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Lee J, El-Daou H, Alkoheji M, Carlos A, Di Mascio L, Amis A. Ligamentous and capsular restraints to anterior-posterior and superior-inferior laxity of the acromioclavicular joint: a biomechanical study. J Shoulder Elbow Surg 2021; 30:1251-1256. [PMID: 33010434 DOI: 10.1016/j.jse.2020.09.006] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/01/2020] [Revised: 09/01/2020] [Accepted: 09/08/2020] [Indexed: 02/01/2023]
Abstract
BACKGROUND Approximately 9% of shoulder girdle injuries involve the acromioclavicular joint (ACJ). There is no clear gold standard or consensus on surgical management of these injuries, in part perpetuated by our incomplete understanding of native ACJ biomechanics. We have therefore conducted a biomechanical study to assess the stabilizing structures of the ACJ in superior-inferior (SI) translation and anterior-posterior (AP) translation. METHODS Twenty fresh frozen cadaveric specimens were prepared and mounted onto a robotic arm. The intact native joint was tested in SI translation and AP translation under a 50-N displacing force. Each specimen was retested after sectioning of its stabilizing structures in the following order: investing fascia, ACJ capsular ligaments, trapezoid ligament, and conoid ligament. Their contributions to resisting ACJ displacements were calculated. RESULTS In the intact native ACJ, mean anterior displacement of the clavicle was 7.9 ± 4.3 mm, mean posterior displacement was 7.2 ± 2.6 mm, mean superior displacement was 5.8 ± 3.0 mm, and mean inferior displacement was 3.6 ± 2.6 mm. The conoid ligament was the primary stabilizer of superior displacement (45.6%). The ACJ capsular ligament was the primary stabilizer of inferior displacement (33.8%). The capsular ligament and conoid ligament contributed equally to anterior stability, with rates of 23% and 25.2%, respectively. The capsular ligament was the primary contributor to posterior stability (38.4%). CONCLUSION The conoid ligament is the primary stabilizer of superior displacement of the clavicle at the ACJ and contributes significantly to AP stability. Consideration should be given to reconstruction of the ACJ capsular ligament for complete AP stability in high-grade and horizontally unstable ACJ injuries.
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Affiliation(s)
- Jillian Lee
- Department of Orthopaedics, The Royal London Hospital, Barts Health NHS Trust, London, UK.
| | - Hadi El-Daou
- Biomechanics Group, Department of Mechanical Engineering, Imperial College London, London, UK
| | - Mohamed Alkoheji
- Department of Orthopaedics, The Royal London Hospital, Barts Health NHS Trust, London, UK
| | - Adrian Carlos
- Department of Orthopaedics, The Royal London Hospital, Barts Health NHS Trust, London, UK
| | - Livio Di Mascio
- Department of Orthopaedics, The Royal London Hospital, Barts Health NHS Trust, London, UK
| | - Andrew Amis
- Biomechanics Group, Department of Mechanical Engineering, Imperial College London, London, UK
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Acromioclavicular joint reconstruction implants have differing ability to restore horizontal and vertical plane stability. Knee Surg Sports Traumatol Arthrosc 2021; 29:3902-3909. [PMID: 34436636 PMCID: PMC8595167 DOI: 10.1007/s00167-021-06700-x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/28/2021] [Accepted: 08/11/2021] [Indexed: 11/02/2022]
Abstract
PURPOSE Persistent acromioclavicular joint (ACJ) instability following high grade injuries causes significant symptoms. The importance of horizontal plane stability is increasingly recognised. There is little evidence of the ability of current implant methods to restore native ACJ stability in the vertical and horizontal planes. The purpose of this work was to measure the ability of three implant reconstructions to restore native ACJ stability. METHODS Three groups of nine fresh-frozen shoulders each were mounted into a robotic testing system. The scapula was stationary and the robot displaced the clavicle to measure native anterior, posterior, superior and inferior (A, P, S, I) stability at 50 N force. The ACJ capsule, conoid and trapezoid ligaments were transected and the ACJ was reconstructed using one of three commercially available systems. Two systems (tape loop + screw and tape loop + button) wrapped a tape around the clavicle and coracoid, the third system (sutures + buttons) passed directly through tunnels in the clavicle and coracoid. The stabilities were remeasured. The data for A, P, S, I stability and ranges of A-P and S-I stability were analyzed by ANOVA and repeated-measures Student t tests with Bonferroni correction, to contrast each reconstruction stability versus the native ACJ data for that set of nine specimens, and examined contrasts among the reconstructions. RESULTS All three reconstructions restored the range of A-P stability to that of the native ACJ. However, the coracoid loop devices shifted the clavicle anteriorly. For S-I stability, only the sutures + buttons reconstruction did not differ significantly from native ligament restraint. CONCLUSIONS Only the sutures + buttons reconstruction, that passed directly through tunnels in the clavicle and coracoid, restored all stability measures (A, P, S, I) to the native values, while the tape implants wrapped around the bones anteriorised the clavicle. These findings show differing abilities among reconstructions to restore native stability in horizontal and vertical planes. (300 words).
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Athwal KK, Willinger L, Manning W, Deehan D, Amis AA. A constrained-condylar fixed-bearing total knee arthroplasty is stabilised by the medial soft tissues. Knee Surg Sports Traumatol Arthrosc 2021; 29:659-667. [PMID: 32322947 PMCID: PMC7892729 DOI: 10.1007/s00167-020-05995-6] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/17/2019] [Accepted: 04/10/2020] [Indexed: 01/20/2023]
Abstract
PURPOSE Revision constrained-condylar total knee arthroplasty (CCK-TKA) is often used to provide additional mechanical constraint after failure of a primary TKA. However, it is unknown how much this translates to a reliance on soft-tissue support. The aim of this study was therefore to compare the laxity of a native knee to the CCK-TKA implanted state and quantify how medial soft-tissues stabilise the knee following CCK-TKA. METHODS Ten intact cadaveric knees were tested in a robotic system at 0°, 30°, 60° and 90° flexion with ± 90 N anterior-posterior force, ± 8 Nm varus-valgus and ± 5 Nm internal-external torques. A fixed-bearing CCK-TKA was implanted and the laxity tests were repeated with the soft tissues intact and after sequential cutting. The deep and superficial medial collateral ligaments (dMCL, sMCL) and posteromedial capsule (PMC) were sequentially transected and the percentage contributions of each structure to restraining the applied loads were calculated. RESULTS Implanting a CCK-TKA did not alter anterior-posterior laxity from that of the original native knee, but it significantly decreased internal-external and varus-valgus rotational laxity (p < 0.05). Post CCK-TKA, the sMCL restrained 34% of the tibial displacing load in anterior drawer, 16% in internal rotation, 17% in external rotation and 53% in valgus, across the flexion angles tested. The dMCL restrained 11% of the valgus rotation moment. CONCLUSIONS With a fully-competent sMCL in-vitro, a fixed-bearing CCK-TKA knee provided more rotational constraint than the native knee. The robotic test data showed that both the soft-tissues and the semi-constrained implant restrained rotational knee laxity. Therefore, in clinical practice, a fixed-bearing CCK-TKA knee could be indicated for use in a knee with lax, less-competent medial soft tissues. LEVEL OF EVIDENCE Controlled laboratory study.
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Affiliation(s)
- Kiron K Athwal
- Department of Mechanical Engineering, Imperial College London, Exhibition Road, London, SW7 2AZ, UK
| | - Lukas Willinger
- Department of Mechanical Engineering, Imperial College London, Exhibition Road, London, SW7 2AZ, UK
| | - William Manning
- Department of Orthopaedic Surgery, Newcastle Freeman University Hospital, Newcastle, UK
| | - David Deehan
- Department of Orthopaedic Surgery, Newcastle Freeman University Hospital, Newcastle, UK
| | - Andrew A Amis
- Department of Mechanical Engineering, Imperial College London, Exhibition Road, London, SW7 2AZ, UK.
- Musculoskeletal Surgery Group, Department of Surgery and Cancer, Imperial College London School of Medicine, London, UK.
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Cheng X, Wang Z, Zhang Y, Wang M, Zhang X. Tightening medial collateral ligament during total knee arthroplasty for patients with fixed valgus deformity: A novel technique. J Orthop Surg (Hong Kong) 2020; 27:2309499019834695. [PMID: 30862275 DOI: 10.1177/2309499019834695] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
BACKGROUND This study aimed to explore a new surgical technique for gap balance by tightening the medial collateral ligament (MCL) in total knee arthroplasty (TKA) in patients with fixed valgus deformity. MATERIALS AND METHODS A prospective analysis was performed on 15 patients (16 knees) with a fixed valgus deformity that was corrected by tightening the MCL during TKA. A single surgeon performed all the 16 TKAs using nonconstrained posterior substituting implant, with two knees treated with long-stem tibial prosthesis. Clinical scores, knee stability, and radiographic evaluations were recorded preoperatively and postoperatively. RESULTS Complete weight-bearing could be carried out under the protection of the brace postoperatively. At the third month after surgery, X-rays showed the brace was not worn. The mean follow-up was 26.6 months (range 12-42 months). The average preoperative mechanical axis was 15.4 ± 2.3° (range 11-25°), and postoperatively it was 0.6 ± 0.1° (range 0-2°). No complication relative to the technique occurred. CONCLUSION This new surgical technique has demonstrated excellent early clinical results and can be a good supplement for fixed valgus knee arthroplasty. Level of Evidence: III.
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Affiliation(s)
- Xingwang Cheng
- Department of Orthopedics, Xinqiao Hospital, Army Medical University, Chongqing, China
| | - Zhibing Wang
- Department of Orthopedics, Xinqiao Hospital, Army Medical University, Chongqing, China
| | - Yuan Zhang
- Department of Orthopedics, Xinqiao Hospital, Army Medical University, Chongqing, China
| | - Min Wang
- Department of Orthopedics, Xinqiao Hospital, Army Medical University, Chongqing, China
| | - Xia Zhang
- Department of Orthopedics, Xinqiao Hospital, Army Medical University, Chongqing, China
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Sappey-Marinier E, White N, Gaillard R, Cheze L, Servien E, Neyret P, Lustig S. Increased valgus laxity in flexion with greater tibial resection depth following total knee arthroplasty. Knee Surg Sports Traumatol Arthrosc 2019; 27:1450-1455. [PMID: 29846753 DOI: 10.1007/s00167-018-4988-1] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/10/2017] [Accepted: 05/15/2018] [Indexed: 12/15/2022]
Abstract
PURPOSE Soft tissue balancing is of central importance to outcome following total knee arthroplasty (TKA). However, there are lack of data analysing the effect of tibial bone cut thickness on valgus laxity. A cadaveric study was undertaken to assess the biomechanical consequences of tibial resection depth on through range knee joint valgus stability. We aimed to establish a maximum tibial resection depth, beyond which medial collateral ligament balancing becomes challenging, and a constrained implant should be considered. METHODS Eleven cadaveric specimens were included for analysis. The biomechanical effects of increasing tibial resection were studied, with bone cuts made at 6, 10, 14, 18 and 24 mm from the lateral tibial articular surface. A computer navigation system was used to perform the tibial resection and to measure the valgus laxity resulting from a torque of 10 Nm. Measurements were taken in four knee positions: 0° or extension, 30°, 60° and 90° of flexion. Intra-observer reliability was assessed. A minimum sample size of eight cadavers was necessary. Statistical analysis was performed using a nonparametric Spearman's ranking correlation matrix at the different stages: in extension, at 30°, 60° and 90° of knee flexion. Significance was set at p < 0.05. RESULTS There was no macroscopic injury to the dMCL or sMCL in any of the specimens during tibial resection. There was no significant correlation found between the degree of valgus laxity and the thickness of the tibial cut with the knee in extension. There was a statistically significant correlation between valgus laxity and the thickness of the tibial cut in all other knee flexion positions: 30° (p < 0.0001), 60° (p < 0.001) and 90° (p < 0.0001). We identified greater than 5° of valgus laxity, at 90° of knee flexion, after a tibial resection of 14 mm. CONCLUSION Increased tibial resection depth is associated with significantly greater valgus laxity when tested in positions from 30° to 90° of flexion, despite stability in extension. Greater than 5° of laxity was identified with a tibial resection of 14 mm. When a tibial bone cut of 14 mm or greater is necessary, as may occur with severe preoperative coronal plane deformity, it is recommended to consider the use of a constrained knee prosthesis.
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Affiliation(s)
- E Sappey-Marinier
- Centre Albert Trillat, Orthopaedic Surgery, Croix-Rousse Hospital, Lyon, France
| | - N White
- Centre Albert Trillat, Orthopaedic Surgery, Croix-Rousse Hospital, Lyon, France
| | - R Gaillard
- Univ Lyon, Université Claude Bernard Lyon 1, IFSTTAR, LBMC UMR_T9406, 69622, Lyon, France
| | - L Cheze
- Univ Lyon, Université Claude Bernard Lyon 1, IFSTTAR, LBMC UMR_T9406, 69622, Lyon, France
| | - E Servien
- Centre Albert Trillat, Orthopaedic Surgery, Croix-Rousse Hospital, Lyon, France
| | - P Neyret
- Centre Albert Trillat, Orthopaedic Surgery, Croix-Rousse Hospital, Lyon, France
| | - S Lustig
- Centre Albert Trillat, Orthopaedic Surgery, Croix-Rousse Hospital, Lyon, France.
- Univ Lyon, Université Claude Bernard Lyon 1, IFSTTAR, LBMC UMR_T9406, 69622, Lyon, France.
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Athwal KK, Milner PE, Bellier G, Amis AA. Posterior capsular release is a biomechanically safe procedure to perform in total knee arthroplasty. Knee Surg Sports Traumatol Arthrosc 2019; 27:1587-1594. [PMID: 30094498 PMCID: PMC6527529 DOI: 10.1007/s00167-018-5094-0] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/21/2018] [Accepted: 08/03/2018] [Indexed: 01/25/2023]
Abstract
PURPOSE Surgeons may attempt to strip the posterior capsule from its femoral attachment to overcome flexion contracture in total knee arthroplasty (TKA); however, it is unclear if this impacts anterior-posterior (AP) laxity of the implanted knee. The aim of the study was to investigate the effect of posterior capsular release on AP laxity in TKA, and compare this to the restraint from the posterior cruciate ligament (PCL). METHODS Eight cadaveric knees were mounted in a six degree of freedom testing rig and tested at 0°, 30°, 60° and 90° flexion with ± 150 N AP force, with and without a 710 N axial compressive load. After the native knee was tested, a deep dished cruciate-retaining TKA was implanted and the tests were repeated. The PCL was then cut, followed by releasing the posterior capsule using a curved osteotome. RESULTS With 0 N axial load applied, cutting the PCL as well as releasing the posterior capsule significantly increased posterior laxity compared to the native knee at all flexion angles, and CR TKA states at 30°, 60° and 90° (p < 0.05). However, no significant increase in laxity was found between cutting the PCL and subsequent PostCap release (n.s.). In anterior drawer, there was a significant increase of 1.4 mm between cutting the PCL and PostCap release at 0°, but not at any other flexion angles (p = 0.021). When a 710 N axial load was applied, there was no significant difference in anterior or posterior translation across the different knee states (n.s.). CONCLUSIONS Posterior capsular release only caused a small change in AP laxity compared to cutting the PCL and, therefore, may not be considered detrimental to overall AP stability if performed during TKA surgery. LEVEL OF EVIDENCE Controlled laboratory study.
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Affiliation(s)
- K K Athwal
- Department of Mechanical Engineering, Imperial College London, Exhibition Road, London, SW7 2AZ, UK
| | - P E Milner
- Department of Mechanical Engineering, Imperial College London, Exhibition Road, London, SW7 2AZ, UK
| | - G Bellier
- Cabinet Goethe, 23 Avenue Niel, Paris, 75017, France
| | - Andrew A Amis
- Department of Mechanical Engineering, Imperial College London, Exhibition Road, London, SW7 2AZ, UK.
- Musculoskeletal Surgery Group, Department of Surgery and Cancer, Imperial College London School of Medicine, Charing Cross Hospital, W6 8RF, London, UK.
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