ABSTRACT
Quantitative strength analysis of first metatarsophalangeal joint arthrodesis was performed using two fixation techniques: a small 6-hole plate with an interfragmentary screw or two crossed lag screws. Twelve matched-pair fresh-frozen cadaveric specimens (24 trials) were used for direct comparison of each of the two fixation techniques. All joint surfaces were prepared with power conical reamers utilizing a standard technique. The fixation construct was stressed to failure on each specimen using a computer-integrated materials tester. Fixation stiffness defined as force (load) over displacement and point of ultimate failure was evaluated. The six-hole plate and interfragmentary screw fixation method was a statistically stiffer form of fixation (p > .01) and displayed a greater point of ultimate failure (p > .002) under the laboratory conditions.
Subject(s)
Arthrodesis/methods , Bone Plates/standards , Bone Screws/standards , Metatarsophalangeal Joint/surgery , Aged , Aged, 80 and over , Arthrodesis/instrumentation , Biomechanical Phenomena , Cadaver , Female , Humans , Internal Fixators , Male , Matched-Pair Analysis , Metatarsophalangeal Joint/physiopathology , Middle AgedABSTRACT
The purpose of this study was to evaluate the outcome of implant arthroplasty according to subjective, biomechanic, and radiographic parameters over a long period of time. Implants in 40 feet (27 patients) were analyzed at an average follow-up time of 8.25 years and a mean patient age of 63. The results were consistent with the subjective findings of previous studies that demonstrated that most patients were satisfied with the procedure. Ninety-six percent of the patients in this study confirmed they would undergo the procedure a second time. The radiographic results did not demonstrate a high incidence of implant fracture as previously reported. This review suggests that implants can be effective when used with patients who are carefully selected according to age, activity level, and diagnosis.
Subject(s)
Arthroplasty, Replacement , Joint Diseases/surgery , Joint Prosthesis , Metatarsophalangeal Joint/surgery , Silicone Elastomers , Aged , Female , Follow-Up Studies , Humans , Joint Prosthesis/adverse effects , Male , Middle Aged , Patient Satisfaction , Retrospective StudiesABSTRACT
A retrospective evaluation of first metatarsophalangeal joint arthrodesis was performed on nine patients (12 feet) using two fixation techniques: a small compression plate and screws or two crossed lag screws. The joint surfaces were prepared with power conical reamers to allow for joint alignment and subsequent fusion. The average follow-up time was 6.9 months (range, 1.3 to 15 months) and, to date, all feet are successfully fused. No major postoperative complications or removal of internal fixation devices were noted in our retrospective study. This surgical technique was effective and reliable in achieving first metatarsophalangeal joint fusion, and it may serve as an alternative procedure to silicone implant or resection joint arthroplasty.
Subject(s)
Arthrodesis/methods , Hallux Valgus/surgery , Metatarsophalangeal Joint/surgery , Adult , Bone Plates , Bone Screws , Female , Follow-Up Studies , Humans , Male , Middle Aged , Retrospective StudiesABSTRACT
This technique offers the simplicity and convenience of an adjustable reusable ring with the flexibility of a plaster-cornstarch boxing medium to achieve consistently high-quality master casts.
Subject(s)
Dental Impression Technique , Denture, Complete , Polyvinyl Chloride , Polyvinyls , Dental Impression Technique/instrumentationABSTRACT
Two sets of dentures, one with lingualized occlusion and the other with monoplane occlusion, were made for each of 30 edentulous patients. Sixty-seven percent of those people preferred the lingualized occlusal scheme because of improved masticatory ability, comfort, and esthetics.
Subject(s)
Dental Occlusion, Balanced , Denture Design , Denture, Complete , Adult , Aged , Evaluation Studies as Topic , Female , Humans , Male , Middle AgedABSTRACT
(1) Altering clasp design can affect the way forces act on abutment teeth. (2) An RPI clasp design causes less distal displacement of the primary abutment tooth than circumferential clasp arms with a distal rest under the same conditions. (3) Forces applied on a mandibular distal-extension base will have a greater affect on the abutments on the same side of the arch than on crossarch abutments. (4) The influence of changes in clasp design is minimized when the bases are well adapted to the basal seat and fully extended.
