– 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
– See: multipartite patella – Discussion: – a common congenital fragmentation or synchondrosis of the patella – occurs in approximately 1% of population but some have observed a much higher incidence; – most remain asymptomatic, but direct trauma may disrupt the synchondroses, causing symtoms that mimic those … 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
– Discussion: – may be accomplished with a large needle or by open surgical methods; – things to consider before biopsy: – has the workup established metastatic dz (most common in patients over 40) vs isolated bone / soft tissue tumor vs infection (osteomyelitis); – studies that may be performed prior to biopsy: … Read more
– See: – Closed Reduction – Gravity Method of Stimson – Discussion: – pt lies supine, & assistant applies countertraction by downward pressure on the ASIS; – surgeon grasps affected limb at ankle w/ one hand, places opposite forearm behind the knee, and applies longitudinal traction in line of deformity; – adducted & internally rotated … Read more
– Anatomy: – origin: – long head: ischial tuberosity and the sacrotuberous ligament; – short head: lateral lip of linea aspera, lateral supracondyle of femur and lateral intermuscular septum; – insertion: – lateral sides of the head of the … Read more
– Discussion: Tibial Plateau Frx Menu – consists of wedge frx of medial & lateral plateau; – if articular depression is present, it is usually present on the lateral plateau; – frx may have an inverted Y appearance, w/ the articular frx originating in the intercondylar region; – associated … Read more
– See: – BKA Prosthesis – Amputations in the Diabetic Patient – Pediatric BKA: – Discussion: – length considerations: – ideal bone length is between 12 to 17 cm as measured from the medial joint line; – in … Read more