ABSTRACT
A retrospective clinical and radiological analysis was performed on 117 patients (138 hips) with a mean age of 75 years and a mean follow-up of 11 years. The prostheses used were 2 similar monoblock femoral components with 22- and 32-mm head sizes; their effects on the wear of the high-density polyethylene cup were studied. Wear of component was determined by evaluating the standardized initial and follow-up radiographs. The mean rate of linear wear was higher in the 22-mm femoral head, whereas the volumetric wear was higher in the 32-mm femoral head. In both groups, volumetric wear was significantly correlated with cup lysis. Increasing body weight in both groups was associated with more volumetric wear. The radiological evidence of prosthetic loosening did not correlate well with clinical evaluation of the hip.
Subject(s)
Arthroplasty, Replacement, Hip/methods , Bone Cements , Hip Prosthesis , Prosthesis Failure , Aged , Aged, 80 and over , Female , Femur Head , Follow-Up Studies , Humans , Male , Middle Aged , Prosthesis Design , Retrospective Studies , Time FactorsABSTRACT
A prospective study of the bicycle spoke injury over a 1-year period included a total of 71 spoke injuries. Of these, 67 injuries occurred on an adult bicycle and four occurred on a child's bicycle. All children sustained ankle and foot injuries, which consisted of contusion and superficial abrasion (N = 45), skin loss (N = 10), skin laceration (N = 4), and undisplaced fractures (N = 12). A biomechanical study was conducted to investigate the use of a protective cover over the wheel to prevent the foot from slipping between the spokes. Wind resistance studies showed that a cover with a mesh size of 10 mm hexagonal could prevent this and at the same time stop the cover from acting as a sail if a flat cover without holes was used instead. The mesh cover, however, will prevent the toes from entering between the spokes but will not prevent the foot from becoming jammed between the wheel and the fork. To prevent this, a plastic shield to bridge the gap between the fork and the horizontal upright has been designed. With these modifications, the bicycle spoke injury can become an injury of the past.
Subject(s)
Ankle Injuries/prevention & control , Bicycling/injuries , Foot Injuries/prevention & control , Fractures, Bone/prevention & control , Protective Devices , Adolescent , Ankle Injuries/epidemiology , Ankle Injuries/etiology , Child , Child, Preschool , Female , Foot Injuries/epidemiology , Foot Injuries/etiology , Fracture Fixation/methods , Fracture Healing , Fractures, Bone/epidemiology , Fractures, Bone/etiology , Humans , Incidence , Infant , Male , Prognosis , Prospective StudiesABSTRACT
Metatarsophalangeal joint dislocations are unusual in children and usually occur in the hallux. We are reporting a case of irreducible traumatic dislocation of the fifth metatarsophalangeal joint. At open reduction, the metatarsal head was incarcerated under the flexor digitorum longus. After returning the flexor digitorum longus tendon to its anatomical position, the metatarsophalangeal joint reduced and was stable.
