Glossary

Modular necks were introduced in total hip arthroplasty (THA) to improve restoration of hip-geometry and reduce dislocation-rates. This presumed advantage was evaluated retrospectively for patients with arthritis in otherwise anatomically normal hips. Restoration of hip-geometry was assessed on preoperative and postoperative calibrated radiographs in 95 consecutive primary THAs with a modular neck design and compared with 95 match controlled THAs with a similar monoblock stem. No significant differences were seen in restoration of body moment arm, leg length and cupangle. Offset restoration revealed a borderline significant difference (P = 0.48) with higher values for the monoblock stem. In both groups 4 dislocations within one year were encountered. In this study modular necks did not reveal a clear benefit in restoring hip geometry and dislocation rate after straightforward THA

Lumbale herniaoperatie: Endoscopisch of open?

_Achtergrond en het waarom van de studie_ In Nederland vinden jaarlijks veel operaties voor een lumbale discushernia plaats. Patiënten krijgen meestal een open microdiscectomie, waarbij de hernia wordt opgeheven via een klein sneetje in de rug en de zenuwwortel wordt vrijgelegd (figuur a). Een andere techniek is percutane transforaminale endoscopische discectomie (PTED) (figuur b). Hierbij wordt de hernia onder indirect zicht opgeheven door een kleinere snee van 8 mm via het wortelkanaal, dus meer vanaf de zijkant. PTED vindt plaats in dagbehandeling onder lichte sedatie, waardoor de patiënt gedurende de ingreep aanspreekbaar is. Mogelijke voordelen van deze techniek zijn minder risico op littekenvorming en een snellere revalidatie. Een mogelijk nadeel is een groter risico op recidieven omdat er minder discusmateriaal kan worden uitgeruimd. PTED behoort nog niet tot het basispakket, omdat Zorginstituut Nederland meent dat PTED niet voldoet aan de stand van de wetenschap en praktijk. Met de PTED-studie willen wij de hypothese toetsen dat PTED bij patiënten met een lumbale hernia niet minder effectief is dan open microdiscectomie. Daarnaast zullen wij ook de kosteneffectiviteit analyseren. _Vraagstelling:_ Is PTED niet minder effectief en niet minder kosteneffectief dan microdiscectomie bij patiënten met lumbosacraal radiculair syndroom door een discushernia

Tissue Engineering - a new approach in articular cartilage repair

Item does not contain fulltextKU Nijmegen, 24 juni 1999Promotores : Veth, R.P.H., Berg, W.B. van den Co-promotor : Buma, P.144 p

Tissue engineering: a new approach in articular cartilage repair

Contains fulltext : 145602.pdf (Publisher’s version ) (Open Access)144 p

Potential healing benefit of an osteoperiosteal bone plug from the proximal tibia on a mosaicplasty donor-site defect in the knee. An experimental study in the goat.

Contains fulltext : 142093.pdf (publisher's version ) (Closed access)INTRODUCTION: Autologous osteochondral transplantation is a popular treatment for articular cartilage lesions in the knee joint. The donor defect is commonly left empty and remains a matter of concern. MATERIALS AND METHODS: In 20 knees of 10 goats, we created a standardised donor defect in the knee. In the control group the defects were left empty, whereas in two other groups a bone plug from the proximal tibia was press-fitted into the defect with or without a covering periosteal layer. RESULTS: Histological evaluation after 8 and 16 weeks showed that relatively rapid osteoclastic resorption of the bone plug occurred. Defects were mainly filled with fibrous tissue, and collapse of the adjacent bone and cartilage was visible, especially when the defects were left empty. Occasionally, some consolidation of the graft to the host bone could be detected, and in some samples periosteal chondrogenesis was present. CONCLUSION: Our findings suggest that transplantation of a tibial bone plug with covering periosteum to the donor defect in a cartilage transplantation procedure does not have any additional value in an attempt to minimise the damage at the donor site. The observed resorption of the bone plug and the collapse of the adjacent joint margin remain a matter of concern with this technique

Metal ion trend may be more predictive for malfunctioning metal-on-metal implants than a single measurement

Item does not contain fulltextForty-eight unilateral hip resurfacing arthroplasty patients were evaluated for cobalt and chromium levels. The metal ion trend of 42 well-functioning patients was compared with six sub-optimal functioning patients. Median metal ion levels were significantly higher for the sub-optimal group. For the well-functioning implants, the percentage of patients with increasing cobalt/chromium levels between two consecutive time-intervals ('risers') gradually decreased from 90/86% (0-3 months) to 22/22% (24-36 months). The percentage of patients with increasing metal ion levels was higher in the sub-optimal group. The median absolute increase of this 'risers' subgroup was significantly lower for the well-functioning group at 12-24 months. Sub-optimal functioning MoM implants have a different metal ion trend than well-functioning implants, a higher chance of 'risers' and a larger absolute increase in time

Patients are more satisfied than they expected after joint arthroplasty.

Contains fulltext : 71510.pdf (publisher's version ) (Open Access)The aim of this study was to compare the preoperative patients' expectations with their postoperative satisfaction after arthroplasties of the hip and knee, using a visual analogue scale. The comparison was made in a group of 44 patients after 44 primary knee and hip joint arthroplasties. A visual analogue scale (VAS) was used for the assessment of expectation and satisfaction. The mean preoperative expectation VAS was 14.8 (SD: 14.3). The mean patient satisfaction at time of follow up was 13.0 (SD : 21.1). We found no agreement in the preoperative patient's expectation satisfaction versus postoperative satisfaction (p = 0.66). Moreover in our study, the patients expected to be less satisfied than they actually were at follow-up, which is shown with the Bland and Altman method. It appears that patients are not capable of predicting the outcome of the joint arthroplasty, which could be influenced by negative preoperative information on complications and risks. Pain and functional disability are probably the most important factors for the patients' satisfaction after arthroplasty surgery

Resurfacing hip arthroplasty better preserves a normal gait pattern at increasing walking speeds compared to total hip arthroplasty

Contains fulltext : 208127.pdf (publisher's version ) (Open Access)Background and purpose - Gait analysis performed under increased physical demand may detect differences in gait between total (THA) versus resurfacing hip arthroplasty (RHA), which are not measured at normal walking speed. We hypothesized that patients after RHA would reach higher walking speeds and inclines compared with THA. Additionally, an RHA would enable a more natural gait when comparing the operated with the healthy contralateral hip. Patients and methods - From a randomized controlled trial comparing THA with RHA with at least 5 years' follow-up patients with a UCLA score of more than 3 points (n = 34) were included for an instrumented treadmill gait analysis. 25 patients with a unilateral implant (primary analysis-16 THA versus 9 RHA) and 9 patients with a bilateral implant (sub-analysis-n = 5 RHA + THA; n = 4 THA + THA). Spatiotemporal parameters, ground reaction forces, and range of motion were recorded at increasing walking speeds and inclines. Functional outcome scores were obtained. Results - At a normal walking speed of 1.1 m/s and at increasing inclines no differences were recorded in gait between the 2 groups with a unilateral hip implant. With increasing walking speed the RHA group reached a higher top walking speed (TWS) (adjusted difference 0.07 m/s, 95% CI -0.11 to 0.25) compared with THA. Additionally, RHA patients tolerated more weight on the operated side at TWS (155 N, CI 49-261) and as such weight-bearing approached the unaffected contralateral side. For the RHA group a "between leg difference" of 8 N (CI 3-245) was measured versus -129 N (CI -138 to -29) for THA (adjusted difference 144 N, CI 20-261). Hip flexion of the operated side at TWS was higher after RHA compared with THA (adjusted difference 8 degrees , CI 1.7-14). Interpretation - In this study RHA patients reached a higher walking speed, and preserved a more normal weight acceptance and a greater range of hip flexion against their contralateral healthy leg as compared with patients with a THA

The use of near infrared spectroscopy in sports medicine

Application de la spectroscopie infrarouge proche dans les mesures des paramètres métaboliques du muscle au repos ou actif : instrumentations et méthodes, résultats obtenus pour évaluer le métabolisme oxydatif du muscle des athlète