What the lateral approach actually involves

If your surgeon has mentioned the lateral approach — sometimes called the Hardinge approach, the direct lateral, or the anterolateral approach — these terms all describe the same family of technique. Understanding what it involves helps make sense of the recovery conversation that follows.

For this operation, the patient lies on their side on the operating table. The surgeon makes an incision along the outer part of the thigh, then works down to reach the hip joint. To do that, they need to move aside — or longitudinally split — the front portion of the gluteus medius, the primary muscle that stabilises the pelvis during every step you take. In some cases, the uppermost part of the vastus lateralis, a muscle of the outer thigh, is also moved to improve access to the joint capsule beneath.

Once the capsule is opened, the surgeon can remove the damaged femoral head and prepare both the socket (acetabulum) and the thigh bone (femur) for the new implant components. At the end of the procedure, the divided muscle is carefully repaired back into position.

The lateral approach is one of three dominant routes used in total hip arthroplasty, alongside the posterior approach and the direct anterior approach. For much of modern UK orthopaedic training it was the default technique, and it remains widely practised. That said, practice has gradually shifted toward muscle-sparing routes in recent years, for reasons the following sections explore in detail.

The case for the lateral approach: low dislocation risk

The most compelling argument for choosing the lateral approach is one that matters to patients more than surgeons: a consistently low rate of prosthetic dislocation after surgery.

The reason lies in anatomy. By reaching the hip from the side, the surgeon leaves the posterior capsule — the thick ligamentous sleeve at the back of the joint — completely undisturbed. That intact posterior wall removes the principal anatomical pathway through which a new hip joint can slip out of position. It also gives the surgeon a stable, intact soft-tissue reference during the procedure, which supports accurate positioning of the acetabular cup. A 2006 study by Jolles, now cited more than 320 times in the orthopaedic literature, confirmed that the direct lateral approach facilitates superior cup placement and reduces the risk of sciatic nerve injury compared with the posterior route — both consequences of the same structural advantage.

For most patients this distinction is reassuring but not decisive. Where it becomes clinically meaningful is in specific higher-risk groups: patients with neurological conditions affecting muscle control, those with poor baseline muscle tone or proprioception, and patients who have experienced prior hip instability or a previous dislocation. In these cases, the structural dislocation resistance built into the lateral approach may genuinely outweigh its limitations.

A further practical point is that the lateral approach does not depend on specialist operating tables or fluoroscopy equipment, making it deliverable across a wider range of theatre settings — a logistical factor that still influences how approaches are selected in some centres.

The main trade-off: abductor muscle damage and Trendelenburg gait

The central trade-off of the lateral approach comes down to one muscle: the gluteus medius.

Splitting the front portion of this muscle creates a zone of surgical trauma at the body's primary pelvic stabiliser — the muscle responsible for keeping the pelvis level on every step. If the gluteus medius does not recover fully, or if the superior gluteal nerve (which crosses the operative field and innervates the muscle) is stretched or damaged during the splitting phase, the result is persistent abductor weakness.

The functional consequence has a specific name: Trendelenburg gait. When abductor function is impaired, the pelvis drops toward the non-operated side during single-leg stance on the operated leg — a characteristic hip-dip that physiotherapists recognise immediately and patients often describe as a limp or lurch to one side.

The clinical evidence on how common and how lasting this problem can be is now substantial. A 2021 systematic review and meta-analysis by Ghaddaf, drawing on 16 studies and 16,964 patients — five of them randomised controlled trials — found statistically significantly better abductor strength recovery with the posterior approach than with the lateral (standardised mean difference 0.39, 95% CI 0.14–0.63). Operative time, blood loss, and limb length discrepancy showed no significant difference between the two groups: the measurable disadvantage was specifically one of muscle function.

A longitudinal study by Ismailidis (2021) followed patients across 24 months and found that while abductor strength continued to improve over that period, in a meaningful proportion of patients the deficit had not fully resolved by the two-year mark.

At population level, an NIHR analysis of 723,904 UK hip replacement operations performed between 2003 and 2016 found the lateral approach associated with higher rates of mortality and revision surgery compared with anterior and posterior approaches. The researchers explicitly stated that asking experienced lateral-approach surgeons to change would be unwise, but they did recommend that new surgeons be trained in other techniques as their default — a position that reflects the accumulated direction of the evidence and helps explain why surgical preference has gradually shifted away from this approach.

Lateral vs posterior vs direct anterior: how the approaches compare

The posterior approach — the world's most commonly performed THA technique — reaches the joint from behind, leaving the gluteus medius entirely undisturbed. That structural preservation translates directly to faster gait normalisation and better abductor strength recovery post-operatively, advantages that the meta-analysis evidence addressed in the previous section quantifies in detail. The historical trade-off has been a higher dislocation rate, but contemporary posterior capsular repair techniques have substantially narrowed that gap, making the posterior approach a well-rounded choice for the majority of patients.

The direct anterior approach (DAA) works between natural anatomical tissue planes without cutting through any muscle — a genuinely muscle-sparing route that, for suitable patients, typically produces earlier independent mobility than either the lateral or posterior technique. The restrictions on who qualifies, however, are meaningful. The DAA requires specialist operating table equipment and fluoroscopic guidance; it is poorly suited to patients who are obese or heavily muscled; it carries a risk of lateral femoral cutaneous nerve (LFCN) injury that can leave the front of the thigh numb or uncomfortable; and its learning curve is steep enough that intraoperative femoral fracture during canal preparation is a recognised complication in less experienced hands.

The lateral approach occupies a specific middle ground: structurally more resistant to dislocation than the historical posterior, less demanding in terms of equipment and patient-anatomy restrictions than the anterior, but slower on the abductor-recovery curve than either.

Long-term implant survival is broadly equivalent across all three approaches — published evidence does not support the view that approach choice affects how long the prosthesis lasts. The real differences lie in short-term gait quality, complication profile, and which patients and theatre settings each technique suits best.

Some patients researching the posterior route will encounter SPAIRE — a muscle-sparing posterior variant that preserves the capsule and external rotator tendons alongside the abductors, aiming to reduce dislocation risk without the muscle disruption of the standard posterior technique. It is one option worth raising during a specialist assessment for patients who want to minimise disruption to both soft-tissue layers.

Recovery after lateral hip replacement: timeline and physiotherapy

'When will I walk normally again?' is the question most patients ask first after a lateral hip replacement. For the majority, gait normalises within six to twelve months — but a meaningful minority take longer, and active rehabilitation is what determines which group a patient falls into, not time alone.

The first six weeks after surgery carry standard precautions: no hip flexion beyond 90°, no twisting movements, and no crossing the legs. These restrictions protect both the prosthetic joint and the reattached musculotendinous tissue while initial healing takes place.

Once early mobility is established, the rehabilitation emphasis shifts to conscious muscular retraining. Because the gluteus medius was surgically disrupted to access the joint — unlike in the posterior or direct anterior approaches, where the abductor mechanism is left intact — it does not simply recover through rest. A physiotherapy programme typically progresses from isometric contractions (tensing the muscle without moving the joint) through side-lying hip abduction exercises to progressive weight-bearing gait retraining. Ismailidis (2021) followed patients across 24 months and found that while abductor strength continued to improve throughout, a meaningful proportion had not fully recovered by that point — a finding that makes the quality of the rehabilitation programme, not just its existence, clinically significant.

Objective gait assessment has a useful role here. Tools such as MAI Motion® measure biomechanical firing patterns in real time, capturing subtle deficits that visual observation during a clinic appointment can easily miss — allowing the rehabilitation team to identify plateaus early and adjust the programme accordingly.

Patients considering the lateral approach are well within their rights to ask, before surgery, what the physiotherapy plan looks like and how abductor recovery will be tracked. The answer gives a clear indication of how seriously that team treats the approach's defining recovery challenge.

Who the lateral approach suits — and when to ask about alternatives

Approach selection comes down to matching each technique's specific trade-offs to the individual patient — and the lateral approach remains clinically appropriate for a defined group.

Patients at elevated dislocation risk are its clearest indication: those with neurological conditions or cognitive impairment that may affect compliance with post-operative precautions, anyone with a history of prior hip instability, and patients undergoing revision surgery where altered anatomy adds technical complexity. For these individuals, the lateral approach's structural protection of the posterior capsule represents a meaningful clinical advantage rather than surgical convention.

Patients who are younger, more active, or strongly motivated to return to normal gait quickly may find the balance of current evidence points more favourably toward a posterior or direct anterior approach — both of which leave the abductor mechanism intact and allow faster strength recovery. Body habitus, surgeon training, and theatre equipment availability all contribute to what is technically feasible in a given case; a surgeon's personal complication profile with their preferred technique carries at least as much weight as population-level approach comparisons.

For patients interested in minimising soft-tissue disruption more broadly — preserving not just the abductors but the capsule and external rotator tendons alongside them — a muscle-sparing posterior approach such as SPAIRE is worth exploring. Consultant-led assessment at Hip Replacement Lincolnshire, informed by Prof Paul Lee's clinical framework for approach selection, works through these options relative to each patient's anatomy, activity goals, and risk profile. The service accepts patients without GP referral (hipreplacementlincolnshire.co.uk).

Three questions are worth raising with any surgeon before agreeing to an approach: what technique is planned and why for this specific anatomy? What is the surgeon's own dislocation and revision rate with it? And have alternatives been considered given your activity level, body type, and recovery priorities?