Thomas R Pfeiffer1, Jeremy M Burnham2, Ajay C Kanakamedala3, Jonathan D Hughes4, Jason Zlotnicki5, Adam Popchak6, Richard E Debski7, Volker Musahl8. 1. Department of Orthopaedic Surgery, Trauma Surgery and Sports Medicine, Cologne Merheim Medical Center, Witten/Herdecke University, 51109, Cologne, Germany. 2. Bone and Joint Clinic of Baton Rouge, 7301 Hennessy Blvd Ste 200, Baton Rouge, LA, 70808, USA. 3. NYU Hospital for Joint Diseases, 301 E 17th St, New York, NY, 10003, USA. 4. Department of Orthopaedic Surgery, Baylor Scott and White Health, 2401 S. 31st, Temple, TX, 76502, USA. 5. Department of Orthopaedic Surgery, Center for Sports Medicine, University of Pittsburgh, 3200 S Water Street, Pittsburgh, PA, 15203, USA. 6. Department of Physical Therapy, University of Pittsburgh, 3200 S Water Street, Pittsburgh, PA, 15203, USA. 7. Department of Orthopaedic Surgery, Orthopaedic Research Laboratories, University of Pittsburgh, 3820 South Water Street, Pittsburgh, PA, 15203, USA. 8. Department of Orthopaedic Surgery, Center for Sports Medicine, University of Pittsburgh, 3200 S Water Street, Pittsburgh, PA, 15203, USA. musahlv@upmc.edu.
Abstract
PURPOSE: Distal femur morphology has been shown to influence knee joint kinematics and may affect rotatory knee laxity. The purpose of this study was to determine the relationship between rotatory knee laxity and distal femoral morphology in patients with complete anterior cruciate ligament (ACL) rupture. It was hypothesized that increased posterior femoral condylar depth on standard lateral radiographs, quantified as the "lateral femoral condyle ratio" would correlate with increased rotatory knee laxity, measured by a quantitative pivot shift test. METHODS: Consecutive patients who underwent ACL reconstruction from 2014 to 2016 were retrospectively reviewed. A standardized pivot shift test was performed preoperatively on both knees and quantified using tablet technology. Using standard lateral radiographs of the knee, the ratio of posterior condylar distance over total condylar distance was defined as the lateral femoral condyle ratio. RESULTS: Data sets were obtained for 57 patients. The mean anterior translation of the lateral knee compartment during a quantitative pivot shift test was found to be 4.0 ± 2.4 mm and 1.3 ± 0.9 mm for the injured and uninjured knees, respectively. The mean lateral femoral condyle ratio on X-ray was 63.2 ± 4.5%. There were significant correlations between the lateral femoral condyle ratio and the absolute quantitative (ρ = 0.370, p < 0.05) and side-to-side differences in anterior translation of the lateral knee compartment (ρ = 0.419, p < 0.05). CONCLUSION: The most important finding from this study is that increased posterior femoral condylar depth, quantified as a lateral femoral condyle ratio, is associated with increased rotatory knee laxity in ACL-deficient patients. This suggests that distal femur morphology may influence rotatory knee laxity. This study may assist clinicians in evaluating ACL injuries and identifying patients at greater risk for persistent increased rotatory knee laxity after ACL reconstruction. LEVEL OF EVIDENCE: III.
PURPOSE: Distal femur morphology has been shown to influence knee joint kinematics and may affect rotatory knee laxity. The purpose of this study was to determine the relationship between rotatory knee laxity and distal femoral morphology in patients with complete anterior cruciate ligament (ACL) rupture. It was hypothesized that increased posterior femoral condylar depth on standard lateral radiographs, quantified as the "lateral femoral condyle ratio" would correlate with increased rotatory knee laxity, measured by a quantitative pivot shift test. METHODS: Consecutive patients who underwent ACL reconstruction from 2014 to 2016 were retrospectively reviewed. A standardized pivot shift test was performed preoperatively on both knees and quantified using tablet technology. Using standard lateral radiographs of the knee, the ratio of posterior condylar distance over total condylar distance was defined as the lateral femoral condyle ratio. RESULTS: Data sets were obtained for 57 patients. The mean anterior translation of the lateral knee compartment during a quantitative pivot shift test was found to be 4.0 ± 2.4 mm and 1.3 ± 0.9 mm for the injured and uninjured knees, respectively. The mean lateral femoral condyle ratio on X-ray was 63.2 ± 4.5%. There were significant correlations between the lateral femoral condyle ratio and the absolute quantitative (ρ = 0.370, p < 0.05) and side-to-side differences in anterior translation of the lateral knee compartment (ρ = 0.419, p < 0.05). CONCLUSION: The most important finding from this study is that increased posterior femoral condylar depth, quantified as a lateral femoral condyle ratio, is associated with increased rotatory knee laxity in ACL-deficientpatients. This suggests that distal femur morphology may influence rotatory knee laxity. This study may assist clinicians in evaluating ACL injuries and identifying patients at greater risk for persistent increased rotatory knee laxity after ACL reconstruction. LEVEL OF EVIDENCE: III.
Authors: Mininder S Kocher; J Richard Steadman; Karen K Briggs; William I Sterett; Richard J Hawkins Journal: Am J Sports Med Date: 2004 Apr-May Impact factor: 6.202
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Authors: Mohammad Hamdan; Bassem Haddad; Mohammad Ali Alshrouf; Muayad I Azzam; Ula Isleem; Reem Hamasha; Omar M Albtoush; Muna Tayel Alhusban; Nidaa Mubarak; Saif Aldeen Alryalat Journal: BMC Sports Sci Med Rehabil Date: 2022-06-02
Authors: Theresa Diermeier; Benjamin B Rothrauff; Lars Engebretsen; Andrew D Lynch; Olufemi R Ayeni; Mark V Paterno; John W Xerogeanes; Freddie H Fu; Jon Karlsson; Volker Musahl; Eleonor Svantesson; Eric Hamrin Senorski; Thomas Rauer; Sean J Meredith Journal: Knee Surg Sports Traumatol Arthrosc Date: 2020-05-09 Impact factor: 4.342
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