Search PubMed⌕ Search

SEARCH · Search PubMed

Results for “Knee Dislocation”

Search indexed PubMed citations on genomics, clinical trials, systematic reviews and public health. Explore titles, authors and supplied subject terms, then open the PubMed record.

Quote a phrase for an exact phrase match. Source license links do not imply unrestricted reuse.

At least 595 records · Page 33Linked to original sources
PubMed1986

[Complications following total knee replacement].

Complications of total knee replacement were studied by following up 218 cases operated in our clinic. The average follow-up time ranged from 24 months to 101 months (mean 44.3 months). The three most serious types of complication were: significant loosening in 8 knees; deep infection in 5 knees; and fracture in 7 knees. Patellar dislocation and extension mechanism rupture were found in 13 knees, restriction of ROM and instability in 20 knees, and other complications in 7 knees. The incidence of complications in the rheumatic group tended to be greater than that in the osteoarthritic group. The incidence of complications was significantly higher in the severely deteriorated group than in the not severely deteriorated group; and the incidence of complications in the group treated in combination with Anametric, Total Condylar and GUEPAR prosthesis was also significantly higher than in the group treated with the Kinematic Knee Prosthesis. Though 32 reoperations were performed in 23 knees, functional prognosis was not good in most cases.

Adult↗
PubMed2003

Dislocation of rotating hinge total knee prostheses. A biomechanical analysis.

BACKGROUND: Symptomatic instability and implant dislocation are occasionally encountered in patients with a rotating hinge total knee prosthesis. A biomechanical study of rotating hinge total knee implants was performed to determine the association between the design (length and taper) of the central rotational stem and the stability of the implant. METHODS: The stem lengths and tapers of knee implants made by seven manufacturers were measured. The tilting laxity of each design was tested by measuring the degree of tilting of the central rotational stem within the tibial housing that occurred with increasing amounts of distraction. The maximum amount of distraction that was possible before the stem dislocated was determined for each design. RESULTS: Implant designs with a short and/or markedly tapered central rotational stem had the greatest tilting, laxity, and instability of that stem. The Howmedica, Techmedica, Intermedics/Sulzer Medica, and Wright Medical Technology/ Dow Corning Wright designs required > or = 39 mm of distraction before they dislocated. The Biomet knee implant required 33 or 44 mm of distraction to dislocate, depending on the thickness of the polyethylene tray that was utilized. The S-ROM knee required only 26 mm of distraction before dislocation occurred. CONCLUSIONS: The measurements confirmed that the shorter the stem and the greater its taper, the greater the instability and laxity at any given amount of joint distraction.

Biomechanical Phenomena↗
PubMed1975

The incidence and pattern of knee injury associated with dislocation of the hip.

A retrospective survey of 135 posterior dislocations and fracture-dislocations of the hip was carried out in order to define the pattern of associated knee injuries. Thirty-five patients had sustained a significant injury to the knee, of which twenty-five were clearly attributable to a direct blow on the front of the knee (fractured patella, traumatic chondromalacia, fractures of femoral and tibial condyles) and ten were compatible with valgus, varus or rotational forces (medial, lateral and cruciate ligament tears). The second type of injury has not been widely recognised but it is important that it should not be overlooked.

Adolescent↗
PubMed1983

Isokinetic knee extension strength and pain before and after correction of recurrent patellar dislocation.

The maximal isokinetic knee extension strength was measured in 20 patients before and after surgical correction of recurrent dislocations of the patella and the pain evoked during the recordings was rated. The preoperative muscle strength was significantly higher and pain was less severe than in a previously studied group of patients with chondromalacia or patellofemoral osteoarthrosis. Twenty months after patella realignment by a new surgical procedure including an extensive lateral release and anteromedial displacement of the tibial tuberosity by an oblique osteotomy through the anterior crest of the tibia, a significant decrease of patellofemoral pain and a slight increase of muscle strength was noted.

Adolescent↗
PubMed2000

Treatment of combined anterior cruciate ligament-posterior cruciate ligament-lateral side injuries of the knee.

ACL-PCL-posterolateral corner injuries most frequently are seen in multiple trauma patients but do occur in the athletic injury population. Acute three-ligament-injured knees may have been tibiofemoral dislocations with spontaneous reduction in the field. Careful documentation of the neurovascular status is essential in these cases to avoid the complications associated with limb ischemia. Systematic evaluation of these patients with history, physical examination, imaging studies, examination under anesthesia, and diagnostic arthroscopy will aid in the correct diagnosis and treatment plan formulation. Arthroscopically assisted, combined ACL-PCL-posterolateral complex reconstructions, using strong graft material, and performed in a timely fashion, have provided consistent and predictable results with few complications.

Anterior Cruciate Ligament↗
PubMed2006

[Dislocation and fractures around the knee with popliteal artery injury: A retrospective analysis of 54 cases].

A retrospective multicentric series of 54 cases of knee trauma with acute ischemia by popliteal artery injury were analyzed. These high-energy traumas involved 25 dislocations and 29 fractures, 11 involving distal femur, 15 the proximal tibia and 3 a floating knee. There were 45 men and 7 women, mean age 42 years. Thirty-three patients suffered multiple injuries. The knee injury was open in 25 cases and associated with sciatic paralysis in 32. Vascular repair was almost always achieved with bypass surgery. An external fixator was used in 39 patients. Vascular repair was unsuccessful in three cases requiring amputation, all three cases involving fractures. There were also six secondary amputations due to muscle necrosis or septic nonunion. The rate of complete recovery of the sciatic was 25%. The rate of nonunion was 37%, half due to infection. Outcome assessed at at least one year follow-up was moderate with frequent functional sequelae. The analysis of these results and data reported in the literature provided indications for diagnostic and therapeutic propositions.

Adolescent↗
PubMed2002

In vitro evaluation of the resistance to dislocation of a meniscal-bearing total knee prosthesis between 30 degrees and 90 degrees of knee flexion.

An increased incidence of dislocation is the most important potential disadvantage introduced by the use of meniscal-bearing prostheses. The aim of this in vitro study was to measure the resistance to dislocation of a meniscal-bearing total knee arthroplasty in various circumstances and to establish which anatomic structures contribute to bearing stability. The prosthesis was implanted into cadaver knee specimens mounted in a 6 df rig. Dislocation was provoked by applying anteriorly or posteriorly directed forces (20-100N) to the tibia in the plane of the tibial plateau. Dislocation was defined as any stable displacement of the bearing (relative to the tibia or the femur) that persisted after release of the load applied to provoke it. The specimens were tested in an arc of knee flexion between 30 degrees and 90 degrees, with and without simulated quadriceps loads, with and without abducting and adducting loads, and before and after division of the posterior cruciate ligament and the lateral retinaculum. In the presence of quadriceps load, dislocation could not be provoked. In the absence of quadriceps load, dislocation was not provoked by posteriorly directed force but sometimes was caused by anteriorly directed force. All but 1 of the dislocations were unicompartmental, the lateral compartment proving much less stable than the medial. The tendency toward dislocation increased from 30 degrees to 60 degrees and from 60 degrees to 90 degrees of knee flexion. Adducting moments applied to the knee caused lift-off of the lateral femoral condyle from the bearing and increased the tendency toward dislocation. Abducting moments had the opposite effect. Division of the posterior cruciate ligament had no significant effect. Division of the lateral retinaculum increased the tendency toward dislocation. A femoral component that can be implanted without lateral release is desirable.

Cadaver↗
PubMed1982

An arthroscopic method for lateral release of subluxating or dislocating patella.

Arthroscopically controlled lateral release for subluxating and dislocating patellae was reviewed in 93 knees (79 patients) at an average of 48.7 months follow-up. Of the patients, 92 % reported significant subjective improvement. Eighty-nine per cent of males and 69% of females were rated good or excellent by objective criteria. Failure to maintain good quadriceps muscle strength was the major reason for fair and poor results. Of 14 knees with dislocations, none had a recurrence after surgery. Patellar shaving was not done in any of the knees. The results of lateral release did not correlate with the severity of chondromalacia patellae. Complications and morbidity were significantly reduced by this outpatient procedure. Experience in endoscopic techniques is an important prerequisite. In the properly selected and motivated patient, this procedure offers an effective alternative to major patellar realignment procedures.

Adolescent↗
PubMed1996

External tibial torsion: an underrecognized cause of recurrent patellar dislocation.

Seventeen patients (18 knees) with recurrent patellar dislocation were identified with increased quadriceps angles secondary to excessive isolated external tibial torsion. Traditional realignment procedures attempted in these knees were unsuccessful because of failure to align the biomechanical axis of the extensor mechanism. Derotational osteotomies of the tibia just proximal to the patella tendon insertion were used to reduce the quadriceps angle to within normal limits to improve the biomechanics of the extensor mechanism. Seventeen (94%) knees were available for clinical and subjective followup at an average of 25 months (range, 1-3.2 years). Overall, 13 of the 17 knees were graded as good to excellent (76%). Five of the 17 patients also had well established anterior knee pain in addition to recurrent dislocation and were treated with a combined derotational and Maquet type osteotomy, with 4 patients obtaining a good to excellent result. Knees that subjectively and functionally demonstrated less painful symptoms preoperatively were associated with excellent results. Poor outcomes were associated with knees that were operated on multiple times.

Adolescent↗