Title |
Factors of patellar instability: An anatomic radiographic study
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Published in |
Knee Surgery, Sports Traumatology, Arthroscopy, March 1994
|
DOI | 10.1007/bf01552649 |
Pubmed ID | |
Authors |
H. Dejour, G. Walch, L. Nove‐Josserand, Ch. Guier |
Abstract |
We analyzed the radiographs and computed tomography (CT) scans of 143 knees operated on for symptomatic patellar instability and 67 contralateral asymptomatic knees, together with 190 control knee radiographs and 27 control knee scans, to determine the factors affecting patellar instability. Four factors were relevant in knees with symptomatic patellar instability: (1) Trochlear dysplasia (85%), as defined by the crossing sign (96%) and quantitatively expressed by the trochlear bump, pathological above 3 mm or more (66%), and the trochlear depth, pathologic at 4 mm or less. (2) Quadriceps dysplasia (83%), defined a present when the patellar tilt in extension is more than 20% on the CT scans. (3) Patella alta (Caton-Deschamps) index greater than or equal to 1.2 (24%). (4) Tibial tuberosity-trochlear groove, pathological when greater than or equal to 20 mm (56%). The factors appeared in only 3%-6.5% of the control knees. The etiology of patellar instability is multifactorial. Determination of the factors permits an effective elective therapeutic plan which aims at correcting the anomalies present. |
X Demographics
Geographical breakdown
Country | Count | As % |
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Unknown | 1 | 100% |
Demographic breakdown
Type | Count | As % |
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Members of the public | 1 | 100% |
Mendeley readers
Geographical breakdown
Country | Count | As % |
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Colombia | 1 | <1% |
Germany | 1 | <1% |
Austria | 1 | <1% |
Brazil | 1 | <1% |
Sweden | 1 | <1% |
United Kingdom | 1 | <1% |
Denmark | 1 | <1% |
United States | 1 | <1% |
Unknown | 449 | 98% |
Demographic breakdown
Readers by professional status | Count | As % |
---|---|---|
Researcher | 73 | 16% |
Student > Doctoral Student | 55 | 12% |
Other | 48 | 11% |
Student > Postgraduate | 47 | 10% |
Student > Bachelor | 42 | 9% |
Other | 103 | 23% |
Unknown | 89 | 19% |
Readers by discipline | Count | As % |
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Medicine and Dentistry | 263 | 58% |
Engineering | 19 | 4% |
Nursing and Health Professions | 11 | 2% |
Agricultural and Biological Sciences | 9 | 2% |
Sports and Recreations | 7 | 2% |
Other | 23 | 5% |
Unknown | 125 | 27% |