Bespoke vs Standard Instrumentation in TKR

Gait of patients will be analysed pre-operatively, six-weeks post-operatively, and 1-year post-operatively by 3D motion capture technology. The change measured over time at 1-year will be the primary outcome.

Patient satisfaction will be reported using a scale on a questionnaire which asks six questions on how happy patients were with their hospital experience/level of pain/functional ability post-operatively. The questionnaire also asks whether their expectations were met. The two satisfaction questions are answered on a scale of 'Very Satisfied/Satisfied/Unsure/Dissatisfied' by ticking the appropriate box. The four questions based on patient expectation are scored on a scale of 'Excellent/Good/Unsure/Poor' by ticking the appropriate box.

A joint specific questionnaire which asks patients on the level of pain and function they believe to have in their affected knee (taking into consideration the past 4 weeks only). The questionnaire consists of 12 questions. Five of the questions are pain related, and seven are aimed at function. Each question has 5 options and is scored from 0-4, with 4 being the best and 0 being the worst pain/function. The best score is therefore 48 (no pain/good function), and the worst score is 0 (pain and poor function).

A joint specific questionnaire which asks patients on the level of pain and function they believe to have in their affected knee (taking into consideration the past 4 weeks only). The questionnaire consists of 12 questions. Five of the questions are pain related, and seven are aimed at function. Each question has 5 options and is scored from 0-4, with 4 being the best and 0 being the worst pain/function. The best score is therefore 48 (no pain/good function), and the worst score is 0 (pain and poor function).

A questionnaire on patients' perception of their overall health. The questionnaire focuses on generic health in 5 dimensions: Mobility, self-care, pain or discomfort, anxiety or depression and usual activities (including work, housework, leisure, family, and study). The questions are scored using an algorithm; the result of which relates to the health status of the patient. This score ranges between 0 (equivalent to death) to 1 (equivalent to full health). It also contains a visual analogue scale where patients have to choose on a scale of 0-100 how well they believe their general health to be on that particular day, where 0 is the worst health imaginable and 100 is the best health imaginable.

A questionnaire on patients' perception of their overall health. The questionnaire focuses on generic health in 5 dimensions: Mobility, self-care, pain or discomfort, anxiety or depression and usual activities (including work, housework, leisure, family, and study). The questions are scored using an algorithm; the result of which relates to the health status of the patient. This score ranges between 0 (equivalent to death) to 1 (equivalent to full health). It also contains a visual analogue scale where patients have to choose on a scale of 0-100 how well they believe their general health to be on that particular day, where 0 is the worst health imaginable and 100 is the best health imaginable.

A general Quality of Life score with 12 questions. It has mental and physical components which are scored from the same questions, using different algorithms. Each question is multiple choice, and the patient must tick one answer. Each answer corresponds to a standardised value, which is used in two algorithms to generate an overall score. One score is for the mental component and one is for the physical component. The physical standardized values are summed across all 12 items. 56.57706 is added to the sum to create the SF-12 physical score. 60.75781 is added to sum create the SF-12 mental score. Higher overall scores are better than lower scores.

A general Quality of Life score with 12 questions. It has mental and physical components which are scored from the same questions, using different algorithms. Each question is multiple choice, and the patient must tick one answer. Each answer corresponds to a standardised value, which is used in two algorithms to generate an overall score. One score is for the mental component and one is for the physical component. The physical standardized values are summed across all 12 items. 56.57706 is added to the sum to create the SF-12 physical score. 60.75781 is added to sum create the SF-12 mental score. Higher overall scores are better than lower scores.

Knee range of motion in degrees will be assessed using a goniometer

Knee range of motion in degrees will be assessed using a goniometer