This study investigated the effects of hyperbaric oxygen (HBO2) therapy following partial arthroscopic meniscectomy surgery on swelling, perceived pain, range of motion at the knee joint, isokinetic strength, and leg function. Subjects were 8 males and 1 female with an acute tear to the meniscus. Subjects were randomly assigned to either a control group (n = 5) or an HBO2 treatment group (n = 5). The HBO 2 group received 5 HBO2 treatments at 2.5 ATA for 90 minutes at 95% O2 beginning 24 hours post-operation. Both groups were tested pre-operation (day 0) and on days 1, 2, 3, 4, 5, 20, 35, and 50 post-surgery. No significant difference was found between groups for any of the dependant variables. The results indicated that the control and HBO2 groups responded in a similar pattern when assessed for swelling, perceived pain, range of motion at the knee joint, leg function and isokinetic strength.

Thesis (Ph.D.)--University of Western Australia, 2004.

No description available.

Thigh muscle strength and endurance were measured following partial arthroscopic meniscectomy of the knee in 24 patients divided into group 1 (age < 20 yr), group 2 (age 24-40 yr), and group 3 (age > 50 yr). Subjects were studied during and after release from isokinetic rehabilitation. Isokinetic testing was performed at 1.04, 2.09, 3.14, 4.19, and 5.24 radians/second, with release from rehabilitation when quadriceps strength achieved 85% recovery of the non-surgical leg.No significant difference existed among the 3 groups in days from the time of surgery to the start of the first test or for the weeks to release from rehabilitation. Approximately 50% quadricep muscle strength loss was observed at the time of the initial isokinetic test. Quadriceps torque (mean + SE) measured in newton-meters for group 1 at the 1.04 rad/sec speed showed the surgical leg significantly weaker (P<0.001) than the non-surgical leg when tested at the initial test (101.6 +18.2 vs. 189.6 +17.2) and at release from rehabilitation (157.4 +13.3 vs. 176.3 +15.2). Torque measured at the other 4 speeds reached non-significance by the second or third week of rehabilitation. Isokinetic testing for groups 2 and 3 showed surgical leg strength significantly weaker (P<0.05) at the initial test and at week 1 of rehabilitation for the 5 testing speeds, with 85% return of strength by weeks 2 or 3. Strength recovery for all 3 groups showed no significant weakness between legs for hamstring torque after the initial or after the first week of rehabilitation. Percent of knee extensor torque achieved by the knee flexor muscles of the surgical leg for the 3 groups showed significantly greater (P<0.001) values only for the initial test at speeds 1.04 and 2.09 rad/sec. Measures of total work, average power, and endurance calculated from work tests showed little change in muscle endurance between legs.These data indicate that quadricep muscle function is negatively affected following arthroscopic meniscectomy. Release from rehabilitation when surgical to non-surgical leg strength is between 85% to 90X appears to be a valid measure for most patients, which indicates age alone does not appear to be a limiting factor in regaining strength.

Author: Bc. Aneta Vránová Title: Changes of rheological properties during various degrees of knee flexion Aim of the thesis: To find out if there is a difference in rheological properties in varoius degrees of flexion in the knee with meniscal tear and compare the results with measurement after physical aktivity. To compare changes of the reological properties of patients who have undegone meniscectomy a few years ago with patients with recent meniscectomy. Method: Experimental measurements were done by using the method of biorheometry which detects the passive resistance of the knee in movement from flexion to extension. Patients completed case history and a special questionnaire relevant to clinical changes connected to meniscal tear. Measuring data were evaluated and converted in the form of biorheogramme. We measured 6 persons. At first were done measurements in three different sequences for both lower extremities, the same measurement was repeated after the physical activity (50 squats). Results: We found changes of rheological properties in higher degrees of knee flexion with typical rising followed by fall of biorheogramme around flexion of 80ř. They were more remarkable after physical activity. Changes of rheological properies were more expressive in patients who have undergone meniscectomy...

[Truncated abstract] Previous research has found that full recovery of knee function following arthroscopic partial meniscectomy (APM) is often not achieved, and in the long-term, over 50% of these patients will develop knee osteoarthritis (OA). Mechanical factors are believed to contribute largely to the development of knee OA. High frequency loading has been shown to lead to degenerative joint changes in animal models. In human gait, the knee adduction moment during stance phase, which tends to load the medial articular surface of the tibiofemoral joint, has been associated with the presence, severity and progression of knee OA. Quadriceps weakness, which is common in people with knee pathology, has been associated with abnormal sagittal plane knee moments during gait, yet no studies have investigated the effect of knee strength on frontal plane kinetics. This work aimed to investigate gait mechanics in a post-APM population, determine the influence of neuromuscular factors on gait, and assess recovery of function over 12 months while examining factors associated with recovery. One hundred and six APM subjects were examined between one and three months postsurgery. Data were compared to an age-matched control group of 49 healthy adults. Subjects were aged 20 to 50 years and had been screened for: clinical and radiographic evidence of knee OA; previous or current knee joint disease or injury (other than the current meniscus pathology); or any other previous or existing disease or injury that may have an effect on gait, or predispose to joint disease. Three-dimensional gait analysis was performed at a freely-chosen walking velocity, using a 50 Hz VICON three-dimensional motion analysis system, instrumented with two force platforms and 10-channel electromyography system. Subjects also underwent knee strength testing on a Biodex isokinetic dynamometer. Information was collected regarding subject’s physical activity levels, general health and knee function, as well as patient’s surgery specifics and rehabilitation regime.

Thesis (M.S.)--University of Michigan, 1954.

Através da meniscectomia no lado esquerdo, seguida ou não de enxerto, objetiva-se verificar as possíveis alterações nas superfícies articulares da ATM. Os animais formaram os grupos: GI (meniscectomia); GII (meniscectomia e enxerto); GIII (somente o acesso cirúrgico) que originaram subgrupos conforme o período pós-operatório (10 e 30 dias) e lado (direito e esquerdo). Nos animais GIII, GId, GIId, a Cm e a superfície articular da fossa mandibular (Fm) estavam organizadas em camadas com o predomínio de fibras colágenas do tipo I. Alterações morfológicas como erosão da Cm e Fm e amplos cistos subcondrais no osso subjacente foram verificadas nos animais GIe e GIIe. Em GIIe, a Cm apresentou um nível razoável de organização sob o enxerto. Fibras colágenas do tipo I constituíam as camadas articular e condroblástica nos animais GIe e GIIe e fibras do tipo III predominaram na camada pré-condroblástica. Amplos espaços vasculares eram evidentes na zona bilaminar dos animais GI e GII. / The morphological features of the temporomandibular joint (TMJ) of rats were studied after meniscectomy in the left side of the joint. The specimens were submitted or not to an interpositional auricular cartilage graft. The animals formed the following groups: GI (meniscectomy); GII (meniscectomy and graft); GIII (sham). The post-operative periods (10, 30 days) and the side allowed to form the subgroups. The articular surface of the TMJ exhibited organized layers (GIII, GId, GIId groups) where the type I collagen fibers arranged in regular nets prevailed. Morphological changes as erosion of the articular surface with large subchondral cysts in the subjacent bone were verified (GIe, GIIe). The condyle\'s surface of GII was regular and structurally preserved under the graft. The type I collagen fibers constituted the articular and chondroblastic layers in the GIe and GIIe animals where the type III collagen fibers were predominant in the prechondroblastic layer. Wide vascular spaces were evident in the bilaminar zone of the GI and GII animals.

Através da meniscectomia no lado esquerdo, seguida ou não de enxerto, objetiva-se verificar as possíveis alterações nas superfícies articulares da ATM. Os animais formaram os grupos: GI (meniscectomia); GII (meniscectomia e enxerto); GIII (somente o acesso cirúrgico) que originaram subgrupos conforme o período pós-operatório (10 e 30 dias) e lado (direito e esquerdo). Nos animais GIII, GId, GIId, a Cm e a superfície articular da fossa mandibular (Fm) estavam organizadas em camadas com o predomínio de fibras colágenas do tipo I. Alterações morfológicas como erosão da Cm e Fm e amplos cistos subcondrais no osso subjacente foram verificadas nos animais GIe e GIIe. Em GIIe, a Cm apresentou um nível razoável de organização sob o enxerto. Fibras colágenas do tipo I constituíam as camadas articular e condroblástica nos animais GIe e GIIe e fibras do tipo III predominaram na camada pré-condroblástica. Amplos espaços vasculares eram evidentes na zona bilaminar dos animais GI e GII. / The morphological features of the temporomandibular joint (TMJ) of rats were studied after meniscectomy in the left side of the joint. The specimens were submitted or not to an interpositional auricular cartilage graft. The animals formed the following groups: GI (meniscectomy); GII (meniscectomy and graft); GIII (sham). The post-operative periods (10, 30 days) and the side allowed to form the subgroups. The articular surface of the TMJ exhibited organized layers (GIII, GId, GIId groups) where the type I collagen fibers arranged in regular nets prevailed. Morphological changes as erosion of the articular surface with large subchondral cysts in the subjacent bone were verified (GIe, GIIe). The condyle\'s surface of GII was regular and structurally preserved under the graft. The type I collagen fibers constituted the articular and chondroblastic layers in the GIe and GIIe animals where the type III collagen fibers were predominant in the prechondroblastic layer. Wide vascular spaces were evident in the bilaminar zone of the GI and GII animals.