The Tibial Slope in Patients With Achondroplasia: Its Characterization and Possible Role in Genu Recurvatum Development
BACKGROUND:Genu recurvatum, a posterior resting position of the knee, is a common lower extremity deformity in patients with achondroplasia and has been thought to be secondary to ligamentous laxity. To the best of our knowledge, the role of the tibial slope has not been investigated, and no studies...
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| Veröffentlicht in: | Journal of pediatric orthopaedics 2016-06, Vol.36 (4), p.349-354 |
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| creator | Brooks, Jaysson T Bernholt, David L Tran, Kevin V Ain, Michael C |
| description | BACKGROUND:Genu recurvatum, a posterior resting position of the knee, is a common lower extremity deformity in patients with achondroplasia and has been thought to be secondary to ligamentous laxity. To the best of our knowledge, the role of the tibial slope has not been investigated, and no studies describe the tibial slope in patients with achondroplasia. Our goals were to characterize the tibial slope in children and adults with achondroplasia, explore its possible role in the development of genu recurvatum, and compare the tibial slope in patients with achondroplasia to that in the general population.
METHODS:We reviewed 252 lateral knee radiographs of 130 patients with achondroplasia seen at our clinic from November 2007 through September 2013. Patients were excluded if they had previous lower extremity surgery or radiographs with extreme rotation. We analyzed patient demographics and, on all radiographs, the tibial slope. We then compared the mean tibial slope to norms in the literature. Tibial slopes >90 degrees had an anterior tibial slope and received a positive prefix. Statistical analysis included intraclass and interclass reliability, Pearson correlation coefficient, and the Student t tests (significance, P |
| doi_str_mv | 10.1097/BPO.0000000000000458 |
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METHODS:We reviewed 252 lateral knee radiographs of 130 patients with achondroplasia seen at our clinic from November 2007 through September 2013. Patients were excluded if they had previous lower extremity surgery or radiographs with extreme rotation. We analyzed patient demographics and, on all radiographs, the tibial slope. We then compared the mean tibial slope to norms in the literature. Tibial slopes >90 degrees had an anterior tibial slope and received a positive prefix. Statistical analysis included intraclass and interclass reliability, Pearson correlation coefficient, and the Student t tests (significance, P<0.05).
RESULTS:The overall mean tibial slope for the 252 knees was +1.32±7 degrees, which was significantly more anterior than the normal slopes reported in the literature for adults (7.2 to 10.7 degrees, P=0.0001) and children (10 to 11 degrees, P=0.0001). The Pearson correlation coefficient for mean tibial slope and age showed negative correlations of −0.4011 and −0.4335 for left and right knees, respectively. This anterior tibial slope produces proximal and posterior vector force components, which may shift the knee posteriorly in weightbearing.
CONCLUSIONS:The mean tibial slope is significantly more anterior in patients with achondroplasia than in the general population; however, this difference diminishes as patients’ age. An anterior tibial slope may predispose to a more posterior resting knee position, also known as genu recurvatum.
LEVEL OF EVIDENCE:Level IV—retrospective case series.</description><identifier>ISSN: 0271-6798</identifier><identifier>EISSN: 1539-2570</identifier><identifier>DOI: 10.1097/BPO.0000000000000458</identifier><identifier>PMID: 26114241</identifier><language>eng</language><publisher>United States: Copyright Wolters Kluwer Health, Inc. All rights reserved</publisher><subject>Achondroplasia - diagnostic imaging ; Achondroplasia - physiopathology ; Adolescent ; Adult ; Aged ; Child ; Child, Preschool ; Female ; Humans ; Infant ; Knee Joint - abnormalities ; Knee Joint - diagnostic imaging ; Knee Joint - physiopathology ; Lower Extremity Deformities, Congenital - diagnostic imaging ; Lower Extremity Deformities, Congenital - physiopathology ; Male ; Middle Aged ; Radiography ; Reproducibility of Results ; Retrospective Studies ; Rotation ; Tibia - abnormalities ; Tibia - diagnostic imaging ; Weight-Bearing - physiology ; Young Adult</subject><ispartof>Journal of pediatric orthopaedics, 2016-06, Vol.36 (4), p.349-354</ispartof><rights>Copyright © 2016 Wolters Kluwer Health, Inc. All rights reserved.</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c3568-1e4d829b147cdafd48766b2b9d05cbea0cbce1d77570d38232cfb640881c6be03</citedby><cites>FETCH-LOGICAL-c3568-1e4d829b147cdafd48766b2b9d05cbea0cbce1d77570d38232cfb640881c6be03</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,776,780,27901,27902</link.rule.ids><backlink>$$Uhttps://www.ncbi.nlm.nih.gov/pubmed/26114241$$D View this record in MEDLINE/PubMed$$Hfree_for_read</backlink></links><search><creatorcontrib>Brooks, Jaysson T</creatorcontrib><creatorcontrib>Bernholt, David L</creatorcontrib><creatorcontrib>Tran, Kevin V</creatorcontrib><creatorcontrib>Ain, Michael C</creatorcontrib><title>The Tibial Slope in Patients With Achondroplasia: Its Characterization and Possible Role in Genu Recurvatum Development</title><title>Journal of pediatric orthopaedics</title><addtitle>J Pediatr Orthop</addtitle><description>BACKGROUND:Genu recurvatum, a posterior resting position of the knee, is a common lower extremity deformity in patients with achondroplasia and has been thought to be secondary to ligamentous laxity. To the best of our knowledge, the role of the tibial slope has not been investigated, and no studies describe the tibial slope in patients with achondroplasia. Our goals were to characterize the tibial slope in children and adults with achondroplasia, explore its possible role in the development of genu recurvatum, and compare the tibial slope in patients with achondroplasia to that in the general population.
METHODS:We reviewed 252 lateral knee radiographs of 130 patients with achondroplasia seen at our clinic from November 2007 through September 2013. Patients were excluded if they had previous lower extremity surgery or radiographs with extreme rotation. We analyzed patient demographics and, on all radiographs, the tibial slope. We then compared the mean tibial slope to norms in the literature. Tibial slopes >90 degrees had an anterior tibial slope and received a positive prefix. Statistical analysis included intraclass and interclass reliability, Pearson correlation coefficient, and the Student t tests (significance, P<0.05).
RESULTS:The overall mean tibial slope for the 252 knees was +1.32±7 degrees, which was significantly more anterior than the normal slopes reported in the literature for adults (7.2 to 10.7 degrees, P=0.0001) and children (10 to 11 degrees, P=0.0001). The Pearson correlation coefficient for mean tibial slope and age showed negative correlations of −0.4011 and −0.4335 for left and right knees, respectively. This anterior tibial slope produces proximal and posterior vector force components, which may shift the knee posteriorly in weightbearing.
CONCLUSIONS:The mean tibial slope is significantly more anterior in patients with achondroplasia than in the general population; however, this difference diminishes as patients’ age. An anterior tibial slope may predispose to a more posterior resting knee position, also known as genu recurvatum.
LEVEL OF EVIDENCE:Level IV—retrospective case series.</description><subject>Achondroplasia - diagnostic imaging</subject><subject>Achondroplasia - physiopathology</subject><subject>Adolescent</subject><subject>Adult</subject><subject>Aged</subject><subject>Child</subject><subject>Child, Preschool</subject><subject>Female</subject><subject>Humans</subject><subject>Infant</subject><subject>Knee Joint - abnormalities</subject><subject>Knee Joint - diagnostic imaging</subject><subject>Knee Joint - physiopathology</subject><subject>Lower Extremity Deformities, Congenital - diagnostic imaging</subject><subject>Lower Extremity Deformities, Congenital - physiopathology</subject><subject>Male</subject><subject>Middle Aged</subject><subject>Radiography</subject><subject>Reproducibility of Results</subject><subject>Retrospective Studies</subject><subject>Rotation</subject><subject>Tibia - abnormalities</subject><subject>Tibia - diagnostic imaging</subject><subject>Weight-Bearing - physiology</subject><subject>Young Adult</subject><issn>0271-6798</issn><issn>1539-2570</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2016</creationdate><recordtype>article</recordtype><sourceid>EIF</sourceid><recordid>eNp9kE1P3DAQhq2qqCy0_6CqfOwlYDtO7HCDpXxISKxgqx4jf8wqbp14sRNW9NfjdgEhDsxlDvPMO5oHoa-UHFDSiMOTxfUBeV28kh_QjFZlU7BKkI9oRpigRS0auYv2UvpNCBUlLz-hXVZTyhmnM7RZdoCXTjvl8a0Pa8BuwAs1OhjGhH-5scPHpguDjWHtVXLqCF_mwbxTUZkRovub2TBgNVi8CCk57QHfBP8_5xyGCd-AmeK9Gqcen8I95Bt9zv6MdlbKJ_jy1PfRz7Mfy_lFcXV9fjk_vipMWdWyoMCtZI2mXBirVpZLUdea6caSymhQxGgD1AqRH7alZCUzK11zIiU1tQZS7qPv29x1DHcTpLHtXTLgvRogTKmlQgouhGQ8o3yLmpgfibBq19H1Kj60lLT_lLdZeftWeV779nRh0j3Yl6VnxxmQW2ATfDaW_vhpA7HtQPmxez_7EfyVjmc</recordid><startdate>201606</startdate><enddate>201606</enddate><creator>Brooks, Jaysson T</creator><creator>Bernholt, David L</creator><creator>Tran, Kevin V</creator><creator>Ain, Michael C</creator><general>Copyright Wolters Kluwer Health, Inc. All rights reserved</general><scope>CGR</scope><scope>CUY</scope><scope>CVF</scope><scope>ECM</scope><scope>EIF</scope><scope>NPM</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7X8</scope></search><sort><creationdate>201606</creationdate><title>The Tibial Slope in Patients With Achondroplasia: Its Characterization and Possible Role in Genu Recurvatum Development</title><author>Brooks, Jaysson T ; Bernholt, David L ; Tran, Kevin V ; Ain, Michael C</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c3568-1e4d829b147cdafd48766b2b9d05cbea0cbce1d77570d38232cfb640881c6be03</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2016</creationdate><topic>Achondroplasia - diagnostic imaging</topic><topic>Achondroplasia - physiopathology</topic><topic>Adolescent</topic><topic>Adult</topic><topic>Aged</topic><topic>Child</topic><topic>Child, Preschool</topic><topic>Female</topic><topic>Humans</topic><topic>Infant</topic><topic>Knee Joint - abnormalities</topic><topic>Knee Joint - diagnostic imaging</topic><topic>Knee Joint - physiopathology</topic><topic>Lower Extremity Deformities, Congenital - diagnostic imaging</topic><topic>Lower Extremity Deformities, Congenital - physiopathology</topic><topic>Male</topic><topic>Middle Aged</topic><topic>Radiography</topic><topic>Reproducibility of Results</topic><topic>Retrospective Studies</topic><topic>Rotation</topic><topic>Tibia - abnormalities</topic><topic>Tibia - diagnostic imaging</topic><topic>Weight-Bearing - physiology</topic><topic>Young Adult</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Brooks, Jaysson T</creatorcontrib><creatorcontrib>Bernholt, David L</creatorcontrib><creatorcontrib>Tran, Kevin V</creatorcontrib><creatorcontrib>Ain, Michael C</creatorcontrib><collection>Medline</collection><collection>MEDLINE</collection><collection>MEDLINE (Ovid)</collection><collection>MEDLINE</collection><collection>MEDLINE</collection><collection>PubMed</collection><collection>CrossRef</collection><collection>MEDLINE - Academic</collection><jtitle>Journal of pediatric orthopaedics</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Brooks, Jaysson T</au><au>Bernholt, David L</au><au>Tran, Kevin V</au><au>Ain, Michael C</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>The Tibial Slope in Patients With Achondroplasia: Its Characterization and Possible Role in Genu Recurvatum Development</atitle><jtitle>Journal of pediatric orthopaedics</jtitle><addtitle>J Pediatr Orthop</addtitle><date>2016-06</date><risdate>2016</risdate><volume>36</volume><issue>4</issue><spage>349</spage><epage>354</epage><pages>349-354</pages><issn>0271-6798</issn><eissn>1539-2570</eissn><abstract>BACKGROUND:Genu recurvatum, a posterior resting position of the knee, is a common lower extremity deformity in patients with achondroplasia and has been thought to be secondary to ligamentous laxity. To the best of our knowledge, the role of the tibial slope has not been investigated, and no studies describe the tibial slope in patients with achondroplasia. Our goals were to characterize the tibial slope in children and adults with achondroplasia, explore its possible role in the development of genu recurvatum, and compare the tibial slope in patients with achondroplasia to that in the general population.
METHODS:We reviewed 252 lateral knee radiographs of 130 patients with achondroplasia seen at our clinic from November 2007 through September 2013. Patients were excluded if they had previous lower extremity surgery or radiographs with extreme rotation. We analyzed patient demographics and, on all radiographs, the tibial slope. We then compared the mean tibial slope to norms in the literature. Tibial slopes >90 degrees had an anterior tibial slope and received a positive prefix. Statistical analysis included intraclass and interclass reliability, Pearson correlation coefficient, and the Student t tests (significance, P<0.05).
RESULTS:The overall mean tibial slope for the 252 knees was +1.32±7 degrees, which was significantly more anterior than the normal slopes reported in the literature for adults (7.2 to 10.7 degrees, P=0.0001) and children (10 to 11 degrees, P=0.0001). The Pearson correlation coefficient for mean tibial slope and age showed negative correlations of −0.4011 and −0.4335 for left and right knees, respectively. This anterior tibial slope produces proximal and posterior vector force components, which may shift the knee posteriorly in weightbearing.
CONCLUSIONS:The mean tibial slope is significantly more anterior in patients with achondroplasia than in the general population; however, this difference diminishes as patients’ age. An anterior tibial slope may predispose to a more posterior resting knee position, also known as genu recurvatum.
LEVEL OF EVIDENCE:Level IV—retrospective case series.</abstract><cop>United States</cop><pub>Copyright Wolters Kluwer Health, Inc. All rights reserved</pub><pmid>26114241</pmid><doi>10.1097/BPO.0000000000000458</doi><tpages>6</tpages></addata></record> |
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| subjects | Achondroplasia - diagnostic imaging Achondroplasia - physiopathology Adolescent Adult Aged Child Child, Preschool Female Humans Infant Knee Joint - abnormalities Knee Joint - diagnostic imaging Knee Joint - physiopathology Lower Extremity Deformities, Congenital - diagnostic imaging Lower Extremity Deformities, Congenital - physiopathology Male Middle Aged Radiography Reproducibility of Results Retrospective Studies Rotation Tibia - abnormalities Tibia - diagnostic imaging Weight-Bearing - physiology Young Adult |
| title | The Tibial Slope in Patients With Achondroplasia: Its Characterization and Possible Role in Genu Recurvatum Development |
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