– Discussion: – see bone circulation: – blood supply to tibial shaft is dervied from nutrient artery & periosteal vessels; – nutrient artery: – arises from posterior tibial artery as it enters into the posterior tibial cortex, distal to the soleal line at the … Read more
– See: – Anastomosis of lower limb arteries – Arterial supply of the femur – AVN of femoral head; – AVN following femoral neck fracture – Anatomy: – extracapsular arterieal ring at the base of the femoral neck; … Read more
– Discussion: – embolization in pts who have sustained vascular injures from pelvic frx is the most direct means for controling of hemorrhage; – when bleeding originates from major arteries only effective technique is direct approach to the vessels; – embolization avoids the retroperitoneal contamination that … Read more
– Discussion: – blood is supplied to vertebral column by way of segmental arteries that arise near it from the aorta, or from adjacent arteries in areas beyond the extent of the aorta; – costocervical & intercostal arteries in thorax; lumbar and iliolumbar arteries in lumbar region; and lateral sacral … Read more
– Discussion: – problem with standard BKA, the stump is often bulky and there are delays with patellar tendon prosthesis; – when healed the scar crosses the prominent crest of the tibia, which is often the point that broke down with prosthetic use; – note that the BKA prosthesis … Read more
– See: Prosthetic Feet: – PTB sockets: – provide some weight bearing support in the area of patella tendon and medial tibial flare; – BKA Suspension: – important design considerations for both sockets include – support (pressure distribution) – control (based … Read more
– Discussion: (see: necrotizing fascitis ) – human bite wounds – snake bite: – Bacteriology of rattlesnake venom and implications for therapy. – cat bite: (see cat scratch disease) – consider pasteurella multocida; note P. multocida infection develops within 24hrs; – with bites on the finger observe for osteomyelitis; … Read more
– See: – Characteristics of Metals and Implants: – Elastic Strain – Metal Fatigue – Plates – Polyethylene – Screws – Strain – Stress – Ultimate Tensile Strength: … Read more
– See: Biomechanics Menu: – Anatomy of the ACL: – Biomechanics: – ultimate tensile load: 2160 ± 157 N – stiffness: 242 ± 28 N/mm; – passive knee extension produces forces along ACL only during last 10 degrees of knee extension; – hyper-extension: … Read more
– See: Role of Knee Joint During Gait: – Discussion: – patella increases the mechanical advantage of extensor muscles by transmitting forces across knee at greater distance (moment) from axis of rotation; – increases functional lever arm of quads as well as changing direction of pull of quad mechanism; … Read more