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L Perlick - One of the best experts on this subject based on the ideXlab platform.

  • minimal invasive and computer assisted total knee replacement compared with the Conventional Technique a prospective randomised trial
    Knee Surgery Sports Traumatology Arthroscopy, 2008
    Co-Authors: C Luring, J Beckmann, J Grifka, L Perlick, P Haibock, Markus Tingart
    Abstract:

    Minimal invasive surgery (MIS) in total knee replacement (TKR) has been favoured by several authors and the industry and is asked for by the patients. Computer assisted surgery (CAS) is proposed to support the surgeon in terms of postoperative leg alignment and implant orientation. To prove the hypothesis that MIS in TKR fastens early rehabilitation compared to the standard approach and that CAS–MIS in TKR improves accuracy in implant position compared to the freehand MIS and freehand standard Technique, we performed a prospective, randomised short-term trial which was approved by the local ethic committee. In total, 90 patients underwent TKR. The Conventional group (n = 30) underwent Conventional TKR, the MIS group (n = 30) underwent MIS–TKR without navigation, the CAS–MIS group (n = 30) underwent TKR using navigation and the MIS approach. Groups were comparable regarding patients’ specific parameters. The length of incision in extension was significantly lower in the MIS (13.2 cm) and CAS–MIS Technique (12.9 cm) compared to the Conventional Technique (17.3 cm) (P < 0.01). Knee Society and WOMAC Score were similar in all three groups after 1, 6 and 12 weeks, no significant differences were seen between groups at any point of time. Postoperative deviation of the mechanical leg axis was significantly better in the CAS–MIS group compared to the Conventional group and the MIS one (P < 0.05). The clinical relevance of our results is that the benefit of the minimal invasive approach in TKR is still not proven and navigation improves postoperative accuracy of leg alignment and component orientation. Our study shows that for the group of patients included there is no statistically significant difference in early rehabilitation between MIS and the Conventional approach based on the Knee Society and WOMAC Score. Using the CAS Technique restoration of leg axis was more accurate.

  • computer assisted total knee arthroplasty versus the Conventional Technique how precise is navigation in clinical routine
    Knee Surgery Sports Traumatology Arthroscopy, 2008
    Co-Authors: Markus Tingart, C Luring, H Bathis, J Beckmann, J Grifka, L Perlick
    Abstract:

    Restoration of the mechanical leg axis and component positioning are crucial factors affecting long-term results in total knee arthroplasty (TKA). In a prospective study, 1,000 patients were operated on either using a CT-free navigation system or the Conventional jig-based Technique. Leg alignment and component orientation were determined on postoperative X-rays. The mechanical leg axis was significantly better in the computer-assisted group (95%, within ±3° varus/valgus) compared to the Conventional group (74%, within ±3° varus/valgus) (P < 0.001). On average, the operating time was increased by 8 min in the computer-assisted group. No significant differences were seen between senior and younger surgeons regarding postoperative leg alignment and operating time. Computer-assisted TKA leads to a more accurate restoration of leg alignment and component orientation compared to the Conventional jig-based Technique. Potential benefits in long-term outcome and functional improvement require further investigation.

  • computer assisted total knee arthroplasty versus the Conventional Technique how precise is navigation in clinical routine
    Knee Surgery Sports Traumatology Arthroscopy, 2008
    Co-Authors: Markus Tingart, C Luring, H Bathis, J Beckmann, J Grifka, L Perlick
    Abstract:

    Restoration of the mechanical leg axis and component positioning are crucial factors affecting long-term results in total knee arthroplasty (TKA). In a prospective study, 1,000 patients were operated on either using a CT-free navigation system or the Conventional jig-based Technique. Leg alignment and component orientation were determined on postoperative X-rays. The mechanical leg axis was significantly better in the computer-assisted group (95%, within +/-3 degrees varus/valgus) compared to the Conventional group (74%, within +/-3 degrees varus/valgus) (P < 0.001). On average, the operating time was increased by 8 min in the computer-assisted group. No significant differences were seen between senior and younger surgeons regarding postoperative leg alignment and operating time. Computer-assisted TKA leads to a more accurate restoration of leg alignment and component orientation compared to the Conventional jig-based Technique. Potential benefits in long-term outcome and functional improvement require further investigation.

  • revision total knee arthroplasty a comparison of postoperative leg alignment after computer assisted implantation versus the Conventional Technique
    Knee Surgery Sports Traumatology Arthroscopy, 2005
    Co-Authors: L Perlick, Markus Tingart, C Luring, H Bathis, Carsten Perlick, J Grifka
    Abstract:

    Accurate reconstruction of leg alignment is one important factor for long-term survival in total knee arthroplasty (TKA). Recent developments in computer-assisted surgery focused on systems improving TKA. The aim of the study is to compare the results of computer-assisted revision TKA with the Conventional Technique. We hypothize that a significantly better leg alignment and component orientation is achieved when using a navigation system for revision TKA. In a prospective study, two groups of 25 revision TKAs each were operated on using either a CT-free navigation system or the classical surgeon-controlled Technique. The postoperative leg alignment was analysed on long-leg coronal and lateral X-rays. The mechanical limb axis was significantly better in the navigation-based group. Twenty-three patients (92%) in the computer-assisted group had a postoperative leg axis between 3° varus/valgus deviation, while 19 patients (76%) in the Conventional group had a comparable result (p<0.05). Further, significant differences were seen for the coronal orientation of the femoral component. Computer-assisted revision TKA leads to a superior restoration of leg alignment compared with the Conventional Technique. Particularly the real-time presentation of the actual leg axis and the flexion and extension gaps is useful in revision TKA. Potential benefits in long-term outcome and functional improvement require additional investigation.

  • navigation in total knee arthroplasty ct based implantation compared with the Conventional Technique
    Acta Orthopaedica Scandinavica, 2004
    Co-Authors: L Perlick, Markus Tingart, H Bathis, Carsten Perlick, J Grifka
    Abstract:

    Background Exact axial limb alignment in total-knee arthroplasty (TKA) is important for a successful outcome. We evaluated the efficiency of computer-assisted implantation in TKA and compared it wi...

J Grifka - One of the best experts on this subject based on the ideXlab platform.

  • minimal invasive and computer assisted total knee replacement compared with the Conventional Technique a prospective randomised trial
    Knee Surgery Sports Traumatology Arthroscopy, 2008
    Co-Authors: C Luring, J Beckmann, J Grifka, L Perlick, P Haibock, Markus Tingart
    Abstract:

    Minimal invasive surgery (MIS) in total knee replacement (TKR) has been favoured by several authors and the industry and is asked for by the patients. Computer assisted surgery (CAS) is proposed to support the surgeon in terms of postoperative leg alignment and implant orientation. To prove the hypothesis that MIS in TKR fastens early rehabilitation compared to the standard approach and that CAS–MIS in TKR improves accuracy in implant position compared to the freehand MIS and freehand standard Technique, we performed a prospective, randomised short-term trial which was approved by the local ethic committee. In total, 90 patients underwent TKR. The Conventional group (n = 30) underwent Conventional TKR, the MIS group (n = 30) underwent MIS–TKR without navigation, the CAS–MIS group (n = 30) underwent TKR using navigation and the MIS approach. Groups were comparable regarding patients’ specific parameters. The length of incision in extension was significantly lower in the MIS (13.2 cm) and CAS–MIS Technique (12.9 cm) compared to the Conventional Technique (17.3 cm) (P < 0.01). Knee Society and WOMAC Score were similar in all three groups after 1, 6 and 12 weeks, no significant differences were seen between groups at any point of time. Postoperative deviation of the mechanical leg axis was significantly better in the CAS–MIS group compared to the Conventional group and the MIS one (P < 0.05). The clinical relevance of our results is that the benefit of the minimal invasive approach in TKR is still not proven and navigation improves postoperative accuracy of leg alignment and component orientation. Our study shows that for the group of patients included there is no statistically significant difference in early rehabilitation between MIS and the Conventional approach based on the Knee Society and WOMAC Score. Using the CAS Technique restoration of leg axis was more accurate.

  • computer assisted total knee arthroplasty versus the Conventional Technique how precise is navigation in clinical routine
    Knee Surgery Sports Traumatology Arthroscopy, 2008
    Co-Authors: Markus Tingart, C Luring, H Bathis, J Beckmann, J Grifka, L Perlick
    Abstract:

    Restoration of the mechanical leg axis and component positioning are crucial factors affecting long-term results in total knee arthroplasty (TKA). In a prospective study, 1,000 patients were operated on either using a CT-free navigation system or the Conventional jig-based Technique. Leg alignment and component orientation were determined on postoperative X-rays. The mechanical leg axis was significantly better in the computer-assisted group (95%, within ±3° varus/valgus) compared to the Conventional group (74%, within ±3° varus/valgus) (P < 0.001). On average, the operating time was increased by 8 min in the computer-assisted group. No significant differences were seen between senior and younger surgeons regarding postoperative leg alignment and operating time. Computer-assisted TKA leads to a more accurate restoration of leg alignment and component orientation compared to the Conventional jig-based Technique. Potential benefits in long-term outcome and functional improvement require further investigation.

  • computer assisted total knee arthroplasty versus the Conventional Technique how precise is navigation in clinical routine
    Knee Surgery Sports Traumatology Arthroscopy, 2008
    Co-Authors: Markus Tingart, C Luring, H Bathis, J Beckmann, J Grifka, L Perlick
    Abstract:

    Restoration of the mechanical leg axis and component positioning are crucial factors affecting long-term results in total knee arthroplasty (TKA). In a prospective study, 1,000 patients were operated on either using a CT-free navigation system or the Conventional jig-based Technique. Leg alignment and component orientation were determined on postoperative X-rays. The mechanical leg axis was significantly better in the computer-assisted group (95%, within +/-3 degrees varus/valgus) compared to the Conventional group (74%, within +/-3 degrees varus/valgus) (P < 0.001). On average, the operating time was increased by 8 min in the computer-assisted group. No significant differences were seen between senior and younger surgeons regarding postoperative leg alignment and operating time. Computer-assisted TKA leads to a more accurate restoration of leg alignment and component orientation compared to the Conventional jig-based Technique. Potential benefits in long-term outcome and functional improvement require further investigation.

  • revision total knee arthroplasty a comparison of postoperative leg alignment after computer assisted implantation versus the Conventional Technique
    Knee Surgery Sports Traumatology Arthroscopy, 2005
    Co-Authors: L Perlick, Markus Tingart, C Luring, H Bathis, Carsten Perlick, J Grifka
    Abstract:

    Accurate reconstruction of leg alignment is one important factor for long-term survival in total knee arthroplasty (TKA). Recent developments in computer-assisted surgery focused on systems improving TKA. The aim of the study is to compare the results of computer-assisted revision TKA with the Conventional Technique. We hypothize that a significantly better leg alignment and component orientation is achieved when using a navigation system for revision TKA. In a prospective study, two groups of 25 revision TKAs each were operated on using either a CT-free navigation system or the classical surgeon-controlled Technique. The postoperative leg alignment was analysed on long-leg coronal and lateral X-rays. The mechanical limb axis was significantly better in the navigation-based group. Twenty-three patients (92%) in the computer-assisted group had a postoperative leg axis between 3° varus/valgus deviation, while 19 patients (76%) in the Conventional group had a comparable result (p<0.05). Further, significant differences were seen for the coronal orientation of the femoral component. Computer-assisted revision TKA leads to a superior restoration of leg alignment compared with the Conventional Technique. Particularly the real-time presentation of the actual leg axis and the flexion and extension gaps is useful in revision TKA. Potential benefits in long-term outcome and functional improvement require additional investigation.

  • navigation in total knee arthroplasty ct based implantation compared with the Conventional Technique
    Acta Orthopaedica Scandinavica, 2004
    Co-Authors: L Perlick, Markus Tingart, H Bathis, Carsten Perlick, J Grifka
    Abstract:

    Background Exact axial limb alignment in total-knee arthroplasty (TKA) is important for a successful outcome. We evaluated the efficiency of computer-assisted implantation in TKA and compared it wi...

Markus Tingart - One of the best experts on this subject based on the ideXlab platform.

  • minimal invasive and computer assisted total knee replacement compared with the Conventional Technique a prospective randomised trial
    Knee Surgery Sports Traumatology Arthroscopy, 2008
    Co-Authors: C Luring, J Beckmann, J Grifka, L Perlick, P Haibock, Markus Tingart
    Abstract:

    Minimal invasive surgery (MIS) in total knee replacement (TKR) has been favoured by several authors and the industry and is asked for by the patients. Computer assisted surgery (CAS) is proposed to support the surgeon in terms of postoperative leg alignment and implant orientation. To prove the hypothesis that MIS in TKR fastens early rehabilitation compared to the standard approach and that CAS–MIS in TKR improves accuracy in implant position compared to the freehand MIS and freehand standard Technique, we performed a prospective, randomised short-term trial which was approved by the local ethic committee. In total, 90 patients underwent TKR. The Conventional group (n = 30) underwent Conventional TKR, the MIS group (n = 30) underwent MIS–TKR without navigation, the CAS–MIS group (n = 30) underwent TKR using navigation and the MIS approach. Groups were comparable regarding patients’ specific parameters. The length of incision in extension was significantly lower in the MIS (13.2 cm) and CAS–MIS Technique (12.9 cm) compared to the Conventional Technique (17.3 cm) (P < 0.01). Knee Society and WOMAC Score were similar in all three groups after 1, 6 and 12 weeks, no significant differences were seen between groups at any point of time. Postoperative deviation of the mechanical leg axis was significantly better in the CAS–MIS group compared to the Conventional group and the MIS one (P < 0.05). The clinical relevance of our results is that the benefit of the minimal invasive approach in TKR is still not proven and navigation improves postoperative accuracy of leg alignment and component orientation. Our study shows that for the group of patients included there is no statistically significant difference in early rehabilitation between MIS and the Conventional approach based on the Knee Society and WOMAC Score. Using the CAS Technique restoration of leg axis was more accurate.

  • computer assisted total knee arthroplasty versus the Conventional Technique how precise is navigation in clinical routine
    Knee Surgery Sports Traumatology Arthroscopy, 2008
    Co-Authors: Markus Tingart, C Luring, H Bathis, J Beckmann, J Grifka, L Perlick
    Abstract:

    Restoration of the mechanical leg axis and component positioning are crucial factors affecting long-term results in total knee arthroplasty (TKA). In a prospective study, 1,000 patients were operated on either using a CT-free navigation system or the Conventional jig-based Technique. Leg alignment and component orientation were determined on postoperative X-rays. The mechanical leg axis was significantly better in the computer-assisted group (95%, within ±3° varus/valgus) compared to the Conventional group (74%, within ±3° varus/valgus) (P < 0.001). On average, the operating time was increased by 8 min in the computer-assisted group. No significant differences were seen between senior and younger surgeons regarding postoperative leg alignment and operating time. Computer-assisted TKA leads to a more accurate restoration of leg alignment and component orientation compared to the Conventional jig-based Technique. Potential benefits in long-term outcome and functional improvement require further investigation.

  • computer assisted total knee arthroplasty versus the Conventional Technique how precise is navigation in clinical routine
    Knee Surgery Sports Traumatology Arthroscopy, 2008
    Co-Authors: Markus Tingart, C Luring, H Bathis, J Beckmann, J Grifka, L Perlick
    Abstract:

    Restoration of the mechanical leg axis and component positioning are crucial factors affecting long-term results in total knee arthroplasty (TKA). In a prospective study, 1,000 patients were operated on either using a CT-free navigation system or the Conventional jig-based Technique. Leg alignment and component orientation were determined on postoperative X-rays. The mechanical leg axis was significantly better in the computer-assisted group (95%, within +/-3 degrees varus/valgus) compared to the Conventional group (74%, within +/-3 degrees varus/valgus) (P < 0.001). On average, the operating time was increased by 8 min in the computer-assisted group. No significant differences were seen between senior and younger surgeons regarding postoperative leg alignment and operating time. Computer-assisted TKA leads to a more accurate restoration of leg alignment and component orientation compared to the Conventional jig-based Technique. Potential benefits in long-term outcome and functional improvement require further investigation.

  • revision total knee arthroplasty a comparison of postoperative leg alignment after computer assisted implantation versus the Conventional Technique
    Knee Surgery Sports Traumatology Arthroscopy, 2005
    Co-Authors: L Perlick, Markus Tingart, C Luring, H Bathis, Carsten Perlick, J Grifka
    Abstract:

    Accurate reconstruction of leg alignment is one important factor for long-term survival in total knee arthroplasty (TKA). Recent developments in computer-assisted surgery focused on systems improving TKA. The aim of the study is to compare the results of computer-assisted revision TKA with the Conventional Technique. We hypothize that a significantly better leg alignment and component orientation is achieved when using a navigation system for revision TKA. In a prospective study, two groups of 25 revision TKAs each were operated on using either a CT-free navigation system or the classical surgeon-controlled Technique. The postoperative leg alignment was analysed on long-leg coronal and lateral X-rays. The mechanical limb axis was significantly better in the navigation-based group. Twenty-three patients (92%) in the computer-assisted group had a postoperative leg axis between 3° varus/valgus deviation, while 19 patients (76%) in the Conventional group had a comparable result (p<0.05). Further, significant differences were seen for the coronal orientation of the femoral component. Computer-assisted revision TKA leads to a superior restoration of leg alignment compared with the Conventional Technique. Particularly the real-time presentation of the actual leg axis and the flexion and extension gaps is useful in revision TKA. Potential benefits in long-term outcome and functional improvement require additional investigation.

  • navigation in total knee arthroplasty ct based implantation compared with the Conventional Technique
    Acta Orthopaedica Scandinavica, 2004
    Co-Authors: L Perlick, Markus Tingart, H Bathis, Carsten Perlick, J Grifka
    Abstract:

    Background Exact axial limb alignment in total-knee arthroplasty (TKA) is important for a successful outcome. We evaluated the efficiency of computer-assisted implantation in TKA and compared it wi...

Jeffrey W Milsom - One of the best experts on this subject based on the ideXlab platform.

  • facilitating endoscopic submucosal dissection double balloon endolumenal platform significantly improves dissection time compared with Conventional Technique with video
    Surgical Endoscopy and Other Interventional Techniques, 2019
    Co-Authors: Sam Sharma, Kota Momose, Hisashi Hara, James E East, Kazuki Sumiyama, Kiyokazu Nakajima, Gerd Silbehumer, Jeffrey W Milsom
    Abstract:

    Flexible endoscopes ability to manipulate the intestinal environment is limited. As a result, complex endolumenal procedures are often technically demanding and result in long procedure times, impacting institutional resources. Single- and double-balloon add-on endoscopic devices have been employed throughout the GI tract to facilitate tissue control e.g., small bowel enteroscopy, with recent reports suggesting a possible colonic utility for complex procedures e.g., ESD. Our objective was to objectively analyze the efficacy of a new double-balloon device in performing ESD. Ex vivo—12 simulated colonic lesions were created in porcine rectum using a standard 40 mm diameter template. Two categories were evaluated, standard cap Technique ESD and double-balloon assisted ESD with retraction (ESD-R). Cases were performed sequentially. In vivo—Six, 40 mm lesion ESD-R’s were performed in a porcine model. The primary outcomes of this study were total procedure and dissection times. In ex vivo studies, the median total procedure time with the double-balloon platform was significantly shorter than the traditional ESD Technique (29 ± 18 vs. 57 ± 21 min, p = 0.03). In the in vivo studies, lesions were successfully removed in a mean time of 48 min, with a dissection time of 20 min with no significant complications. Balloon-clip retraction and specimen retrieval capabilities were used in all double-balloon assisted cases. After 6 cases, times were significantly shorter (ex vivo 47 vs. 17 min; in vivo 57 vs. 27 min). We have demonstrated the development of a unique technical ESD method facilitated by a new double-balloon device. Ex and in vivo investigation demonstrated superiority of ESD-R over the Conventional ex vivo method. The DB device provided increased stability, improved visualization and tissue traction, which significantly reduced dissection time. Such an approach may increase safety, improve patient outcomes, and may prevent unnecessary surgeries for benign conditions.

C Luring - One of the best experts on this subject based on the ideXlab platform.

  • minimal invasive and computer assisted total knee replacement compared with the Conventional Technique a prospective randomised trial
    Knee Surgery Sports Traumatology Arthroscopy, 2008
    Co-Authors: C Luring, J Beckmann, J Grifka, L Perlick, P Haibock, Markus Tingart
    Abstract:

    Minimal invasive surgery (MIS) in total knee replacement (TKR) has been favoured by several authors and the industry and is asked for by the patients. Computer assisted surgery (CAS) is proposed to support the surgeon in terms of postoperative leg alignment and implant orientation. To prove the hypothesis that MIS in TKR fastens early rehabilitation compared to the standard approach and that CAS–MIS in TKR improves accuracy in implant position compared to the freehand MIS and freehand standard Technique, we performed a prospective, randomised short-term trial which was approved by the local ethic committee. In total, 90 patients underwent TKR. The Conventional group (n = 30) underwent Conventional TKR, the MIS group (n = 30) underwent MIS–TKR without navigation, the CAS–MIS group (n = 30) underwent TKR using navigation and the MIS approach. Groups were comparable regarding patients’ specific parameters. The length of incision in extension was significantly lower in the MIS (13.2 cm) and CAS–MIS Technique (12.9 cm) compared to the Conventional Technique (17.3 cm) (P < 0.01). Knee Society and WOMAC Score were similar in all three groups after 1, 6 and 12 weeks, no significant differences were seen between groups at any point of time. Postoperative deviation of the mechanical leg axis was significantly better in the CAS–MIS group compared to the Conventional group and the MIS one (P < 0.05). The clinical relevance of our results is that the benefit of the minimal invasive approach in TKR is still not proven and navigation improves postoperative accuracy of leg alignment and component orientation. Our study shows that for the group of patients included there is no statistically significant difference in early rehabilitation between MIS and the Conventional approach based on the Knee Society and WOMAC Score. Using the CAS Technique restoration of leg axis was more accurate.

  • computer assisted total knee arthroplasty versus the Conventional Technique how precise is navigation in clinical routine
    Knee Surgery Sports Traumatology Arthroscopy, 2008
    Co-Authors: Markus Tingart, C Luring, H Bathis, J Beckmann, J Grifka, L Perlick
    Abstract:

    Restoration of the mechanical leg axis and component positioning are crucial factors affecting long-term results in total knee arthroplasty (TKA). In a prospective study, 1,000 patients were operated on either using a CT-free navigation system or the Conventional jig-based Technique. Leg alignment and component orientation were determined on postoperative X-rays. The mechanical leg axis was significantly better in the computer-assisted group (95%, within ±3° varus/valgus) compared to the Conventional group (74%, within ±3° varus/valgus) (P < 0.001). On average, the operating time was increased by 8 min in the computer-assisted group. No significant differences were seen between senior and younger surgeons regarding postoperative leg alignment and operating time. Computer-assisted TKA leads to a more accurate restoration of leg alignment and component orientation compared to the Conventional jig-based Technique. Potential benefits in long-term outcome and functional improvement require further investigation.

  • computer assisted total knee arthroplasty versus the Conventional Technique how precise is navigation in clinical routine
    Knee Surgery Sports Traumatology Arthroscopy, 2008
    Co-Authors: Markus Tingart, C Luring, H Bathis, J Beckmann, J Grifka, L Perlick
    Abstract:

    Restoration of the mechanical leg axis and component positioning are crucial factors affecting long-term results in total knee arthroplasty (TKA). In a prospective study, 1,000 patients were operated on either using a CT-free navigation system or the Conventional jig-based Technique. Leg alignment and component orientation were determined on postoperative X-rays. The mechanical leg axis was significantly better in the computer-assisted group (95%, within +/-3 degrees varus/valgus) compared to the Conventional group (74%, within +/-3 degrees varus/valgus) (P < 0.001). On average, the operating time was increased by 8 min in the computer-assisted group. No significant differences were seen between senior and younger surgeons regarding postoperative leg alignment and operating time. Computer-assisted TKA leads to a more accurate restoration of leg alignment and component orientation compared to the Conventional jig-based Technique. Potential benefits in long-term outcome and functional improvement require further investigation.

  • revision total knee arthroplasty a comparison of postoperative leg alignment after computer assisted implantation versus the Conventional Technique
    Knee Surgery Sports Traumatology Arthroscopy, 2005
    Co-Authors: L Perlick, Markus Tingart, C Luring, H Bathis, Carsten Perlick, J Grifka
    Abstract:

    Accurate reconstruction of leg alignment is one important factor for long-term survival in total knee arthroplasty (TKA). Recent developments in computer-assisted surgery focused on systems improving TKA. The aim of the study is to compare the results of computer-assisted revision TKA with the Conventional Technique. We hypothize that a significantly better leg alignment and component orientation is achieved when using a navigation system for revision TKA. In a prospective study, two groups of 25 revision TKAs each were operated on using either a CT-free navigation system or the classical surgeon-controlled Technique. The postoperative leg alignment was analysed on long-leg coronal and lateral X-rays. The mechanical limb axis was significantly better in the navigation-based group. Twenty-three patients (92%) in the computer-assisted group had a postoperative leg axis between 3° varus/valgus deviation, while 19 patients (76%) in the Conventional group had a comparable result (p<0.05). Further, significant differences were seen for the coronal orientation of the femoral component. Computer-assisted revision TKA leads to a superior restoration of leg alignment compared with the Conventional Technique. Particularly the real-time presentation of the actual leg axis and the flexion and extension gaps is useful in revision TKA. Potential benefits in long-term outcome and functional improvement require additional investigation.

  • alignment in total knee arthroplasty a comparison of computer assisted surgery with the Conventional Technique
    Journal of Bone and Joint Surgery-british Volume, 2004
    Co-Authors: H Bathis, Markus Tingart, C Luring, L Perlick, David Zurakowski, J Grifka
    Abstract:

    Restoration of neutral alignment of the leg is an important factor affecting the long-term results of total knee arthroplasty (TKA). Recent developments in computer-assisted surgery have focused on systems for improving TKA. In a prospective study two groups of 80 patients undergoing TKA had operations using either a computer-assisted navigation system or a Conventional Technique. Alignment of the leg and the orientation of components were determined on post-operative long-leg coronal and lateral films. The mechanical axis of the leg was significantly better in the computer-assisted group (96%, within ±3° varus/valgus) compared with the Conventional group (78%, within ±3° varus/valgus). The coronal alignment of the femoral component was also more accurate in the computer-assisted group. Computer-assisted TKA gives a better correction of alignment of the leg and orientation of the components compared with the Conventional Technique. Potential benefits in the long-term outcome and functional improvement require further investigation.