Henry Conchie1, Damian Clark2, Andrew Metcalfe3, Jonathan Eldridge4, Michael Whitehouse5. 1. Avon Orthopaedic Centre, Southmead Hospital, Southmead Road, Westbury-on-Trym, Bristol BS10 5NB, UK. Electronic address: henryconchie.2011@my.bristol.ac.uk. 2. Avon Orthopaedic Centre, Southmead Hospital, Southmead Road, Westbury-on-Trym, Bristol BS10 5NB, UK. Electronic address: clarkdamian@hotmail.com. 3. Department of Trauma and Orthopaedics, Clinical Trials Unit, Warwick Medical School, Coventry CV4 7AL, UK. Electronic address: a.metcalfe@warwick.ac.uk. 4. Avon Orthopaedic Centre, Southmead Hospital, Southmead Road, Westbury-on-Trym, Bristol BS10 5NB, UK. 5. Avon Orthopaedic Centre, Southmead Hospital, Southmead Road, Westbury-on-Trym, Bristol BS10 5NB, UK; Musculoskeletal Research Unit, Level 1 L&R Building, Southmead Hospital, Southmead Road, Westbury-on-Trym, Bristol BS10 5NB, UK. Electronic address: michael.whitehouse@bristol.ac.uk.
Abstract
BACKGROUND: There is a lack of information about the association between patellofemoral osteoarthritis (PFOA) and both adolescent anterior knee pain (AKP) and previous patellar dislocations. METHODS: This case-control study involved 222 participants from our knee arthroplasty database answering a questionnaire. One hundred and eleven patients suffering from PFOA were 1:1 matched by gender with a unicompartmental tibiofemoral arthritis control group. Multivariate correlation and binary logistic regression analysis were performed, with odds ratios (ORs) and 95% confidence intervals (CIs) calculated. RESULTS: An individual is 7.5 times more likely to develop PFOA if they have suffered from adolescent AKP (OR 7.5, 95% CIs 1.51 to 36.94). Additionally, experiencing a patellar dislocation increases the likelihood of development of PFOA, with an adjusted odds ratio of 3.2 (95% CIs 1.25 to 8.18). A 44-year difference in median age of first dislocation was also observed between the groups. CONCLUSION: This should bring into question the traditional belief that adolescent anterior knee pain is a benign pathology. Patellar dislocation is also a significant risk factor. These patients merit investigation, we encourage clinical acknowledgement of the potential consequences when encountering patients suffering from anterior knee pain or patellar dislocation.
BACKGROUND: There is a lack of information about the association between patellofemoral osteoarthritis (PFOA) and both adolescent anterior knee pain (AKP) and previous patellar dislocations. METHODS: This case-control study involved 222 participants from our knee arthroplasty database answering a questionnaire. One hundred and eleven patients suffering from PFOA were 1:1 matched by gender with a unicompartmental tibiofemoral arthritis control group. Multivariate correlation and binary logistic regression analysis were performed, with odds ratios (ORs) and 95% confidence intervals (CIs) calculated. RESULTS: An individual is 7.5 times more likely to develop PFOA if they have suffered from adolescent AKP (OR 7.5, 95% CIs 1.51 to 36.94). Additionally, experiencing a patellar dislocation increases the likelihood of development of PFOA, with an adjusted odds ratio of 3.2 (95% CIs 1.25 to 8.18). A 44-year difference in median age of first dislocation was also observed between the groups. CONCLUSION: This should bring into question the traditional belief that adolescent anterior knee pain is a benign pathology. Patellar dislocation is also a significant risk factor. These patients merit investigation, we encourage clinical acknowledgement of the potential consequences when encountering patients suffering from anterior knee pain or patellar dislocation.
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