Several studies have suggested that, in TKR, gender specific-prostheses are needed to accommodate anatomic differences between males and females. This study was performed to examine whether gender is a factor contributing to the variability of the size, shape and orientation of the patellofemoral sulcus. 3D computer models of the femur were reconstructed from CT scans of 20 male and 20 female femora. The patellofemoral groove was quantified by measuring landmarks at 10 degree increments around the epicondylar axis. The orientation of the groove was defined by the tracking path generated by a sphere moving from the top of the groove to the intercondylar notch. To assess the influence of gender on the shape of the distal femur, all morphologic parameters were normalized for differences in bone size. Overall, the distal femur was 15% larger in males compared to females. The male condyles were 4% wider than the female for constant AP depth (p=0.13). When normalized for bone size, there was no gender difference in most patello-femoral dimensions, including the length, width, angle or tilt of the sulcus. Female femora had a less prominent medial anterior ridge (p=0.07), and a larger normalized radius of curvature of the tracking path (p=0.03). In addition, the orientation of the sulcus differed by 1–2 degrees in both the coronal and axial planes. Overall, gender explained 4.7% of the anatomic variation of the parameters examined, varying from 0 to 15.9%. The size, shape and orientation of the patello-femoral groove are highly variable. While the patello-femoral morphology of male and female femora are very similar, some of the anatomic variability is related to gender, particularly the prominence of the medial ridge and the sulcus radius of curvature. The biomechanical and clinical significance of these differences after TKA have yet to be determined.
In Britain 8 million people consult their general practitioner annually with musculoskeletal conditions leading to referral of 1.5 million patients to Orthopaedics/ Rheumatology. Northern Ireland has the highest waiting lists for outpatients in Britain. The demand on orthopaedics continues to rise despite past attempts to reduce waiting lists. Trauma and orthopaedics accounted for 14% of the excess waiters for outpatients at June 2002. (DHSSPS Sept 2002) Roland et al 1991, etc. demonstrated that 43% of all orthopaedic referrals were inappropriate. In Belfast, G.P.s and Physiotherapists in partnership with the Regional Orthopaedic Service decided to pilot a Primary Care Orthopaedic Triage Service. The vast majority of orthopaedic referrals relate to three main body parts: lumbar spine 28%, knees 34% and hips 25% and these were chosen to be triaged for the pilot. Approval was sought and granted from Queen’s University Belfast Ethics Committee. Phase 1 involved the training of 2 GPs and 2 physiotherapists at the Musgrave Park and Royal Victoria Hospital with the full cooperation of the orthopaedic surgeons. Phase 2 tested independently the diagnostic capability of the trained professionals and assessed the appropriateness and management of orthopaedic referrals against the consultants decision as ‘gold standard’. 95 patients participated in the study. 55.8% of referrals were deemed appropriate by the consultants, compared to 44.6% by the GP/physio team. The Kappa statistical score was 0.79 reflecting a good level of agreement and is comparable to other clinical specialties (Sackett 1991). The sensitivity of the trained professionals on orthopaedic referrals was 83% and the specificity was 97%. Kappa value for management of inappropriate referrals was 0.83. Orthopaedic referral can be acceptably triaged by primary care professionals reducing the number of onward referrals to outpatients by 40% and increasing the appropriate referrals from 56% to 97%.
