{"id":{"repo_id":"cape-town","oai_identifier":"oai:open.uct.ac.za:11427/33852"},"canonical_url":"https://search.dev.ndltd.org/etd/cape-town/oai:open.uct.ac.za:11427/33852","repository":{"repo_id":"cape-town","name":"University of Cape Town","base_url":"https://open.uct.ac.za/oai/request"},"display":{"title":"Does the Intra-operatively measured Leg Length Correction compare to the Post-operative radiograph in Total Hip Replacement surgery?","abstract":"Aims This study aims to compare the leg length correction (LLC) measured intra-operatively using the Vertical Measurement SystemTM (VMS) in total hip arthroplasty (THA), with the LLC measured on a 6-week post-operative Xray. We also wanted to quantify any residual leg length discrepancy (LLD) using this method. Patients and Methods A prospective cohort study was conducted, in which patients undergoing primary THA were enrolled at two centres in Cape Town, over a period of 19 weeks. THA's were performed by four surgeons. Pre-operative leg length discrepancy measurements were obtained in 92 patients. The VMS was used to predict intra-operative leg length correction (LLC), and this measurement was compared to the post-operative leg length correction measured on the 6-week follow-up X-ray. These measurements were statistically compared using Mann-Whitney U Test. Results The difference between the intra-operative VMS calculation and the 6-week radiological measurement was not significant (p>0.05), with the difference in their mean values being 0.07 ± 3.26mm. In the cohort, 81.52% of the patients (n=75) were within 5mm of the target LLC, and 95.65% of patients (n=88) were within 10mm of the target LLC. The mean absolute residual LLD at 6 weeks was 3.22 ± 3.13mm. Conclusion The intra operative LLC measurement obtained using the VMS accurately predicts the 6-week post op radiographic LLC measurement.","abstract_html":"Aims This study aims to compare the leg length correction (LLC) measured intra-operatively using the Vertical Measurement SystemTM (VMS) in total hip arthroplasty (THA), with the LLC measured on a 6-week post-operative Xray. We also wanted to quantify any residual leg length discrepancy (LLD) using this method. Patients and Methods A prospective cohort study was conducted, in which patients undergoing primary THA were enrolled at two centres in Cape Town, over a period of 19 weeks. THA's were performed by four surgeons. Pre-operative leg length discrepancy measurements were obtained in 92 patients. The VMS was used to predict intra-operative leg length correction (LLC), and this measurement was compared to the post-operative leg length correction measured on the 6-week follow-up X-ray. These measurements were statistically compared using Mann-Whitney U Test. Results The difference between the intra-operative VMS calculation and the 6-week radiological measurement was not significant (p>0.05), with the difference in their mean values being 0.07 ± 3.26mm. In the cohort, 81.52% of the patients (n=75) were within 5mm of the target LLC, and 95.65% of patients (n=88) were within 10mm of the target LLC. The mean absolute residual LLD at 6 weeks was 3.22 ± 3.13mm. Conclusion The intra operative LLC measurement obtained using the VMS accurately predicts the 6-week post op radiographic LLC measurement.","abstract_has_math":false,"creators":["Moonda, Zaheer"],"institution":"Division of General Surgery","degree_name":null,"degree_level":null,"degree_discipline":null,"degree_department":null,"school":null,"contributors":[],"advisors":["Nortjie, Marc"],"committee_chairs":[],"committee_members":[],"year":2021,"date_issued":"2021","date_published":"2021","updated_at":"2026-07-22T22:23:27Z","subjects":["Orthopaedic Surgery"],"languages":[],"rights":[],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/11427/33852","outbound_label":"Handle","outbound_source":"dc:identifier.uri"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor.advisor","label":"Advisor","values":["Nortjie, Marc"]},{"key":"dc:creator","label":"Author","values":["Moonda, Zaheer"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date.accessioned","label":"Dc Date Accessioned","values":["2021-09-13T04:59:24Z"]},{"key":"dc:date.available","label":"Dc Date Available","values":["2021-09-13T04:59:24Z"]},{"key":"dc:date.issued","label":"Date","values":["2021"]},{"key":"dc:publisher.department","label":"Dc Publisher Department","values":["Division of General Surgery"]},{"key":"dc:type","label":"Dc Type","values":["Master Thesis"]},{"key":"dc:type.qualificationlevel","label":"Dc Type Qualificationlevel","values":["Masters","MMed"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Orthopaedic Surgery"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier.uri","label":"Identifier URI","values":["http://hdl.handle.net/11427/33852"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["Aims This study aims to compare the leg length correction (LLC) measured intra-operatively using the Vertical Measurement SystemTM (VMS) in total hip arthroplasty (THA), with the LLC measured on a 6-week post-operative Xray. We also wanted to quantify any residual leg length discrepancy (LLD) using this method. Patients and Methods A prospective cohort study was conducted, in which patients undergoing primary THA were enrolled at two centres in Cape Town, over a period of 19 weeks. THA's were performed by four surgeons. Pre-operative leg length discrepancy measurements were obtained in 92 patients. The VMS was used to predict intra-operative leg length correction (LLC), and this measurement was compared to the post-operative leg length correction measured on the 6-week follow-up X-ray. These measurements were statistically compared using Mann-Whitney U Test. Results The difference between the intra-operative VMS calculation and the 6-week radiological measurement was not significant (p>0.05), with the difference in their mean values being 0.07 ± 3.26mm. In the cohort, 81.52% of the patients (n=75) were within 5mm of the target LLC, and 95.65% of patients (n=88) were within 10mm of the target LLC. The mean absolute residual LLD at 6 weeks was 3.22 ± 3.13mm. Conclusion The intra operative LLC measurement obtained using the VMS accurately predicts the 6-week post op radiographic LLC measurement."]},{"key":"dc:title","label":"Title","values":["Does the Intra-operatively measured Leg Length Correction compare to the Post-operative radiograph in Total Hip Replacement surgery?"]}]}],"canonical_facts":{"dc:contributor.advisor":["Nortjie, Marc"],"dc:creator":["Moonda, Zaheer"],"dc:date.accessioned":["2021-09-13T04:59:24Z"],"dc:date.available":["2021-09-13T04:59:24Z"],"dc:date.issued":["2021"],"dc:description.abstract":["Aims This study aims to compare the leg length correction (LLC) measured intra-operatively using the Vertical Measurement SystemTM (VMS) in total hip arthroplasty (THA), with the LLC measured on a 6-week post-operative Xray. We also wanted to quantify any residual leg length discrepancy (LLD) using this method. Patients and Methods A prospective cohort study was conducted, in which patients undergoing primary THA were enrolled at two centres in Cape Town, over a period of 19 weeks. THA's were performed by four surgeons. Pre-operative leg length discrepancy measurements were obtained in 92 patients. The VMS was used to predict intra-operative leg length correction (LLC), and this measurement was compared to the post-operative leg length correction measured on the 6-week follow-up X-ray. These measurements were statistically compared using Mann-Whitney U Test. Results The difference between the intra-operative VMS calculation and the 6-week radiological measurement was not significant (p>0.05), with the difference in their mean values being 0.07 ± 3.26mm. In the cohort, 81.52% of the patients (n=75) were within 5mm of the target LLC, and 95.65% of patients (n=88) were within 10mm of the target LLC. The mean absolute residual LLD at 6 weeks was 3.22 ± 3.13mm. Conclusion The intra operative LLC measurement obtained using the VMS accurately predicts the 6-week post op radiographic LLC measurement."],"dc:identifier.uri":["http://hdl.handle.net/11427/33852"],"dc:publisher.department":["Division of General Surgery"],"dc:subject":["Orthopaedic Surgery"],"dc:title":["Does the Intra-operatively measured Leg Length Correction compare to the Post-operative radiograph in Total Hip Replacement surgery?"],"dc:type":["Master Thesis"],"dc:type.qualificationlevel":["Masters","MMed"]},"updated_at":"2026-07-22T22:23:27Z"}