Clinical biomechanics
-
Clinical biomechanics · Nov 2013
Mechanical behavior of fixation components for periprosthetic fracture surgery.
Reliable periprosthetic fracture treatment needs detailed knowledge on the mechanical behavior of the fixation components used. The holding capacity of three conventional fixation components for periprosthetic fracture treatment was systematically investigated under different loading directions. ⋯ Fixation components may be combined according to their individual advantages to achieve an optimal periprosthetic fracture fixation.
-
Clinical biomechanics · Oct 2013
Comparative Study Controlled Clinical TrialBiomechanical properties of the glenohumeral joint capsule in hemiplegic shoulder pain.
Although many hemiplegic shoulder patients have been suffering from limited range of motion, it is not fully established whether the pathologic biomechanics are same in hemiplegic shoulder pain and adhesive capsulitis. Therefore we aimed to investigate biomechanical properties of glenohumeral joint capsules of hemiplegic shoulder pain with limited range of motions. ⋯ The stiffness of glenohumeral joint capsules in hemiplegic shoulder pain and adhesive capsulitis patients was substantially higher than that in controls, suggesting that hemiplegic shoulder pain patients had stiffer capsules as adhesive capsulitis patients did although the severities were different. This finding implicates that hemiplegic shoulder pain may share common pathologic properties of tighter capsules with adhesive capsulitis. However, there may be additional mechanisms contributing to range of motion limitation in hemiplegic shoulder pain because capsular stiffness in those patients was not as severe as that in adhesive capsulitis patients with similar range of motion limitation.
-
Clinical biomechanics · Oct 2013
Controlled Clinical TrialDo people with recurrent back pain constrain spinal motion during seated horizontal and downward reaching?
Although the effect of symptomatic back pain on functional movement has been investigated, changes to spinal movement patterns in essentially pain-free people with a history of recurrent back pain are largely unreported. Reaching activities, important for everyday and occupational function, often present problems to such people, but have not been considered in this population. The purpose of this study was to compare the amplitude and timing of spinal and hip motions during two, seated reaching activities in people with and without a history of recurrent low back pain (RLBP). ⋯ Subjects with a history of RLBP show a number of altered kinematic features during reaching activities which are not related to the presence or intensity of pain, but which suggest adaptive changes to movement control.
-
Clinical biomechanics · Oct 2013
Does a trochanteric lag screw improve fixation of vertically oriented femoral neck fractures? A biomechanical analysis in cadaveric bone.
We assessed the biomechanical performances of a trochanteric lag screw construct and a traditional inverted triangle construct in the treatment of simulated Pauwels type 3 femoral neck fractures. ⋯ A trochanteric lag screw construct applied to vertically oriented femoral neck fractures provides marked improvement in mechanical performance compared with the inverted triangle construct.
-
Clinical biomechanics · Aug 2013
A numerical study to analyse the risk for pressure ulcer development on a spine board.
Spine boards are used to immobilise accident victims suspected of having spinal injury. Guidelines about the maximum time patients remain on the board are often exceeded and on occasions may lead to pressure ulcers. Etiological research has shown that two processes ultimately lead to pressure ulcers:"Ischemic damage" which takes several hours to initiate and "deformation damage" at high strains. The latter process is very quick and the first signs of cell damage are already evident within minutes. Thus in order to minimise the risk of pressure ulcer development during prolonged loading, a new soft-layered long spine board has been designed. ⋯ The prototype comfort board is able to reduce the risk for deformation damage and thus reduces the risk of developing pressure ulcers.