Dataset Information

Extrinsic Muscle Forces Affect Ankle Loading Before and After Total Ankle Arthroplasty.

ABSTRACT:

Background

Joint loading conditions have an effect on the development and management of ankle osteoarthritis and on aseptic loosening after total ankle arthroplasty (TAA). Apart from body weight, compressive forces induced by muscle action may affect joint loading. However, few studies have evaluated the influence of individual muscles on the intraarticular pressure distribution in the ankle.

Question/purposes

The purpose of this study was to measure intraarticular pressure distribution and, in particular, (1) to quantify the effect of individual muscle action on peak-pressure magnitude; and (2) to identify the location of the center of pressure in the weightbearing native ankles and ankles that had TAA.

Methods

Peak pressure and intraarticular center of pressure were quantified during force alterations of four muscle groups (peronei, tibialis anterior, tibialis posterior, and triceps surae) in 10 cadaveric feet. The pressure was measured with a pressure sensitive array before and after implantation of a three-component mobile-bearing TAA prosthesis. Linear mixed-effects models were calculated and the y-intercept (b0) and the slope (b1) of the regression were used to quantify the size of the effect.

Results

Mean maximum peak pressures of 2 MPa (± 2.6 MPa) and 6.2 MPa (± 3.6 MPa) were measured for the native and TAA joint respectively. The triceps surae greatly affect the magnitude of peak pressure in the native ankle (slope b1 = 0.174; p = 0.001) and TAA joint (slope b1 = 0.416; p = 0.001). Furthermore, the force of most muscles caused a posterior and lateral shift of the center of pressure in both conditions.

Conclusions

Our results suggest that muscle force production has the potential to alter the pressure distribution in the native ankles and those with and TAA.

Clinical relevance

Our study results help us to understand the effect of muscle forces on joint loading conditions which could be used in muscle training strategies and the design of better prosthetic components. Physical therapy or guided exercises may provide the potential to relieve areas in the joint that show signs of early osteoarthritis or reduce the contact stress on prosthetic components, potentially reducing the risk of TAA failure attributable to wear.

SUBMITTER: Natsakis T

PROVIDER: S-EPMC4523507 | biostudies-literature | 2015 Sep

REPOSITORIES: biostudies-literature

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Publications

Extrinsic Muscle Forces Affect Ankle Loading Before and After Total Ankle Arthroplasty.

Natsakis Tassos T Burg Josefien J Dereymaeker Greta G Vander Sloten Jos J Jonkers Ilse I

Clinical orthopaedics and related research 20150516 9

<h4>Background</h4>Joint loading conditions have an effect on the development and management of ankle osteoarthritis and on aseptic loosening after total ankle arthroplasty (TAA). Apart from body weight, compressive forces induced by muscle action may affect joint loading. However, few studies have evaluated the influence of individual muscles on the intraarticular pressure distribution in the ankle.<h4>Question/purposes</h4>The purpose of this study was to measure intraarticular pressure distri ...[more]

PMID: 25981714

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Project description:BackgroundRestoring the joint line is an important principle in total knee arthroplasty. However, the effect of joint line level on patient outcomes after total ankle arthroplasty (TAA) remains unclear, as there is no established method for measuring ankle joint level in TAA. The objective of this study was to develop a reliable radiographic ankle joint line measurement method and to compare ankle joint line level measured pre-TAA, post-TAA, and in nonarthritic ankles.MethodsA total of 112 radiographic sets were analyzed. Each set included weightbearing anteroposterior radiographs of the operative ankle taken preoperatively, 1-year postoperatively, and of the contralateral ankle. Measurements of vertical intermalleolar distance (VIMD) and vertical joint line distance (VJLD) at pre-TAA, post-TAA, and of the contralateral ankle were recorded by 2 authors on 2 separate occasions. The ratio of VJLD to VIMD was defined as the joint line height ratio (JLHR). Reliability of measurements and correlation between VIMD and VJLD were assessed. Pre-TAA, nonarthritic contralateral ankle, and post-TAA JLHR were compared and considered significantly different if P <.05.ResultsThe inter- and intrarater reliability of radiographic measurements was excellent (r > 0.9). There were strong positive correlations of VIMD and VJLD, r = 0.809 (pre-TAA)/0.756 (post-TAA), P < .001. Mean (SD) pre-TAA, nonarthritic contralateral ankle, and post-TAA JLHRs were 1.54 (0.31), 1.39 (0.26), and 1.62 (0.49), respectively. Pre- and post-TAA JLHRs were significantly higher compared to the nonarthritic contralateral ankle (P < .05). JHLR was not significantly different between pre- and post-TAA (P = .15).ConclusionThe JLHR was reliable and could be a clinically applicable method for assessing ankle joint line level in patients undergoing TAA. End-stage ankle arthritis demonstrated elevated joint line level compared with nonarthritic ankles, and the joint line level post-TAA remained elevated compared with nonarthritic ankles. Further studies are needed to understand the effect of joint line elevation on clinical outcomes after TAA.Level of evidenceLevel III, retrospective comparative study.

Project description:Accurate positioning of the total ankle arthroplasty implant components with the absence of any hindfoot deformity does not preclude the development of bony impingement. In cases of ankle stiffness after total ankle arthroplasty, the usual limitation is in dorsiflexion. If triceps surae contracture is excluded or persistent restriction remains in ankle dorsiflexion after gastrocnemius recession or tendo-Achilles lengthening, posterior ankle capsulectomy, debridement of posterior ankle gutter, and release of the deep posterior deltoid ligament and the posterior talofibular ligament are indicated. In this Technical Note, the technical details of endoscopic posterior ankle decompression and release after total ankle arthroplasty are described. Technique Video Video 1 Endoscopic posterior ankle decompression and release after total ankle arthroplasty of the left ankle. The patient is in the prone position. Posteromedial portal is the viewing portal and posterolateral portal is the working portal. The flexor hallucis longus (FHL) tendon is exposed. The arthroscope is switched to the posterolateral portal and the posterolateral ankle capsule is resected with arthroscopic instruments via the posteromedial portal. The FHL tendon is pushed medially by the instruments to facilitate resection of the more medial posterior ankle capsule. The arthroscope is switched back to the posteromedial portal and the most lateral part of the posterior ankle capsule is resected with arthroscopic shaver and radiofrequency wand via the posterolateral portal. Then, the FHL tendon is looped with a vascular sling via the posterolateral portal and the tendon is retracted laterally. The medial part of the posterior ankle capsule is resected with arthroscopic instruments via the posteromedial portal. The fibrous tissue of the posteromedial ankle gutter is also resected. The arthroscope is switched to the posteromedial portal and the fibrous tissue of the posterolateral ankle gutter is resected. The scarred posterolateral ankle ligamentous structure and fibrous band is released from its calcaneal insertion. The arthroscope is switched back to the posterolateral portal and the scarred posteromedial ankle ligamentous structure and fibrous band is carefully cut by a No. 15 scalpel with the cutting blade facing laterally.

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Project description:BackgroundDespite limited evidence, peripheral vascular disease is often cited as a contraindication for total ankle arthroplasty. The purpose of our study was to identify whether peripheral vascular disease in patients undergoing total ankle arthroplasty increased the rate of infection, postoperative irrigation and debridement, or failure of the implant.MethodsThe PearlDiver Database was used to identify Medicare patients who underwent a total ankle arthroplasty from 2005 to 2014. These data were then analyzed for postoperative infections within 90 days, subsequent irrigation and debridements, and failure of total ankle arthroplasties. A diagnosis of preoperative peripheral vascular disease only included those patients who had peripheral vascular disease as an ICD-9 diagnosis code and underwent a preoperative lower extremity angiogram prior to total ankle arthroplasty. Medical comorbidities were identified using ICD-9 diagnosis codes. Three multivariable logistic regression models were then developed in order to identify risk factors associated with postoperative infections and failure after total ankle arthroplasty.ResultsA total of 10 698 Medicare patients who underwent a primary total ankle arthroplasty were identified. There were 334 patients who had a postoperative infection within 90 days of their total ankle arthroplasty, and 95 of those patients required an irrigation and debridement. Regression analysis demonstrated that patients with peripheral vascular disease had the greatest risk of developing a postoperative infection within 90 days (OR 2.85, P < .01), requiring an irrigation and debridement postoperatively (OR 4.87, P < .001), and having a total ankle arthroplasty failure at any time point postoperatively (OR 2.51, P < .001).ConclusionsOur study suggests that preoperative peripheral vascular disease is a significant risk factor for an acute postoperative infection, postoperative irrigation and debridement, and failure of the implant in Medicare patients undergoing a total ankle arthroplasty.Level of evidenceLevel III, therapeutic.

Dataset Information

Extrinsic Muscle Forces Affect Ankle Loading Before and After Total Ankle Arthroplasty.

Background

Question/purposes

Methods

Results

Conclusions

Clinical relevance

Publications

Extrinsic Muscle Forces Affect Ankle Loading Before and After Total Ankle Arthroplasty.

Similar Datasets

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