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Bone & Joint Open
Vol. 3, Issue 7 | Pages 589 - 595
1 Jul 2022
Joo PY Chen AF Richards J Law TY Taylor K Marchand K Clark G Collopy D Marchand RC Roche M Mont MA Malkani AL


The aim of this study was to report patient and clinical outcomes following robotic-assisted total knee arthroplasty (RA-TKA) at multiple institutions with a minimum two-year follow-up.


This was a multicentre registry study from October 2016 to June 2021 that included 861 primary RA-TKA patients who completed at least one pre- and postoperative patient-reported outcome measure (PROM) questionnaire, including Forgotten Joint Score (FJS), Knee Injury and Osteoarthritis Outcomes Score for Joint Replacement (KOOS JR), and pain out of 100 points. The mean age was 67 years (35 to 86), 452 were male (53%), mean BMI was 31.5 kg/m2 (19 to 58), and 553 (64%) cemented and 308 (36%) cementless implants.

The Bone & Joint Journal
Vol. 99-B, Issue 12 | Pages 1596 - 1602
1 Dec 2017
Dunbar MJ Laende EK Collopy D Richardson CG


Hydroxyapatite coatings for uncemented fixation in total knee arthroplasty can theoretically provide a long-lasting biological interface with the host bone. The objective of this study was to test this hypothesis with propriety hydroxyapatite, peri-apatite, coated tibial components using component migration measured with radiostereometric analysis over two years as an indicator of long-term fixation.

Patients and Methods

A total of 29 patients at two centres received uncemented PA-coated tibial components and were followed for two years with radiostereometric analysis exams to quantify the migration of the component.

The Journal of Bone & Joint Surgery British Volume
Vol. 77-B, Issue 6 | Pages 975 - 976
1 Nov 1995
Collopy D Skirving A

The Journal of Bone & Joint Surgery British Volume
Vol. 75-B, Issue 6 | Pages 914 - 917
1 Nov 1993
Janes G Collopy D Price R Sikorski J

We used dual-energy X-ray absorptiometry (DEXA) to measure the bone mineral content (BMC) of both tibiae in 13 patients who had been treated for a tibial fracture by rigid plate fixation. Within two weeks of plate removal the BMC was significantly greater in the bone that had been under the plate than at the same site in the control tibia. An unplated area of bone near the ankle showed a significant decrease in BMC at the time of plate removal with subsequent return to the level of the control tibia during the ensuing 18 months. We conclude that osteoinductive influences outweigh the potential causes of osteopenia, such as stress shielding and disuse, and that, contrary to expectation, demineralisation is not a factor in the diminished strength of the tibia after plating for fracture.