backing out during operation, which decreases the insertional torque and internal fixation strength. While polyaxial screws facilitate the assembly of the connecting rod, but its ball-in-cup locking mechanism reduces the static compressive bending ...

statement of problem: condylar hyperplasia of the mandible is a self limiting abnormality which can cause facial asymmetry, temporomandibular joint (tmj) dysfunction and esthetic problems. treatment planning is based on the results of isotope scanning, clinical findings and patient age. single photon emission tomography (spect) is considered to be a sensitive method in the calculation of condyl...

Several articles have been written on the use of intraoral vertical subcondylar or inverted “L” osteotomies. le4 Although these procedures have been popular with surgeons to set the mandible back, a disadvantage is the necessary use of maxillomandibular fixation for 6 to 12 weeks. Paulus and Steinhauser’ have described lag screw fixation of vertical subcondylar osteotomies. However, they noted ...

A 30-year-old patient sustained the fracture in a motorcycle accident. A triplane-type of fracture of the distal femur was confirmed by CT scan. The trochlear fragment was reduced anatomically and was stabilized with 6.5mm cannulated screws. Once reconstruction of the coronal plane fracture was performed, the split lateral condylar fragment was fixed with a cannulated screw to the medial fragme...

In this study changes in intercondylar width (ICW) and intercondylar angle (ICA) that occurred with rigid fixation after bilateral sagittal split osteotomy and mandibular advancement are documented and correlated with temporomandibular (TM) symptoms, magnitude of advancement, and mandibular shape. Even though individual changes occurred, there was no significant difference between the mean preo...

BACKGROUNDS The main problem with intraoral distraction of the mandible is the inability to achieve the three-dimensional mandibular correction as planned preoperatively. We developed a technique that allows spontaneous changes in the direction of mandibular elongation using an intraoral distractor. METHODS After mandibular osteotomy, the distractor is fixed to the distal segment of the mandi...

STUDY DESIGN This study is a systematic review of published biomechanical studies involving pedicle screw-based posterior dynamic stabilization devices (PDS) with a special focus on kinematics and load transmission through the functional spine unit (FSU). METHODS A literature search was performed via the PubMed online database from 1990 to 2008 using the following key words: "biomechanics," "...

Objectives: To compare the outcome of DHS (dynamic hip screw) vs cannulated screws in managing fracture neck femur. Study Design: Randomized controlled trial. Duration: 22-06-2021 to 21-12-2021 (6 months) Settings: Department Orthopedic, D.G Khan Hospital, Khan. Materials & Methods: A total 60 patients with fresh femur, 18 years age both genders were included. The DCS group was managed by i...