Biomedical subjects

P Neyret

Publications and source records attributed to P Neyret.

At least 19 recordsLinked to original sources

PubMed2006

The evolution of osteoarthritis in 103 patients with ACL reconstruction at 17 years follow-up.

AIM: To evaluate the functional and radiological outcome of a bone-tendon-bone anterior cruciate ligament reconstruction, at long-term follow-up. METHODS: A retrospective study of 148 patients, of which 103 were available for long-term follow-up. Complete functional and radiological evaluation (International Knee Documentation Committee scale) were performed in 89 out of the 103 patients [Anderson AF. Rating scales. In: Fu FH, Harner CD, Vince KG, (Eds.). Knee Surgery, Baltimore, Williams and Wilkins vol. 1, 1994; 12, pp. 275-296]. RESULTS: The mean follow-up time was 17.4 years. Subjectively, 88% of the patients were very satisfied or satisfied. According to the IKDC score 55% had type A symptoms, 29% type B, 12% type C, and 4% type D. The IKDC ligament evaluation showed 14.9% type A, 44.8% type B, 35.8% type C, and 4.5% type D. At the review 22.7% had a narrowing <50% (C) and 4.7% a narrowing >50% (D). Onset of osteoarthritis showed an association with the status of the medial meniscus. Knees with a preserved (healthy or sutured) medial meniscus had a significantly (p < 0.05) better radiological outcome. Among these, 9% had a joint space narrowing <50% (C) and 2% had a narrowing >50% (D). Medial meniscectomy, residual laxity, and femoral chondral defects were associated with osteoarthritis. CONCLUSION: The outcome of anterior cruciate ligament reconstruction plus extra-articular tenodesis is good in the very long term, particularly in knees with a preserved medial meniscus.

Adult↗

PubMed2006

[Factors affecting reliability of TT-TG measurements before and after medialization: A CT-scan study].

PURPOSE OF THE STUDY: The purpose of this study was to evaluate the practical application of computed tomography (CT) measurements of the TT-TG (tibial tuberosity--trochlear groove) distance in patients undergoing surgery for patellar instability. MATERIAL AND METHODS: We reviewed retrospectively 42 patients (30 women, 12 men) who underwent surgery for patellar instability between 1989 and 2002. Objective evidence of unilateral instability was present in 36 patients and of bilateral instability in 6. Pre- and postoperative CT-scans of both knees were examined for each patient to measure the TT-TG distance for both knees (n = 48 knees). We also studied the difference in two consecutive TT-TG measurements made on 36 non operated knees. For the 48 operated knees, we compared the CT measurement of medialization (difference between the pre- and postoperative TT-TG) and the measurement made intraoperatively. RESULTS: For the 36 non-operated knees, the mean difference between two consecutive TT-TG measurements was 3.2 mm (range 0-13 mm). This difference was significant. For the 48 operated knees, medialization measured on the CT-scan was 8.6 mm on average. Medialization effectively measured intraoperatively was 6.9 mm on average for the same series of knees. Comparing these two types of measurement, the difference expressed in absolute value was 4.6 mm (range 0-20 mm). This corresponded to a 67% difference (4.6/6.9) for the TT-TG measurement compared with surgically performed medialization. DISCUSSION: For some authors, preoperative measurement of the TT-TG distance remains a useful tool for establishing therapeutic choices for patellar instability. It must be recalled however that the measurement error is to the order of 3.25 mm. Use of the TT-TG for postoperative assessment is however a much more difficult technique since the anatomic landmarks have been modified by surgery. A rigorously applied standard radiographic protocol is required. The surgeon can then conduct a critical analysis of the landmarks retained, the slices used and the values obtained.

Adult↗

PubMed2006

[Surgical management of pigmented villonodular synovitis of the knee: Retrospective analysis of 28 cases].

PURPOSE OF THE STUDY: The objective of this retrospective study was to analyze clinical observations in pigmented villonodular synovitis (PVNS) of the knee as well as response to treatment in order to better define the diagnostic approach and surgical treatment and follow-up of this rare benign proliferative disease of the synovial observed primarily in the knee joint. MATERIAL AND METHODS: Twenty-eight patients (13 men and 15 women) were treated for PVNS in our unit between 1996 and 2004. Twenty patients had diffuse disease and eight localized disease. In the localized forms, symptoms mimicked those provoked by intra-articular foreign bodies or meniscal tears (n = 6) and had been present for 14 months on average at first consultation. Mean age at treatment onset was 40 years (range 20-62). Arthroscopic or open surgery was used for resection. In the diffuse forms, symptoms had begun 15 months on average before first consultation and were mainly spontaneous hemarthrosis or diffuse non-specific knee pain. Mean age at treatment onset was 38 years (range 15-59). Bone lesions were observed in four patients. Synoviorthesis or surgical synovectomy were performed. Mean follow-up was 97 months (range 12-309). Outcome was compared between the different aspects of localized and diffuse PVNS and treatment modalities. RESULTS: In the localized forms, there were no complications after surgical treatment and there were no cases of recurrence (one surgical revision at four months following incomplete resection). For the diffuse forms, the cumulative recurrence rate was 50%. Mean time to recurrence was 37 months. Three patients developed a stiff knee after open synovectomy. Surgical treatment was required in four patients seen late after development of bony lesions (total knee arthroplasty in three). Clinical outcome was good with a gain in knee flexion. DISCUSSION: MRI is essential for the topographic diagnosis and to guide surgical treatment. In severe or advanced primary diffuse disease or in the event of local recurrence, adjuvant synoviorthesis can be proposed four to eight weeks after initial surgery. The risk of recurrence for diffuse forms warrants an annual MRI for the first four years.

Adult↗

PubMed2005

[Not Available].

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Journal Article↗

PubMed2004

[Knee para-articular flexion and extension osteotomies in adults].

The present review analyzes the rare indications for sagittal knee osteotomies either for some complex cases of capsular and ligamentous laxities in combination with or without bony deformities in the sagittal plane. A thorough clinical and radiological analysis of the patients' knees is mandatory. We routinely recommend lateral standing X-rays to assess not only the bony structures, but also an abnormal knee laxity in the sagittal plane. We present different surgical options and preliminary results of these technically demanding procedures.

Bone Malalignment↗

PubMed2004

Anterior cruciate reconstruction combined with valgus upper tibial osteotomy: 12 years follow-up.

A retrospective review of 29 patients (30 knees) was carried out who had previously undergone a single-stage combined ACL reconstruction with valgus upper tibial osteotomy for chronic ACL rupture coupled with early medial tibio-femoral arthritis. Of the 30 knees, 19 (63%) had had a previous medial meniscectomy. Major complications occurred in two knees resulting in stiffness. At a mean of 12 years follow-up (6-16 years) only five knees (17%) had progressed one arthritis grade. Fourteen patients (47%) returned to intensive sports, and a further 11 (37%) played moderate sports. The mean difference in anterior tibial translation with the opposite normal knee was 3 mm at review. It was concluded that the combined operation has a low morbidity, controls anterior laxity, allows many patients to return to sports, and does not result in a rapid progression of osteoarthritis.

Adolescent↗

PubMed2004

[Revision total knee arthroplasty after unicompartmental femorotibial prosthesis: 54 cases].

PURPOSE OF THE STUDY: We analyzed technical difficulties encountered when performing revision total knee arthroplasty in patients with unicompartmental femorotibial prostheses. MATERIAL AND METHODS: This multicentric retrospective study included 54 revisions of unicompartmental femorotibial prosthesis with implantation of a total knee prosthesis. The series included 45 medial and nine lateral compartment prostheses. A gliding total knee prosthesis was implanted in 53 cases (98%) (39 standard, 14 revision). Mean time to failure of the unicompartmental prosthesis was four years. IKS scores were established at review. The radiological work-up included AP and lateral views in single leg stance and goniometry for 22 medial compartment revisions. Twenty-seven patients were seen for physical examination and x-rays and eight were lost to follow-up; data were recorded from medical files for 19 patients. RESULTS: The revision procedure was considered easy in 82% of the cases. Mean follow-up after revision was four years (range 2 - 12 years). Subjective outcome was very satisfactory for 56% of the patients, satisfactory for 36% and unsatisfactory for 8%. The mean function score was 62 points, the mean knee score 85 points, and the mean flexion was 113 degrees. No laxity was found for 90% of the knees. The femorotibial angle was 180 +/- 2 degrees in 46% of the patients. The mechanical femoral angle was 90 degrees in 54% of the patients with 2-4 degrees varus in 42%. The mechanical tibial angle was 90 degrees in 46% of the patients with 2-8 degrees valgus in 37%. Complications included pulmonary embolism (n=2), mobilization under general anesthesia (n=3), arthrolysis (n=1), lateral vertical patellectomy (n=1), and secondary infection (n=1). There were five failures requiring changing the total knee prosthesis. DISCUSSION: Loss of bone stock raises specific problems during revision of unicompartmental knee prostheses. Loss of tibial bone is more frequent but it is more difficult to correct for loss of femoral bone. A gliding knee prosthesis is generally preferred for first intention revision. We recommend a long stem when the bone defect is important or involves loss of cortical bone. We have had good mid-term results with revision total knee prostheses after unicompartmental prostheses. Longer follow-up is needed. Poor results were obtained when revision was performed for persistent pain without a clearly defined cause. The presence or not of significant bone loss did not appear to affect outcome. The observation of medial laxity in case of failed lateral unicompartmental prostheses suggests a more constrained total knee prosthesis might be indicated. Compared with earlier series, our results with total knee prostheses after unicompartmental prostheses appear to be better than after tibial valgus osteotomy and also better than after total knee arthroplasty. Conversely, they would be less satisfactory than for primary total knee arthroplasty. The surgical procedure for revision total knee arthroplasty after unicompartmental prosthesis requires precision and skill but is not technically difficult.

Aged↗

PubMed2004

[Subjective evaluation of surgical treatment for patellar instability].

PURPOSE OF THE STUDY: We analyzed functional outcome after surgical treatment for patellar instability. MATERIAL AND METHODS: This study included 130 patients (174 knees) treated between 1988 and 1999. Minimum follow-up after surgery was two Years, mean five years (range 24-152 months). The IKDC 1999 subjective evaluation chart was used. This chart has ten items to establish level of sports activity and functional status of the knee for daily life activities. One hundred ten patients (84.5%) responded to the questionnaire. RESULTS: Eighty-eight patients were seen for clinical assessment and 22 were questioned by telephone: 104 patients (94.5%) were satisfied or very satisfied, five (4.5%) were dissatisfied, and one was disappointed. We evaluated results on the basis of pain (37.6% with climate-related pain or discomfort), residual effusion, and sensation of blocked knee (15.8%), as well as daily activities (68% with discomfort when kneeling), and sports activities (with level of activity). DISCUSSION: The patients' subjective assessment showed that surgical treatment with medialization and/or lowering of the anterior tibial tuberosity is effective with a good or excellent rate of satisfaction. The quality of these results was directly related to careful individualization of the lesions with systematic analysis of factors leading to patellar instability (trochlear dysplasia, patellar height, quadriceps dysplasia, TA-GT measures, length of the patellar tendon).

Activities of Daily Living↗

PubMed2003

A comparative study of medial versus lateral arthroscopic partial meniscectomy on stable knees: 10-year minimum follow-up.

PURPOSE: Our goal was to compare results of partial medial arthroscopic meniscectomy with results of partial lateral arthroscopic meniscectomy and to determine prognostic factors. TYPE OF STUDY: Retrospective comparative study with statistical analysis. METHODS: In this study, 362 medial and 109 lateral isolated arthroscopic meniscectomies are presented with a minimum follow-up time of 10 years. All knees were stable with no previous surgery or traumatic lesion. RESULTS: In this study, 95% of the patients were very satisfied or satisfied with the results of the medial meniscectomy, and 95.5% with results of the lateral meniscectomy (P =.32). According to grades 1 and 2 of the International Knee Documentation Committee (IKDC) form, 85.8% of the medial meniscectomy group were free of any symptoms, as were 79.7% of the lateral meniscectomy group (P =.11). Radiologic changes after medial and lateral meniscectomy were found in 21.5% and 37.5%, respectively (P =.11). The rates of radiologic changes in patients in whom the contralateral knee was radiologically normal were 22.3% and 39%, respectively (P =.016). The rate of repeat surgeries for osteoarthritis was less than 0.2%. CONCLUSIONS: Subjective and clinical results after medial or lateral meniscectomy are quite similar, but radiologic results are significantly worse after lateral meniscectomy. The most accurate way to determine the degeneration caused by the meniscectomy is to evaluate joint space narrowing in patients in whom the contralateral knee was radiologically normal. Otherwise, partial medial or lateral meniscectomy are well tolerated. A better prognosis can be predicted for a patient with an isolated medial meniscal tear with one or more of the following factors: age less than 35 years, a vertical tear, no cartilage damage, and an intact meniscal rim at the end of the meniscectomy. With an isolated lateral meniscal tear, a better prognosis can be predicted if the patient is young and has an intact meniscal rim at the end of the meniscectomy.

Adolescent↗

PubMed2003

[Study of the patellar apex in objective patellar dislocation].

PURPOSE OF THE STUDY: The purpose of this work was to study the morphology of the patella in search of dysplasia typical of objective patellar dislocation. MATERIAL AND METHODS: One hundred forty patients (190 knees), 80 women and 60 men, who underwent surgery between 1988 and 1999 were included in this study. Mean age was 22.6 years (range 13-47). Patellar morphology was analyzed on the preoperative lateral x-rays (n=190) taken at 30 degrees flexion. The apex of the patella was measured as well as the length of the patellar tendon. The width of the patella was measured on the computed tomography scan (n=158). For 64 knees, magnetic resonance images of the patella were available on which the length and width of the patella, the articular surface, and the patellar tendon were measured. Ninety contralateral knees were symptom free and x-rays were available for 67. RESULTS: According to the Grelsamer classification, 80% of the patellae presented a normal apex. The length of the patellar apex was significantly shorter when the patellar ligament was longer. Using the Wiberg classification, men had more dysplasic patellae (grade C) (p=0.007). There was also a correlation between the Wiberg classification and the Maldague classification. The length of the medial border of the patella and the patellar angle were 2 factors directly related to the Wiberg classification. Mean width of the patella was 39.1 mm (computed tomography measurements). The mean length of the patellar tendon was 53.8 on the magnetic resonance images with a mean articular surface measuring 30.8 mm, a mean patellar length measuring 40.6 mm, and a mean width measuring 38.7 mm. There was no correlation between trochlear dysplasia and patellar morphology. DISCUSSION: There is little data in the literature concerning patellar morphology since Wiberg's work in 1941. The hypothesis of patellar dysplasia rather than trochlear dyplasia, the principal factor involved in objective patellar dislocation, has not been explored extensively. The presence of a hypoplasic medial border, Wiberg grade C, or a short patellar apex suggests that a particular patellar morphotype would be involved in objective patellar dislocation.

Adolescent↗

PubMed2002

[Arthroscopic reconstruction of the anterior cruciate ligament].

PURPOSE OF THE STUDY: We report a retrospective series of 83 patients (86 knees) who underwent reconstruction surgery for chronic anterior knee laxity. The purpose of this study was to analyze mid-term results and assess prognosis factors. MATERIAL AND METHODS: All patients underwent artrhoscopic reconstruction of the anterior cruciate ligament using a central one-third patellar tendon graft. Full follow-up data were available for 51 patients (52 knees) and partial data for 24 others (25 knees). Eight patients (9 knees) were lost to follow-up. The IKDC criteria were used to analyze outcome at a mean 6 years post-surgery. RESULTS: Graft failure was observed in 5 knees and a graft tears after a new sprain was seen at 3 years. The patients were satisfied or very satisfied in 88.5% of the cases. The Trillat-Lachman test revealed a persistent dampened brake in 5 knees and a frank click in 4 (7.7%). Complete movement was recovered in all knees excepting 2 exhibiting persistent flexion. Residual laxity (active Lachman test) was 5 mm in 81.5% of the cases, between 6 and 10 mm in 17%, and greater than 10 mm in only 1 case (2.5%). IKDC scores were A=25%, B=50%, C=21% and D=4%. Forty-two patients (61%) returned to their sports activities and 9 of the 12 high-level athletes resumed competition at the same level as preoperatively. Arthroscopy enabled a well- or very well-positioned femoral tunnel in 88% of the cases, conditioning final IKDC outcome (p<0.02). There was a correlation between the meniscal status and residual laxity. DISCUSSION: This study demonstrated a high proportion (21%) of patients with an incomplete repair (21% IKDC class C) with a residual laxity greater than 5 mm and a late hard brake. Simple patellar tendon graft provided insufficient repair of the anterior cruciate ligament. The subjective outcome was better than the objective outcome since 88.5% of the patients were satisfied or very satisfied (patients seen at last follow-up or contacted by telephone). Good objective outcome was correlated with good femoral position of the transplant and preservation of the meniscus. Failures were explained by poor position of the transplant, long-standing laxity, and renewal of sports activities too early. CONCLUSION: Arthroscopic repair of the anterior cruciate ligament is a reliable procedure, but as failures are observed, indications should take into consideration the type of laxity and the status of the meniscus. For unique anterior laxity, the central one-third patellar tendon graft gives good results. For advanced anterior laxity, augmentation with an extra-articular lateral tenodesis would be necessary.

Anterior Cruciate Ligament↗

PubMed2002

[Seventeen year outcome after anterior cruciate ligament reconstruction with a intact or repaired medial meniscus].

PURPOSE OF THE STUDY: Ten-year outcome of anterior cruciate ligament (ACL) reconstruction was previously reported (1992-1993) for 148 patients who had ACL free grafts associated with extra-articular tenodesis. In this retrospective study, we examined the functional and radiological changes observed 17 years after surgery in patients whose menisci were intact or repaired at ACL reconstruction (46 cases). These patients were operated on between 1978 and 1983. MATERIAL AND METHODS: Between January and April 1999, 28 patients were reviewed clinically and radiographically. Nine other patients responded to a questionnaire and three of them sent their x-rays. Two patients had died since the last review and 7 were lost to follow-up. Mean age at follow-up was 41 years. The IKDC classification was A 18.5%, B 51%, C 22.2%, D 7.4% in 26 patients reviewed with the passive radiological Lachman. At subjective analysis (n=37), 70% of the patients were very satisfied and 27% were satisfied. At radiological analysis (n=31), the AP or lateral single-limb stance views and the AP two-limb weight bearing views at 45% flexion demonstrated preosteoarthritis in 22% and osteoarthritis in 3%. Residual anterior tibial translation was the same at 11 years and 17 years follow-up. DISCUSSION: This study clearly demonstrates that ACL reconstruction associated with extra-articular tenodesis can provide good functional and radiological results at 17 years mean follow-up for patients with preserved (sound or sutured) menisci. The status of the medial meniscus at long-term follow-up appears to be the key feature determining the low rate of degenerative changes.

Adult↗

PubMed2002

[Influence of the height of the joint space on the three-dimensional kinetics of total knee prostheses and behavior of the lateral ligaments: an in vitro study].

PURPOSE OF THE STUDY: The level of the joint space can be modified after implantation of a total knee prosthesis. Likewise, ligament balance is a cardinal point of the surgical technique. The purpose of this in vitro work was to study the influence of the position of the distal tibiofemoral joint space after implantation of a total knee prosthesis on the three-dimensional kinetics of the knee joint and on the behavior of the lateral ligaments. MATERIAL AND METHOD: Total knee arthroplasty (TKA) with a posterior stabilized prosthesis was performed on seven fresh-frozen cadaver specimens. A specially-designed experimental device was used to achieve continuous knee motion simulating hip flexion from a vertical position. The Vicon optoelectronic system was used to record the femorotibial and femoropatellar kinematics in three dimensions. Two electronic goniometers were positioned on the insertions of the lateral ligaments to measure ligament displacements during knee movements. Five configurations were recorded on each knee: healthy knee, same knee after TKA, and 2-mm and 4-mm upward displacement of the prosthetic distal tibiofemoral joint space. Ligament balance at extension was preserved in all configurations. The kinematic curves obtained were compared with the coefficient of multiple correlation. RESULTS: Changing the position of the joint space had a significant effect on the kinematics of the patella (rotation and abduction-rotation) but did not have a significant effect on the femorotibial kinematics. Variations in the length of the lateral ligaments were of small amplitude. Lowering the joint space led to laxity at flexion. Raising the joint space tightened the ligaments at flexion. DISCUSSION: These results confirm our clinical impression when the level of the distal femur cut is set to achieve tension on the ligaments at knee extension. If the joint space is lowered, i.e. with a more sparing distal femur cut, the prosthesis takes up less space during flexion, leading to laxity at flexion. If the joint space is raised, i.e. with an excessive distal femur cut, the prosthesis takes up more space during flexion, tightening the lateral ligaments. CONCLUSION: The position of the joint space must be rigorously reproduced during TKA not only to maintain correct femorotibial kinematics, but most importantly to preserve patellar kinematics and proper behavior of the lateral ligaments. Ideally, the height of the joint space should be restored first, followed by control of the ligament balance. An over- or undercut of the femur can lead to defective femoropatellar kinematics and ligament tension at flexion despite good ligament balance at extension. In addition, ligament balance should not be achieved by displacing the tibial cut or by modifying the thickness of the tibial component, which would have an effect not only at extension but also at flexion.

Anthropometry↗

PubMed2001

The natural history of the knee following arthroscopic medial meniscectomy.

We examined the natural history of arthroscopic medial meniscectomy in knees with an isolated meniscal injury by reviewing 317 of 894 cases following medial meniscectomy. At the time of the initial surgery none of the knees had been operated on, and there was no evidence of ligament injury. The patients were reviewed clinically and radiologically after a mean of 11.5 years (range 10-15). The knee was considered "normal" or "nearly normal" by 91% of patients. In 218 patients the contralateral knee was asymptomatic without history of operation or significant injury and could be used as control for comparison. Radiology showed 22.4% greater excess prevalence of joint space narrowing in the operated compared to the control knee. The factors predisposing to a poor radiological result were age above 35 years, the presence of medial compartment cartilage degeneration at the time of the first arthroscopy, resection of the posterior one-third of the meniscus, and meniscal rim resection. Preoperative participation in sport was a predictor of a better outcome.

Adolescent↗

PubMed2001

Results at 11.5 years of a series of 376 posterior stabilized HLS1 total knee replacements. Survivorship analysis, and risk factors for failure.

Of 376 cemented posterior stabilized HLS1 TKRs inserted in 329 patients (mean age 70) between 1984 and 1988, information was available on 306 (81.4%) at the third follow-up in 1998: 118 patients deceased; 163 followed up clinically (Knee Society score) and radiographically; 25 revised (15 infections; 10 mechanical failures). At a mean follow-up of 11.5 years, the mean pain score was 43/50, and the mean ROM score 21/25 (both unchanged since 1989). The function score had declined linearly, from 70/100 in 1989 to 60/100 in 1998. Forty percent had tibial radiolucencies correlating with the extent of preoperative bone wear. Polyethylene wear (seen in 35% of knees) was always < 3 mm. The implant survival rate (infections included) was 93.7% (+/- 1.4%) after 10 years. All the mechanical failures were in advanced-OA patients with ACL-deficient knees and major bony deficiencies.

Aged↗

PubMed2000

[Revision in non-infected total knee arthroplasty: an analysis of 69 consecutive cases].

PURPOSE OF THE STUDY: We reviewed 69 consecutive cases of total knee arthroplasty revisions to analyze the causes of failure. MATERIAL AND METHODS: Sixty-nine total knee arthroplasty revisions were required between 1990 and 1997 for non-septic failure. Five categories of failures were identified: 30 loosenings including 11 with an initial malposition (varus position of the tibial component in 8 cases), 14 laxities (medial in 5, lateral in 5 and anteroposterior in 4), 11 stiff knees with no other clinical or radiological anomaly, 6 patellar failures (2 dislocations, 2 cases of excessive wear, 2 painful knees with a Freeman prosthesis), and 8 cases of painful knees with no other detectable anomaly. RESULTS: A three-phase reconstruction procedure was used after removing the failing TKA: 1) reconstruction of the tibia with replacement of lost bone, 2) reconstruction of the femur with balanced flexion determining the size of the implant, 3) balanced extension determining the distal/proximal position of the femoral component. A "simple" sliding prosthesis was used in 16 cases, a modular reconstruction prosthesis in 40 cases and a hinge prosthesis in 13 cases. Mean follow-up for functional and radiographic assessment after revision surgery was 37 months (59 cases) with a minimum follow-up of 1 year. The best outcome was observed in the "loosening", "laxity", and "stiffness" patients. Outcome was less favorable for the group "isolated pain" with IKS functional scores of 35.5 +/- 16 and 52.5 +/- 21. DISCUSSION: In 36 p. 100 of cases, TKA failure was related to a technical mistake (component malposition, poor ligament alignment). In 33 p. 100, failure was patient related (multiple procedures, congenital hip dysplasia, rheumatoid arthritis.). Outcome after revision TKA was less favorable than after primary TKA, particularly in case of painful knees with no other detectable anomaly. CONCLUSION: Surgical revision of TKA must follow a rigorous procedure with a detailed preoperative work-up. The decision for revision must not be made unless a precise anomaly has been identified.

Adult↗

PubMed1999

[Peroperative accidental contamination of bone-tendon-bone graft for the reconstruction of the anterior cruciate ligament. Report of 4 cases].

PURPOSE OF THE STUDY: The aim of this paper is to report the outcome in four patients in whom the graft (bone-patellar tendon-bone) was dropped onto the operating-room floor during anterior cruciate ligament reconstruction, and was then re-implanted after decontamination by topic antibiotic treatment. MATERIAL AND METHODS: Between 1992 and 1996, 1038 anterior cruciate ligament reconstructions were performed. In four cases, the bone-patellar-tendon-bone graft was dropped onto the operating theater floor. The graft was then soaked in rifamycin at a concentration of 0.8 mg/ml in normal saline for 10 mn, and soaked in gentamycin at 0.6 mg/ml for a further 10 mn. Finally, the graft was washed in physiological saline. All cases had been given a loading dose of second generation cephalosporin (cefamandole), after deflating the tourniquet. Post-operatively, the patients were given amoxicillin and clavulanic acid for 15 days. The patients were reviewed radiologically and clinically (IKDC form) with a mean follow-up of 24 months. RESULTS: Post operatively all patients had an uncomplicated recovery. No wound problems was observed in 3 of the four patients achieved an IKDC grade A knee. The final patient had a grade B, after 55 month follow-up. All patients recovered their initial sport level. The radiological Lachman test shows a mean differential value of 0.3 mm. DISCUSSION: Dropping the graft during ACL reconstruction is a very rare problem. In this event, the surgeon can choose several options: Harvesting an other site, sterilizing the graft by irradiation, autoclaving, ethylene oxyde..., or using a topical antibiotic treatment. Cooper showed, in an in vitro study that the contamination rate was halved by antibiotic soaking of the graft. CONCLUSION: We used a topic antibiotic treatment with success in all four cases. We feel warranted the implantation of a graft which has been dropped, and then antibiotic soaked. The patient should of course be informed and told to report any sign or symptom of infection. On the strength of this result, we would like to propose a decontamination protocol which can be used in this sort of incident, fortunately very rare.

Anterior Cruciate Ligament↗

PubMed1999

[Total knee prosthesis and simultaneous corrective tibial osteotomy, for osteoarthritis and severe congenital tibia varum deformity].

INTRODUCTION: Restoration of the normal mechanical axis of the knee and balancing of the surrounding soft tissues have been shown to have an important bearing on the final outcome of total knee arthroplasty. In knees with severe congenital varum deformity these goals may be difficult to achieve. MATERIAL AND METHODS: In four patients with osteoarthritis and severe congenital knee varum deformity of more than 15 degrees, we performed a high tibial valgus osteotomy with opening wedge, combined during the same procedure with total knee arthroplasty. RESULTS: As correction of the extra-articular deformity was obtained by the osteotomy, in none of the cases it was necessary to perform extensive soft tissue release or advancement to restore alignment. Postoperative X-rays demonstrated restoration of the normal mechanical axis in three cases, but in one case the angular correction of the osteotomy was insufficient and we observed a 9 degrees residual varus deformity. DISCUSSION: The osteoarthritic knee must be mechanically realigned for any total knee arthroplasty to be successful in the long term. Most commonly angular deformities are manifestations of the arthritis process, but sometimes, like in congenital varus deformity of the tibia, part of the deformation can be extra-articular in origin. In these cases, restoring alignment and stability may be difficult to achieve. The association of high tibial valgus osteotomy with total knee arthroplasty permits the correction of the extra-articular deformity, by the osteotomy, without performing extensive soft tissue release, as would be needed in total knee arthroplasty alone. CONCLUSION: Total knee arthroplasty associated with high tibial valgus osteotomy seems to be a technically satisfying alternative in patients with osteoarthritis and severe congenital varus deformity of the tibia.

Aged↗